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I2773-4.

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Somat eDAQ

lite

14 Data Synchronization

This section describes the limitations on the synchronization of the data samples.
eDAQ

lite

data acquisition synchronization across channels is accomplished by using

a single master clock source that drives the data acquisition hardware. The term lag
indicates that, in a Time History plot, the data appears later than it should while the
term lead indicates that the data appears earlier than it should.

NOTE

Unless otherwise noted, the following discussion and numerical examples assume a
100000 Hz master clock rate.

14.1

Data Synchronization Characterization Method

To characterize eDAQ

lite

data synchronization, a ±5000-millivolt triangle function

generator waveform is fed in parallel into all channels to be characterized. The
frequency of the waveform is set at the sample rate divided by 1000 to yield 1000
sample points per cycle. For each reversal, all data samples that fall between ±2000
millivolts are least squares fit to provide a very accurate measurement of the zero
crossing time. The differences in these zero crossing times from one channel to the
next represent the data skew from one channel to the next. For each test run, the data
skew on at least 200 consecutive reversals is measured and then averaged. At least
3 test runs are performed and the average data skew over the set of test runs is the
characterized data skew value.

14.2

Analog Channel Synchronization

The ELHLS and ELBRG channels all employ pre-start periods to compensate for their
analog guard filters. In addition to the guard filter skew, there are some other
secondary factors that influence data synchronization, such as A/D converter
conversion time and transport delays through gain amplifiers.

NOTE

This discussion assumes no digital filtering. Ideally, linear phase digital filters do not
result in phase shifts. For the ELHLS and ELBRG channels, however, the linear phase
filters for sample rates at or below 10000 Hz result in a five microsecond lead data
skew. The Butterworth digital filters are designed to match their analog equivalents
and, therefore, these filters do generate significant phase shifts which, in turn,
significantly affect synchronization with other transducer channels.

Following is a table that contains actual data skew characterization test results (in
microseconds) for one eDAQ

lite

stack. The data in this table is consistent with the

data skew times discussed in this section. The first channel on the first ELHLS layer
was arbitrarily used as the data sync time reference channel. The test covered the
channels on two ELHLS layers and the channels on one ELBRG layer. The data sync
was characterized using three different sample rates for both the 100 kHz and the
98.304 kHz master sample rates.

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Summary of Contents for eDAQlite

Page 1: ...User Manual English Deutsch Espanol I2773 4 4 en HBM public Somat eDAQlite with TCE Software ...

Page 2: ...Somat eDAQlite 2 I2773 4 4 en HBM public ...

Page 3: ...liar with the eDAQlite System 19 1 3 3 Setting Up the eDAQlite 20 1 4 Test Process 21 2 Using the eDAQlite 23 2 1 eDAQlite Base System 23 2 1 1 Status LEDs 23 2 1 2 eDAQlite Layers 24 2 1 3 Updating Firmware 27 2 2 Communications 28 2 2 1 Communications Methods 28 2 2 2 Changing the eDAQlite IP Address and Host Name 29 2 3 Power Considerations 30 2 3 1 Input Power Voltage 31 2 3 2 Battery Power 32...

Page 4: ...ull Down Menus 44 3 1 3 Toolbar 48 3 1 4 Status Bar 49 3 2 TCE Preferences 49 3 2 1 Communications 50 3 2 2 General 50 3 2 3 FCS Specific 52 3 2 4 Remote Test Run Control 54 3 2 5 Scope and Spectrum Display 56 3 2 6 Run Time Display 56 3 2 7 Group DVM Display 57 3 2 8 Auto Range Options 57 4 Using TCE 59 4 1 Defining a Test 59 4 1 1 Adding a Network Node 59 4 1 2 Configuring the Hardware 60 4 1 3 ...

Page 5: ...teractive Triggers 71 4 3 6 Stopping a Test Run 71 4 3 7 Ending a Test 71 4 4 Monitoring Test Status 71 4 5 Viewing Channel Displays 72 4 5 1 Displays Overview 73 4 5 2 Common Display Options 74 4 5 3 DVM 75 4 5 4 Scope Plot 77 4 5 5 Spectrum Plot 78 4 5 6 Digital Readout 79 4 5 7 Bar Chart 80 4 5 8 Strip Chart 81 4 6 Uploading Test Data 82 4 6 1 Uploading SIE Data Files 82 4 6 2 Uploading SIF Dat...

Page 6: ... Output Layer 91 5 3 1 ELDIO Available Inputs and Outputs 91 5 3 2 ELDIO Configuration Options 92 5 4 ELBRG Bridge Layer 94 5 5 ELHLS High Level Analog Layer 95 5 6 ELNTB Non Isolated Thermocouple Layer 95 5 7 EGPS 5HZ Somat GPS Receiver 96 5 7 1 Available Inputs 97 5 7 2 Configuration Options 97 5 8 EGPS 200 Precision GPS Module 97 5 8 1 Available Inputs 98 5 8 2 Configuration Options 98 5 9 Vehi...

Page 7: ...le 108 6 1 6 Prerun Rezero 109 6 1 7 Display Control 110 6 2 Digital Input Channels 110 6 2 1 Digital Input 110 6 2 2 Pulse Counter 111 6 3 Analog Input Channels 113 6 3 1 Bridge 113 6 3 2 Simultaneous High Level 116 6 4 SMART Module Input Channels 118 6 4 1 SMSTRB4 Strain SMART Module 118 6 4 2 SMITC Thermocouple SMART Module 121 6 5 Temperature Input Channels 121 6 5 1 Thermocouple 121 6 6 Bus O...

Page 8: ...Integer Scaler 133 7 2 4 Integrator 134 7 2 5 Pulse Counter 136 7 2 6 Directional Velocity 137 7 2 7 State Mapper 138 7 2 8 Statistical Analysis 139 7 2 9 Damage Equivalent Load 141 7 2 10 Fatigue Damage 142 7 3 Triggering Computed Channels 145 7 3 1 Interactive Trigger 145 7 3 2 Trigger Generator 145 7 3 3 Timed Trigger 146 7 3 4 Triggered Zero Suppression 147 7 3 5 Bitmap Trigger 148 7 3 6 Test ...

Page 9: ...d Latch 158 7 5 7 Valid Data Gate 160 8 DataModes 161 8 1 DataMode Memory Consumption 161 8 2 Common DataMode Parameters 161 8 3 Sequential DataModes 163 8 3 1 Time History 163 8 3 2 Burst History 164 8 3 3 Event Slice 167 8 3 4 Message Logger 168 8 3 5 Peak Valley 168 8 3 6 Peak Valley Slice 169 8 4 Histogram DataModes 170 8 4 1 Common Histogram Parameters 170 8 4 2 Peak Valley Matrix 171 8 4 3 R...

Page 10: ...e Table 178 9 3 2 Manage Network Cameras 179 9 3 3 Select Storage Device 180 9 4 Channels Tab 180 9 5 Test Tab 180 9 6 Data Tab 181 9 6 1 SIE Test Data 181 9 6 2 SIF Test Data 182 9 7 Custom Tab 182 9 8 Help Tab 182 10 Troubleshooting 183 10 1 Troubleshooting Procedure 183 10 2 Known Problems 184 10 3 eDAQlite Flags 184 10 3 1 Status Flags 184 10 3 2 Error Flags 186 10 4 Corrupt SIF File Data Reco...

Page 11: ...Cable for J1708 Interface 200 12 6 3 Transducer Cable for CAN SWC Interface 200 12 6 4 Transducer Cable for ISO9141 KW2000 Interface 201 12 6 5 Transducer Cable for MIL1553 Interface 201 13 Device Wiring 203 13 1 ELDIO Digital I O Layer 203 13 1 1 ELDIO Digital Input 203 13 1 2 ELDIO Digital Output 204 13 2 ELHLS High Level Analog Layer 205 13 2 1 ELHLS Analog Input 205 13 2 2 SMSTRB4 Strain SMART...

Page 12: ...eDAQlite eDAQ System Synchronization 212 14 5 1 Hardwired Network Synchronization 212 14 5 2 Wireless Network Synchronization 212 15 Digital Filtering 213 15 1 Signal Aliasing 213 15 2 Digital Filter Characteristics 213 15 2 1 ELHLS and ELBRG Digital Filters 214 16 Xth Percentile Benchmark Tests 219 17 Data Processing Algorithms 221 17 1 Peak Valley Processing Algorithm 221 17 2 Rainflow Cycle Cou...

Page 13: ...o ensure safe operation the transducer may only be used as specified in the operating manual It is also essential to follow the respective legal and safety regulations for the application concerned during use The same applies to the use of accessories Each time before starting up the equipment you must first run a project planning and risk analysis that takes into account all the safety aspects of...

Page 14: ...Maximum danger level Warns of an imminently dangerous situation in which failure to comply with safety requirements will result in death or serious bodily injury WARNING Meaning Dangerous situation Warns of a potentially dangerous situation in which failure to comply with safety requirements can result in death or serious bodily injury CAUTION Meaning Potentially dangerous situation Warns of a pot...

Page 15: ...in the possibilities documented in the manuals Qualified personnel The equipment may be used by qualified personnel only the specifications and the special safety regulations need to be followed in all cases This means people who meet at least one of the three following requirements Knowledge of the safety concepts of automation technology is a requirement and as project personnel you must be fami...

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Page 17: ... base processor 1 2 Equipment This section describes the provided equipment and the support equipment necessary to set up the eDAQlite system and run a test 1 2 1 Provided Equipment The initial shipment of a basic eDAQlite contains the hardware listed below additional hardware may be included based on options ordered The eDAQlite also comes with Somat Test Control Environment TCE software NOTE If ...

Page 18: ...uirements for TCE to operate correctly Microsoft Windows 95 98 NT 2000 XP Vista 7 40 MB of available hard disk space CD ROM drive or Internet access required for updating and installing software 16 MB of RAM 32 MB recommended Mouse or other pointing device An Ethernet card Sensors The eDAQlite supports a wide variety of sensors for data acquisition including several offered directly by HBM Contact...

Page 19: ...fault folder name to the common folder name previously C Program Files Somat Tce_eDAQ during the installation process To keep TCE preference settings be sure to save the TceMS ini file before uninstalling the previous version of TCE Default Working Directory Effective starting with TCE 3 15 the TCE working directory now defaults to a subfolder in the Documents or My Documents directory named Somat...

Page 20: ...e RJ 45 connector either directly to the PC or to an Ethernet hub depending on the communications table For serial communication connect the 9 pin D Sub connector directly to the PC The serial connection may be removed once the setup process is complete but it may be helpful in network setup should difficulties arise with Ethernet communication 2 Connect the appropriate cable s to the eDAQlite for...

Page 21: ...ired for the test This includes attaching the transducers to the components being measured connecting the transducer cables to the transducer and connecting the transducer cables to the appropriate eDAQlite connectors Define Test The eDAQlite collects data from transducers and other input sources manipulates the signals using computed channels and stores the data in a variety of DataModes Use the ...

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Page 23: ...rrupted in the serial loader which should not happen accidentally Possible States After all three LEDs are on the main processor boot up begins The LED states that can exist after the boot up starts are defined as follows OO 55 5VCVWU U Red Yellow Green Description 4 Hz Off Off Bus pins misaligned 4 Hz 4 Hz Off Blown fuse On On Off Power supply failure or voltages not stabilized On On On No proble...

Page 24: ... the layer address using the jumpers For more information on eDAQlite layer addresses see Layer Addressing on page 25 6 Press the layer and ring onto the eDAQlite stack Use care not to put undue strain on the layer Repeat for each layer as necessary until all layers are attached NOTE One O ring or gasket must be present under each layer and top lid Newer CE compliant layers contain an O ring insta...

Page 25: ...ion consists of two associated pins labeled 1 2 3 4 or 5 6 where pins 1 2 represent the least significant digit and pins 5 6 represent the most significant in a three digit binary number A jumpered pair results in a logical 0 An illustration of all possible logical addresses follows Figure 2 1 Possible jumper configurations for addressing eDAQlite layers All layer address jumper sets are on the si...

Page 26: ...LCPU layer Each add on layer must have a unique address An eDAQlite stack may have a maximum of eight add on layers not accounting for power and temperature limitations NOTE For eDAQlite stacks with more than one ELDIO layer any ELDIO layer with a GPS module must have a lower layer address than all ELDIO layers without a GPS module Stacking Order There are hardware IDs associated with each layer a...

Page 27: ...y the first two numbers of the eDAQlite and TCE version numbers must be identical e g 3 11 After running the installer on the support PC to copy the files to the Somat directory follow the steps below to upgrade the eDAQlite firmware Always update the ELCPU firmware before updating any layer level firmware CAUTION If updating from an earlier release version do not attempt to perform the upgrade if...

Page 28: ... are required cycle the power on the eDAQlite to complete the overall firmware update process NOTE For more detailed procedures for each layer type and a listing of the current layer level firmware versions see the instructions for installing eDAQlite firmware provided with the firmware installation 2 2 Communications 2 2 1 Communications Methods Ethernet Communications Connect the eDAQlite to the...

Page 29: ... host name using an Ethernet connection 1 Open a web browser on the support PC 2 Enter the IP address of the eDAQlite in the address field The default IP address programmed into the eDAQlite nonvolatile memory during production is noted on a tag attached to the eDAQlite typically 192 168 100 100 NOTE The support PC must be configured to be able to reach 192 168 100 100 from the Ethernet port on th...

Page 30: ...way Each has a separate prompt with the current default value appearing in brackets after the description Enter the new value or press enter to accept the existing value for each of the four parameters 6 After entering all the parameters enter y to confirm the settings or n to cancel 7 Reboot the eDAQlite to complete the procedure and allow the modifications to take effect NOTE For complete access...

Page 31: ...ernal battery until the input voltage returns to ten volts or more If the input voltage drops below six volts or the eDAQlite detects that the internal battery has limited remaining life the eDAQlite performs an orderly power shut down When input power voltage is restored to ten volts or more the eDAQlite reboots and continues operation A fully charged internal backup battery contains enough reser...

Page 32: ...ates on an as needed basis An intelligent charge controller monitors current into and out of the backup battery tracking the current charge state of the battery When the battery has discharged to about 92 of rated capacity and the eDAQlite is connected to a power supply at more than ten volts the charger turns on and runs until fully charged normally a process of about 20 to 30 minutes An eDAQlite...

Page 33: ... as this drains the backup battery and can result in SIF data corruption 2 3 4 Power Save Mode NOTE The power save mode is provided for limited testing applications Please read this section completely to fully understand the repercussions of using this operational mode When power save mode is enabled the eDAQ turns off analog power to all ELHLS and ELBRG layers after a test run stops reducing its ...

Page 34: ...stabilize before being applied to the transducer Even with a two second delay some ICP accelerometer channel data may have small offsets such as having data values of around 0 1 g or more over a long term test with the accelerometer at rest Because the amount of the offset depends on the specifics of the ICP accelerometer it is recommended that tests be performed to quantify such offsets 2 3 5 Pow...

Page 35: ...ecommended and cannot be guaranteed as safe Results may include unwanted multiple runs of data improper reboots lost data due to multiple power cycles and improper charging of the internal battery pack Figure 2 3 Alternate vehicle battery connection for non switching battery to ground 8GJKENG CVVGT 8GJKENG HKTGYCNN 8 8 DNCEM TGF 4GOQVG 2QYGT 8 8 DNCEM TGF CKP 2QYGT G 3 5 294 2QYGT 8GJKENG CVVGT 8G...

Page 36: ...ay result in blown fuses and or permanent damage to the eDAQlite Improper powering of the unit requiring repairs by HBM technicians may be deemed as non warranty usage resulting in service charges Figure 2 4 Vehicle battery connection for switching battery to ground The figure below shows an example of improper powering that may result in a short and damage the eDAQlite 8GJKENG CVVGT 8GJKENG HKTGY...

Page 37: ...d to as SIC files using a fixed naming convention i e sif00000 sic sif00001 sic sif00002 sic etc To view these 8GJKENG CVVGT 8GJKENG HKTGYCNN 8 8 DNCEM TGF 4GOQVG 2QYGT 8 8 DNCEM TGF CKP 2QYGT G 3 5 294 2QYGT 8GJKENG HKTGYCNN 8 DNCEM QYGT C 5 2 SIE SIF Unlimited file size Files limited to slightly less than 4 GB eDAQlite can store multiple data files eDAQlite can only store one data file Data is r...

Page 38: ... memory This section of DRAM memory is copied to the internal CompactFlash card on power downs or error resets and then copied back to DRAM on boot up NOTE The SIE format does not support data collection to the RAM Disk Regardless of the data storage setting SIE data is saved to the storage device selected in the web interface DRAM Memory The amount of DRAM memory available for data storage is dep...

Page 39: ...ormation on using TCE to manage an eDAQlite eDAQ network see Networking eDAQlite eDAQ Systems on page 86 Required Hardware For n eDAQlite eDAQ systems the following hardware is required and assumes Ethernet communications mode A hardwired network consists of one master eDAQlite eDAQ and n 1 slave units n Networking Adapter Cables 1 SAC ESYNCADAPT 2 n 1 Networking Sync Cables 1 SAC ESYNC 2 2 Networ...

Page 40: ...nable GPS clock generation see ELDIO Configuration Options on page 92 and define at least one GPS channel in the test setup see Bus Oriented Input Channels on page 121 The test run start time is required to align the data acquired from different eDAQlite eDAQ units The eDAQlite logs the start time in terms of GPS time in the data file under the global keyword DF_GPSStartRunTime_ where is the run n...

Page 41: ...listed tasks and more see Using TCE on page 59 3 1 TCE User Interface The following sections describe the TCE user interface including the setup windows pull down menus toolbar and status bar 3 1 1 Setup Windows Create and modify TCE files using the five setup windows Access any of the button options in the windows using the mouse or the keyboard entry indicated by the underlined character For exa...

Page 42: ...ect configuration details Option Description Edit ID Modify the test identification information shown in the upper window Import Import a network node definition from an existing TCE setup file TCE also imports all hardware modules transducer and computed channels and DataModes associated with the network node Add Add a network node to the existing TCE setup file Specify an IP address or host name...

Page 43: ...rt the transducer channels list alphabetically by connector ID DVM Run a DVM display for the selected transducer channels This option is not available when a test is initialized For more information on the DVM display see DVM on page 75 Scope Run the scope display for the selected transducer channel The scope display is limited to a single channel This option is not available when a test is initia...

Page 44: ... this document for more information on the menu command NOTE To perform any tasks in the FCS Setup menu the PC must be connected to the eDAQlite specified in the TCE communications preferences Option Description Add Add a new computed channel definition to the setup TCE adds the new computed channel above the selected entry Del Delete the selected computed channels Edit Modify the selected compute...

Page 45: ...elimited Generate a tab delimited text file of current hardware setup Provided primarily for HBM internal use Open SIE or SIF File Extract keyword and message channel data from an existing SIE or SIF file 4 6 3 Consolidate SIC Files Generate a complete SIF file from a set of SIF component files SIC files Call Infield EASE DataXplorer CTRL D Start InField EASE or DataXplorer for displaying and or a...

Page 46: ...alibration resistors during a test run Interactive Triggering CTRL 4 Open a dialog to control the values of the eight available interactive triggers 4 3 5 Run Time Display CTRL 5 Open the run time display window 4 5 Stop Run CTRL 6 Stop a test run 4 3 6 End Test CTRL E End the current test run 4 3 7 Auto Range Options Configure the option to automatically use the minimum and maximum values recorde...

Page 47: ...ion if there is no test initialized on the eDAQlite and all test data has been safely uploaded from the eDAQlite Format RAM Disk Format the RAM disk on the eDAQlite unit and erase all files including some test data files from the RAM disk This option is available at all times even while a test is running Because the eDAQlite formats the RAM disk in the normal process of test initialization formatt...

Page 48: ...open windows Arrange Icons Arrange all minimized windows at the bottom of TCE Close All Close all windows Next Window Activate next window Previous Window Activate previous window Toggle Maximized Maximize or restore active window Help Contents Ctrl H Open the table of contents for the contextual help system This help can also be accessed from various TCE windows Note that if using Windows 7 or Wi...

Page 49: ... Modified The test modified section indicates by displaying the word Modified that the current test setup has been modified from its last saved state General Information The general information indicator provides TCE status information with a brief description of the current action or the action just completed 3 2 TCE Preferences The TCE Preferences menu provides a variety of options to modify som...

Page 50: ... 3 2 2 General Descriptions not IDs for data file plot labels Store the TCE channel description fields in the data file for use as labels on plot windows When selected empty or duplicate channel descriptions prompt warnings from TCE Modifying this option is not available after test initialization NOTE Although TCE description fields allow 63 characters data file labels are limited to 31 characters...

Page 51: ...rence on TCE setup file open When opening a TCE setup file automatically set the current communication preferences If the existing preference matches any network node defined in the opened file the preference remains unchanged Otherwise TCE sets the active eDAQlite to the master network node or if no master exists the first defined network node Warn user if Warn user about unused channels Select o...

Page 52: ... there are a large number of channels defined at lower sample rates 500 Hz Using the lowest pipe frame rate also modestly improves throughput performance for most tests with sample rates below 10000 Hz At sample rates above 10000 Hz a higher pipe frame rate generally results in the best throughput performance Because TCE run time displays run at the pipe frame rate higher pipe frame rates may be d...

Page 53: ...mance but it is required to support TCE auto range functionality For more information on auto range options see Auto Range Options on page 57 Option Description SIE delete old SIE files on test init Collect data in the SIE file format and limit the number of SIE files on the eDAQlite to one emulating the behavior of SIF files SIE Collect data in the SIE file format and allow multiple SIE files on ...

Page 54: ...onfigure the eDAQlite for remote control of test runs using digital input and output lines The eDAQlite uses the digital input and output lines on the lowest addressed ELDIO layer for remote control operation After selecting Remote Test Run Control from the Preferences menu choose the eDAQlite option to modify the following preferences For more information remote test control see Using Remote Cont...

Page 55: ...puts are always available but cannot be assigned to any bits used for remote control outputs Option Description Disable Do not use remote control Enable Use remote control for all subsequent tests Query Choose whether to use remote control at each test initialization Output Description Running Indicates the test running state Flashing indicates running steady on indicates starting or stopping a ru...

Page 56: ...n value Start the display showing the prerun value when present This option is only applicable to the scope displays 3 2 6 Run Time Display Use the run time display preferences to set a default run time display type and configure display options for the bar and strip chart display For more information on run time displays see Viewing Channel Displays on page 72 Display mode Select the preferred di...

Page 57: ...e sorted in the order of full scale saturation percent i e how close the channel is to either of the user defined full scale limits This option is available whenever the SIE or SIF data file is resident in the eDAQlite Option Description Normal The signal trace begins again at the left side of the plot Scroll The signal trace scrolls continuously to the left at the rate at which data is received a...

Page 58: ...ull scale definition Auto Set Select the auto set option to apply the defined auto range parameters to the selected set of channels TCE updates the list box This option can be used as often as necessary to assign different subsets of channels different auto range parameters Save TCE Setup Select this option to compute the new full scale settings and save them in a new TCE setup file TCE asks for t...

Page 59: ... its communications and network configuration select Add in the test ID network node window For a single eDAQlite test add one network node For a set of networked eDAQlite eDAQ systems add a network node for each eDAQlite eDAQ in the test NOTE If using only a single eDAQlite this step is optional A hardware query updates all required fields in the network node setup according to the current commun...

Page 60: ...configuration differs from the current hardware setup choose to update the list or abort the query when prompted TCE also issues an alert for any flags set by the eDAQlite since the last query The Query option is only available when an eDAQlite is connected to the support PC To manually add eDAQlite hardware click Add in the hardware setup window Use this method to define a complete eDAQlite syste...

Page 61: ...TE Serial bus configuration settings are only available when a custom module is installed using the web interface For detailed instructions on installing several different custom modules see the installation instructions provided with the firmware installation Hardware with viewable characterization details only ELBRG ELHLS Network camera 4 1 3 Creating Channels and DataModes Adding Channels and D...

Page 62: ...from existing setup and data files These include simply opening and modifying a previously saved test setup extracting setup and supporting files from a SIE or SIF data file and importing defined network nodes Modifying an Existing Test Opening and modifying an existing test setup file is probably the most common mode of defining test after creating an initial test from scratch To open a previousl...

Page 63: ...file from a SIE or SIF data file select Open SIE or SIF File from the File menu After choosing the desired data file select Keyword Extraction Options and then TCE Setup File to PC File Save the file and open it in TCE as any other previously saved setup file 4 2 Calibrating Input Channels Transducer calibration for the eDAQlite system is independent of a specific signal conditioner or hardware la...

Page 64: ... the following definitions Defined Value Eng Units 0 RPM Sig Units 0 Hz Defined Span Eng Units 60 RPM Sig Units 180 Hz Shunt Span Modes Low level signal conditioner transducers ELBRG and Strain SMART Module offer additional mode options These modes are all based on an internally applied shunt resistor to simulate strain or load Cal Mode Description External Value Define a single point on the calib...

Page 65: ...esistors are installed or removed sequentially from one network node to the next NOTE Although this task requires a fairly small amount of eDAQlite processing it can result in a DeviceOverFlow error reset for tests running at the edge of the eDAQlite processing limit An internal shunt resistor applied across the Ex to Sig leg of the bridge results in a downscale shunt In other words the voltage ou...

Page 66: ...f the active strain gage and bridge factor for the bridge configuration defined with the channel parameters Select the desired calibration step definition based on the strain values expected in the field The shunt tool assumes that the engineering units are microstrain If using dimensionless strain units divide the equivalent strain value by 1000000 The equivalent strain uses the following equatio...

Page 67: ...erformed For one channel the calibration check window shows the maximum deviation and the defined and measured calibration values For two or more channels the summary window shows each channel s maximum deviation in both engineering units and percentage of full scale range Click the More Info button to show the calibration check window for the highlighted channel NOTE The calibration check does no...

Page 68: ...s possible The eDAQlite acquires one A D sample to determine the signal voltage of the input channel High Level Channels For most high level input channels i e pulse counter vehicle bus serial bus and GPS input channels the eDAQlite acquires a set of data samples at the user specified sample rate and averages these to provide a single signal value for calibration purposes If the sample rate is 50 ...

Page 69: ...port PC within the user specified tolerance Purge the eDAQlite RAM disk and PC Card removing previous test setup and SIF data files Transfer the required test setup files to the eDAQlite Set up the eDAQlite signal conditioner excitation circuits allowing the maximum time for the excitation circuits to stabilize before the test run starts Create the data file and write some of the header fields For...

Page 70: ...nnels and computed channels run in preview mode just as they would during a data collection run To start a preview run select Preview Run from the Test Control menu or toolbar 4 3 4 Starting a Test Run To start a test run select Start Run from the Test Control menu or toolbar The Somat eDAQlite supports multiple test runs for an initialized test Start a new test run anytime after a previous run st...

Page 71: ...or a FALSE state use the invert trigger parameter in the Interactive Trigger computed channel For more information on the Interactive Trigger computed channel see Interactive Trigger on page 145 NOTE The eDAQlite maintains the trigger states through power fail or error reset test run restarts 4 3 6 Stopping a Test Run Manually stop the current test run by selecting Stop Run from the Test Control m...

Page 72: ...es Origin Indicates the original TCE name of the current test setup file Setup Indicates the eDAQlite reference name of the current test setup file Data Indicates the name of the current SIF data file Note that even when using only SIE data the eDAQlite retains a very small RAM disk based SIF file for internal purposes RAM Disk Memory in bytes and percent total of RAM disk memory Total Indicates t...

Page 73: ...es are available as prerun options after initialization and before the first test run or between test runs To access the displays select Transducer Checks from the Prerun Options sub menu of the Test Control menu Run Time Run time displays show the raw signals from input and computed channels on a real time basis providing verification that input and computed channels are functioning properly Run ...

Page 74: ...ad and can result in a DeviceOverFlow error reset for tests running at the edge of the eDAQlite processing limit Minimum and maximum values are not time stamped and the TCE polling loop results in reads that are only approximately equally spaced in time When using PC Card data storage the time interval between TCE polls is typically more erratic The min max display mode can only be used with one a...

Page 75: ...mat The DVM is available pre initialization and as a prerun option TCE presents the DVM display window differently for a single channel and a group of channels Figure 4 2 A TCE DVM signal display for a single channel View Mode Description Scan Update data in the display as it is received Hold Do not update the display For some displays the Hold mode allows access to certain display options Units D...

Page 76: ...e the rate at which TCE updates the display NOTE A DVM for a single digital input channel offers the option to read bits When using this option the eDAQlite reads the current state of the digital input line and TCE displays a check when the line is high i e logical TRUE or no check when the line is low i e logical FALSE HBM public ...

Page 77: ...nformation on scope plot display preferences see Scope and Spectrum Display on page 56 Figure 4 4 A TCE scope plot as a run time display Samples Select the desired number of samples to display on each scope scan Auto Scale Select the auto scale option to switch to automatic y axis scaling mode which sets the y axis limits to the maximum and minimum values in the data set for each scope scan Grid L...

Page 78: ...Samples Select the desired number of samples used in the FFT algorithm to generate the frequency spectrum Grid Lines Select the grid lines option to add grid lines to the spectrum display The grid lines divide the x axis into 10 equal parts and the y axis on a log scale in decades Half Life Select the desired half life value The spectrum half life specifies the amount of old data to combine with t...

Page 79: ...imum and maximum values from the latest reading The since reset min and max columns show the overall minimum and maximum values since the start of the display or the last reset The digital readout is available as a run time display only Figure 4 6 A TCE digital readout run time display Reset Click the Reset button or use the ALT R keyboard shortcut to reset the tracking and display of the overall ...

Page 80: ... show the overall minimum and maximum values since the start of the display or the last reset The FS min and max columns display the full scale values defined for the channel The bar chart is available as a run time display only For more information on bar chart display preferences see Run Time Display on page 56 Figure 4 7 A TCE bar chart run time display Reset Click the Reset button or use the A...

Page 81: ...rip chart display preferences see Run Time Display on page 56 NOTE The x axis of the strip chart is not a linear time base The display update period is determined by the processing time required plus a built in delay Actions such as changing the plot mode or placing the display on hold significantly affects the update period In steady state operation the x axis is usually a good approximation of a...

Page 82: ...u or toolbar If using RAM disk storage TCE uploads the SIF file directly to the PC file If the PC Card data storage option is in use the eDAQlite first consolidates the SIF data file from the RAM disk resident component file and the set of PC Card resident component files A test run cannot be in progress to upload a SIF data file Upload SIF data after a test run or after ending a test The upload o...

Page 83: ...typically execute significantly faster using fully demultiplexed data records Select one of the following options to access additional test and eDAQlite information Keyword Extraction Options The keyword extraction options provide the opportunity to extract some of the global keyword data sets that are embedded in the SIE or SIF data file To access an available option select the corresponding radi...

Page 84: ...a PC file The run number index starts from 1 The first line of the file specifies the run number The following lines contain the transducer channel ID and the zero offset value in engineering units There is one line for every transducer channel that can be rezeroed The offset value is the amount the transducer has been rezero offset since the test was first initialized For more information see Rez...

Page 85: ...rizes the channel list with presentation of some of the channel header information combined with a small amount of the actual data for each channel This option is provided primarily for troubleshooting corrupt SIF data files 4 7 Using Remote Control Operation Start and stop test runs remotely using the remote control operational mode The remote control mode uses digital I O lines for control input...

Page 86: ...els and DataModes for the test in the same manner as for a single eDAQlite Multiple channel interactive setup tasks such as the group DVM display and parallel transducer calibrations require that the channel set reside on a individual network node However most non interactive features e g group edits and group deletions are supported across network nodes With the test setup definition completed an...

Page 87: ...s long as the remote control is not suspended Because of this be careful to not start the master until the slaves are all running and waiting for the master to assert the MSR clock source The green and yellow front panel LEDs blink in unison when the slave is in this ready state Failure to do this prevents synchronization of the slave and master data The automatic test runs prevent normal actions ...

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Page 89: ...LCPU PLUS or ELCPU layer including the 9 pin D Sub Comm port used for serial bus inputs Serial Bus The RS232 serial port can be configured as a data input port to acquire serial data streams from various sources Specialized code must be written to deal with the specifics of the particular serial data streams Therefore serial data sources are supported on a custom basis for such things as serial GP...

Page 90: ...se TCE run time displays run at the pipe frame rate higher pipe frame rates may be desired NOTE Select the default preference for the pipe frame rate using the FCS Specific preferences in TCE Enable Analog Output Inverting Not applicable to the eDAQlite Input Output Configuration Not applicable to the eDAQlite Power Save Mode Select the power save mode option to enable the power save mode for the ...

Page 91: ...of vehicle bus module if any is defined in the current hardware setup 5 3 ELDIO Digital Input Output Layer The ELDIO is an extremely versatile layer that supports digital inputs and outputs pulse counters two vehicle bus module interfaces and optional GPS receiver Figure 5 3 Diagram of the M8 connectors on an ELDIO layer 5 3 1 ELDIO Available Inputs and Outputs The digital I O channels are grouped...

Page 92: ...pulses or used in pairs as quadrature encoder inputs typically used to track angular or linear position Connect pulse counter channels to the ELDIO using the numbered M8 connectors on the front panel For more information on setting up pulse counter inputs see Pulse Counter on page 111 NOTE Input bits i e channels used for pulse counters can simultaneously be used for digital input channels Limits ...

Page 93: ... input threshold limit to determine when an input channel switches from a logical value of TRUE to a logical value of FALSE and vice versa The difference between the upper and lower limits is fixed at nominal one volt The maximum upper limit is 4 8 volts and the minimum upper limit is one millivolt The input threshold value assigned for any given bank applies to all input bits for that bank Indivi...

Page 94: ...on the first clock pulse issued after switching to record mode the sync delay counts should be set at the default value of 10000 For a MSR of 98 304 kHz the eDAQlite data collection starts 1 25 seconds after the MSR clock is turned back on to start a synchronized test run This 98 304 kHz clock is down sampled by 12 to generate a 8192 Hz clock source for the Megadac interface board Therefore if the...

Page 95: ...rophones and amplified and unamplified transducers Single channel IEPE Integral Electronics Piezoelectric adapters and a variety of SMART modules are also available Connect transducers to the ELHLS individually using the M8 connectors located on the front panel Figure 5 5 Diagram of the M8 connectors on an ELHLS layer Each independent channel contains programmable transducer power an eight pole Bu...

Page 96: ...TS 90 Thermocouple Direct and Inverse Polynomials For more information on setting up ELNTB input channels see Thermocouple on page 121 Application Note on Measuring Differential Temperatures To measure differential temperatures using the ELNTB layer select two or more adjacent channels on the same bank Use matched thermocouples for optimum differential accuracy Due to instrumentation noise it is r...

Page 97: ...to GPS receiver configuration location geographic latitude as it influences HDOP and surrounding objects possibly blocking reception or causing multi path reception satellite constellation status and ionosphere conditions NOTE There is an anomaly in the acquisition or processing of the GPS time that results in some small discontinuities in the absolute GPS time data This occurs when the nsec chann...

Page 98: ...PS 200 directly measures the yaw and pitch at any time while the slip angle calculations require the vehicle to be moving For more information on setting up GPS inputs see Bus Oriented Input Channels on page 121 NOTE Position accuracy varies with several factors including but not limited to GPS receiver configuration location geographic latitude as it influences HDOP and surrounding objects possib...

Page 99: ... type and the selected databases When the eDAQlite receives vehicle bus message packets they are time stamped processed into individual data streams and re sampled as necessary to the user selected output rate For more information on setting up vehicle bus inputs see Bus Oriented Input Channels on page 121 Vehicle Bus Message A vehicle bus message channel acquires raw vehicle bus packets Every pac...

Page 100: ... file This can take up to a few minutes depending on the file and the speed of the PC If the parsing is successful TCE saves the CAN database file and exits the import dialog If the first pass is not successful TCE may request more information Enter the requested information in the value fields and click the Parse A2L File button While unlikely this process could iterate a number of times During t...

Page 101: ...te until one of these same actions Flash Memory All SMART modules have three logical segments of flash memory Two are reserved for factory use one to store the microprocessor execution code and the other to store serial number and factory calibration parameters The third area is the user data segment broken into two logical partitions 1 The first partition holds TCE parameters that can completely ...

Page 102: ...timestamps the images as it receives them at a maximum rate of 30 frames per second Configure the image size compression and frame rate in the transducer setup window of TCE For more information on the camera message input channel see Network Camera Input Channel on page 124 5 11 2 Network Camera Configuration NOTE The discovery and hardware configuration for network camera are in the eDAQlite web...

Page 103: ...apply power to the camera from the POE port on the switch 3 After the status indicator turns amber release the control button 4 Wait for the status indicator to turn green which indicates that the camera has been reset This may take up to two minutes NOTE The location of the control button and status indicator depends on the camera model For information on specific models refer to the Axis documen...

Page 104: ...ge network cameras page If the configuration fails try power cycling any switches or routers on the network If problems persist refer to the troubleshooting steps in the next section Figure 5 8 Example entry for a properly configured camera 8 Click the select this camera link under the camera entry to add the camera to the Selected Network Cameras list If there is no camera under Available Network...

Page 105: ... To troubleshoot a previously configured camera 1 Ping the camera s IP address to confirm that the eDAQlite can communicate with the camera To ping the camera navigate to the system tab on the web interface and click Command Prompt In the command prompt type ping xxx xxx xxx xxx where the x s are the IP address for the camera 2 If there is no reply check all the network connections including Ether...

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Page 107: ...licates of system reserved names sin cos log etc Connector Hardware connector IDs identify connector assignments for transducers The default ID consists of the eDAQlite IP address or host name layer identifier and the physical logical channel as specified in the hardware setup The following examples illustrate the eDAQlite conventions ELBRG For an ELBRG layer with an ID of Brg_1 connector IDs Brg_...

Page 108: ...hannels For example specifying full scale values of 2000 microstrain on an ELHLS channel causes the eDAQlite to set up the gain and offset circuitry as close as possible to 2020 microstrain without going under 6 1 4 Output Data Type Output Data Type Depending on the channel type the eDAQlite provides several data type options When choosing the data type consider factors such as data resolution mas...

Page 109: ...vailable for all modes except Not applicable Prerun rezeroing does not affect the fundamental transducer calibration definition Prerun zero offsets are effective for the duration of the test only NOTE The eDAQlite never performs rezeroing on test runs started after a reset caused by an exception error e g Timeout Calibration or DeviceOverFlow Mode Description Not applicable No rezeroing required I...

Page 110: ...a scope plot display for the input channel Note that the Scope Plot is similar to an analog oscilloscope except that the display is not updated until the eDAQlite acquires all of the data samples and transferred them to the host computer which creates a delay in the data presentation For more information on the scope plot see Scope Plot on page 77 DVM Select the DVM button to open a DVM display of...

Page 111: ...pulse counter first before other types of pulse counter channels Output Data Type Select an output data type of 32 bit float 32 bit unsigned or 32 bit integer The 32 bit float data type allows any of the operational modes The 32 bit unsigned type limits the available operational modes to time period on time and pulse rate while the 32 bit integer type is available only with the quadrature decoder ...

Page 112: ...113 Pulse Rate Output the number of pulse counts in one sample period in units of pulses per second Hz Use this mode in conjunction with the Integrator computed channel to measure accumulated pulse counts or other parameters that are directly proportional to accumulated pulse counts such as distance traveled revolutions etc The eDAQlite can accumulate over 4 billion counts in each sample period ho...

Page 113: ...ater than what was previously latched This results in the output pulse frequency value continuously decaying until a new pulse is detected High Frequency Inputs in the Pulse Rate Mode Use the pulse rate mode to cover the high frequency input range that cannot be accurately covered using the frequency or time modes i e 50 kHz to 1 MHz The resolution of the average input frequency is equal to the in...

Page 114: ...or a linear phase filter the field is named the roll off start frequency and is the approximate frequency at which the signal starts to attenuate The eDAQlite automatically selects a default break frequency value to ensure that no aliasing occurs The selection is based on the A D converter rate and the choice of digital filter type NOTE The check box field labeled data is protected from aliasing i...

Page 115: ...nfiguration of strain gages used TCE uses this value only in the shunt tool calibration option that defines an equivalent strain based on the gage factor and bridge factor values The bridge factor is defined here as the arithmetic sum of the active bridge legs for any bridge configuration For quarter bridge applications the bridge factor is normally one for half bridge applications where both acti...

Page 116: ... Ex shunt option Note that the downscale shunt option results in a negative span signal value 6 3 2 Simultaneous High Level Add a simultaneous high level input to any ELHLS connector For more information on the ELHLS layer see ELHLS High Level Analog Layer on page 95 NOTE Each channel on the ELHLS layer can have an independent sample rate and digital filter selection Output Data Type The fundament...

Page 117: ...e against aliasing because the guard filter only attenuates about 30 of the 25 kHz input signal content SMART Module Use the SMART module section of the setup to configure a connected SMART module For more information on setting up a SMART module channel see SMART Module Input Channels on page 118 80 Volt Range Option Use the 80 Volt Range Option to increase the full scale input range from 10 0 vo...

Page 118: ...odules with the transducer channel definition that currently exists and with any added pass through keyword value entries Blank Erase the selected SMART modules restoring the user data areas to their original blanked states LED Locate Repetitively toggle the LEDs of the selected SMART modules indicating the physical location of the selected SMART modules This function must be manually aborted 6 4 ...

Page 119: ...erent resistance For either full or half bridge configurations select any resistance in the range of 100 to 10000 ohms Gage Factor Define the gage factor for the specific strain gages used TCE uses this value only in the shunt tool calibration option that defines an equivalent strain based on the gage factor and bridge factor values Bridge Factor Define the bridge factor for the specific configura...

Page 120: ...esistance for optimum accuracy Alternatively TCE can back calculate the leadwire resistance if the bridge resistances are equal and known and if the resistances of the three relevant leadwires are equal To use this method the bridge type and bridge resistance fields must be correct Ensure the transducer is stable and then click the back calculate resistance option Back Calculate Resistance Select ...

Page 121: ... see ELNTB Non Isolated Thermocouple Layer on page 95 Output Data Type The output data type is always 32 bit float Thermocouple Type Select the type of thermocouple as T J K E or thermocouple undefined Replace Lost Data Samples Set this field to yes to fill the data samples with a fixed value of 1 0e 06 when the input voltage to an input channel is out of the thermocouple s operating range The mos...

Page 122: ...to use active querying Desired Rate serial and vehicle bus only Set the query rate if active querying is in use The limit on the query rate is a function of multiple parameters including the type of bus and the amount of broadcast data making it necessary to investigate this limit on a case by case basis Most active query requests are for packets that contain more that one bus channel If the activ...

Page 123: ...E The invalid value is defined in terms of the raw signal units as specified in the database definition Subsequently scaling the output e g by using calibration definitions that convert units also scales the invalid value accordingly Raw Data Type The raw data type is typically the data type defined in the database i e 8 bit unsigned 16 bit unsigned or 32 bit unsigned However for database bit size...

Page 124: ...ore information on the message logger see Message Logger on page 168 Size Select the size in pixels of the recorded images as one of six standard image sizes from 160 by 120 to 640 by 480 pixels The default size value is 640 by 480 pixels Compression Set the percent compression for the camera JPEG images to between 0 and 100 The default compression value is 60 Frame Rate Set the frame rate in hert...

Page 125: ...he full scale min and max values are required only if the simulation transducer data is stored in an integer format DataMode i e 16 bit or 8 bit storage modes 6 8 1 Simulation File The file based simulation transducer provides the capability to simulate input based on an ASCII file definition of the data stream allowing completely arbitrary input data streams Because TCE reads the ASCII file using...

Page 126: ... exponential decay of the signal if the decay factor is a positive fraction Note that the default value of one results in a consistent signal from pass to pass with no decay Drift Set the value used to adjust the offset value on a pass by pass basis The drift factor is added to the offset value on each successive pass Note that the default value of zero results in a consistent signal from pass to ...

Page 127: ...ffset Set the value used to offset the data values as defined in the file on a point by point basis Decay Set the value used to adjust the scale value on a pass by pass basis The scale factor is multiplied by the decay factor on each successive pass which results in an exponential decay of the signal if the decay factor is a positive fraction Note that the default value of one results in a consist...

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Page 129: ...l has been defined ID Enter a unique identifier for the channel The name must conform to ID naming conventions Valid ID names are case sensitive are limited to a maximum of 12 characters contain only valid characters i e letters a z A Z digits 0 9 and the underscore _ character start with a letter are not duplicates of system reserved names sin cos log etc Description Enter a more detailed descrip...

Page 130: ...uses the full scale estimates to set the default values for any histograms specified in the test setup DataModes 7 2 Arithmetic Computed Channels 7 2 1 Desk Calculator Desk Calculator computed channels generate data streams of either arithmetic floating point or logical Boolean results Input Channel All input channels to a single Desk Calculator channel must have the same sample rate which also de...

Page 131: ...ption status flag The results of such operations are usually some form of IEEE NAN not a number Category Operator Syntax Return Arithmetic abs abs a The absolute value of a sqrt sqrt a The square root of a log log a The natural logarithm of a log10 log10 a The base 10 logarithm of a exp exp a The exponential function of a sgn sgn a 1 for a 0 1 for a 0 and 0 for a 0 float float a a in floating poin...

Page 132: ...0 in UTC _utc_minute _utc_minute a The minute 0 59 in UTC _utc_hour _utc_hour a The hour 0 23 in UTC _utc_day _utc_day a The day 1 31 in UTC _utc_month _utc_month a The month 1 12 in UTC _utc_year _utc_year a The year in UTC _utc_day_week _utc_day_week a The day of the week 1 7 in UTC _utc_day_year _utc_day_year a The day of the year 1 366 in UTC _local_subsecond _local_subsecond a The subsecond 0...

Page 133: ...x 100 y2 2 2 x 90 y3 2 3 x 80 y4 2 4 x 70 The third step is to define the final Desk Calculator channel y as follows y y1 float s1 y2 float s2 y3 float s3 y4 float s4 Note that it is not necessary to define the intermediate variables and in fact it is less efficient from a processing point of view to use intermediate variables when they are not used more than once in the set of computed channels H...

Page 134: ...pe is the same as the input channel data type Integrate Only When TRUE Select the integrate only when TRUE option to suppress integration when the trigger channel is FALSE Enable Triggered Reset Select the enable triggered reset option to reset the integrator to the initial value when the trigger channel satisfies the defined condition Trigger Channel Specify the input channel used for the reset e...

Page 135: ... value is fixed at zero Scale Factor Specify the value to scale each input sample before adding it to the previous integration sum Setting the scale factor to the sample period results in the time integral of the input channel NOTE For an input data type of 32 bit unsigned or 32 bit signed the scale factor is fixed at one Use 64 bit Float for Sum Select the 64 bit float for sum option to ensure th...

Page 136: ...Each FALSE to TRUE transition signifies the end of a pulse period and initiates an update of the current pulse frequency which is output at a user defined rate The pulse counter frequency also updates if the time period since the last transition exceeds the current pulse counter frequency output resulting in improved response as the pulse train slows or stops NOTE The current pulse frequency initi...

Page 137: ...osition on the previous data sample the sign retains its current value Input Channel The velocity input channel data type must be 32 bit float The direction input channel data type must be either 32 bit float or 32 bit integer Output Data Type The output channel data type is 32 bit float NOTE It is strongly recommended that the direction input channel have a data type of 32 bit integer which is th...

Page 138: ... in terms of a minimum input value a maximum output value and the associated output state value The number of mapping conditions must be 32 or less The ASCII file should be a line based file with the three ordered entries per line separated by spaces or tabs NOTE The State Mapper channel can consume significant eDAQlite computational resources depending on the sample rate and the number of mapping...

Page 139: ... test run when the input does not meet any mapping conditions Latch Period Specify the time in seconds that the input channel must consistently map to the same output state before the output state switches The latch period is similar to a duty cycle on the output state preventing the output state from switching for at least this period of time This feature can eliminate state switching transients ...

Page 140: ... samples used to generate one output sample This sets the analysis window size and associated output sample rate Specify any positive integer value greater than one Statistic Algorithm Mean Standard deviation RMS Kurtosis Skewness Xth percentile TCE sorts the data samples in the analysis window in ascending order and interpolates as required between the array element data values that border the ex...

Page 141: ...cumulated closed cycle counts The Damage Equivalent Load output value Seq is computed using the following equation where xi is the load damage for each closed cycle N is the number of closed cycles and m is the damage slope For more information on the data processing algorithms used see Data Processing Algorithms on page 221 Input Channel The input channel data type must be 32 bit float Output Dat...

Page 142: ...n units to dimensionless strain units required for the fatigue processing models TCE processes the optionally scaled input channel on a point by point basis through a rainflow cycle counter using the user defined hysteresis value for peak picking For each closed cycle the computed fatigue damage is added to the running sum of cumulative fatigue damage based on the user selected fatigue damage mode...

Page 143: ...ied load range and Po and b are respectively the user defined intercept and slope of the log10 log10 function For each rainflow cycle the damage 1 Nf computed from the load range P is added to the cumulative damage sum Stress Life The stress life relationship is defined by where Nf is cycles to failure S is the applied stress range and So and b are respectively the user defined intercept and slope...

Page 144: ... the desired output channel damage units The available units are damage percent life or microdamage Note that the output channel full scale estimates are automatically assigned based on this selection Window Samples Specify the number of input samples used to generate one output sample This sets the analysis window size and associated output sample rate Specify any positive integer value greater t...

Page 145: ...elay period followed by a repetitive cycle of on TRUE periods and off FALSE periods The eDAQlite ensures that there is at least one output sample for both the on period and the off period Use a Trigger Generator channel to create an elapsed time trigger for DataModes or other computed channels that support triggering For example the eDAQlite can use a generated trigger channel to store 10 minutes ...

Page 146: ...es to conditionally set the output channel state based on the behavior of the input channel during the delay period Enable Sustain Select the enable sustain option to enable the sustain mode If not enabled the channel outputs TRUE for one sample before reverting to FALSE Trigger Start Mode Description When TRUE Start when the input channel is TRUE On FALSE TRUE edge Start when the input channel tr...

Page 147: ...put data type is the same as the input data type Trigger Channel Select the input channel used to determine when to zero suppress the input channel based on the trigger condition Trigger Mode Select from three available trigger modes to specified the trigger channel behavior The available trigger mode options are below Sustain Mode Description Unconditional Set the output to TRUE for the duration ...

Page 148: ...of the input bitmap channel and the user specified bitmap mask Use with an Anomaly Detect computed channel to generated a trigger when the eDAQlite detects a defined anomaly For more information on the Anomaly Detect computed channel see Anomaly Detect on page 157 Input Channel The input channel data type must be the output of an Anomaly Detect computed channel which is the only eDAQlite channel w...

Page 149: ...ata type is 8 bit unsigned logical Application Note Stopping a Test After a Defined Time Period To stop a test run after a certain amount of run time do the following Define a Time Channel computed channel see Time Channel on page 150 and select the 32 bit float data type option Then define a Desk Calculator computed channel see Desk Calculator on page 130 with an expression such as ElapsedTime 60...

Page 150: ...is 8 bit unsigned logical Application Note Creating a Valid Data Gate The channel output provides some feedback about the nominal time required to switch the power savings on and off but because it takes some time for the hardware to respond to the power restore commands it is not directly applicable for use as a trigger gate in an eDAQ DataMode or in a post processing environment To generate a va...

Page 151: ...r defined number of samples Note that the channel fills the first n 1 output samples with the initial value of the input channel Input Channel The input channel can be any data type Output Data Type The output data type is the same as the input data type Shift Direction Select the output channel shift direction to either lag or lead the input channel by the specified shift count Shift Count Specif...

Page 152: ...ired down sample factor 7 4 4 Up Sampler The Up Sampler channel increases the number of samples taken from the input channel by a user defined factor enabling correlation of input data with that of a channel with a higher sample rate on a point for point basis Each input channel sample repeats a number of times during the interval between the first sample and the next one based on a conversion fac...

Page 153: ...r filter where each output sample is the linear average of a user specified number of input samples For example for a tap count of five the filter averages the current sample the two samples before and the two samples after Note that the channel backfills the initial output samples with the first fully filtered output value For example if the tap count is nine the first four output samples are ass...

Page 154: ...nts Numerous examples are available in the TCE installation kit See the files in the hsfilter and sfilter subdirectories under the main TCE install directory Digital Filter Processing Notes In the steady state the taps coefficients are multiplied by the input data sample values and these products are summed to form a single filtered data output value This process is obviously computationally inten...

Page 155: ...ker sets the maximum value to the current sample value Trigger Channel If using the reset enable feature specify the desired trigger channel Trigger Mode If using the reset enable feature specify one of three available trigger reset modes 7 5 2 Min Track The Min Track channel generates an output channel that tracks the minimum value of the input channel A logical channel specified as a trigger can...

Page 156: ...nel data type must be 32 bit float or 16 bit integer Output Data Type The output data type is 32 bit float if the input channel data type is 32 bit float and 16 bit unsigned if the input channel data type is 16 bit integer Enable Triggered Reset Select the triggered reset option to enable triggered resets of the tracker NOTE Resetting the tracker sets the range value to zero Trigger Channel If usi...

Page 157: ...channel or DataMode that accepts a bitmap input is the Bitmap Trigger computed channel Window Samples Specify the number of input samples to to generate one output sample This sets the analysis window size and associated output sample rate The factor can be any positive integer greater than one Flat Line Detect Select the flat line detect routine to enable flat line detection If the difference bet...

Page 158: ...ow and xmean is the mean of the data samples in the analysis window 7 5 5 Triggered Latch The Triggered Latch channel generates an output channel that latches the previous input channel data value when triggered By default the channel latches the input data value when the trigger channel transitions from FALSE to TRUE and holds this data value until the trigger channel transitions from TRUE to FAL...

Page 159: ...ut channels The current sample rates and data types of the defined transducer and computed channels are presented for reference The input channels can have different sample rates The number of input channels is limited to 250 Detection Mode Select the desired option Normal Both FSMax and FSMin over range checks are performed with the following exceptions which are provided for channels that measur...

Page 160: ...be set to true See also Data Types Computed Channel on page 192 7 5 7 Valid Data Gate The Valid Data Gate channel generates a logical channel data stream on a sample by sample basis marking samples containing invalid data The output sample is TRUE if and only if the data samples for all input channels are valid otherwise the output sample is FALSE Use the Valid Data Gate channel by itself or in co...

Page 161: ...l pointers This overhead is usually fairly insignificant consuming only a few percent of the data file However there are some situations where this overhead can become very significant In particular the overhead in storing burst data records in the Burst History DataMode see Burst History on page 164 can be very significant when a small number of burst points less than 100 is specified Also a larg...

Page 162: ...gering provides a mechanism for eliminating undesired segments of the input data stream before it is processed by any particular DataMode algorithm Trigger Channel Specify the trigger input when using a trigger option other than always on NOTE The optional trigger channel must have the same sample rate as the set of input channels to the DataMode Triggering Option Description Always On Do not use ...

Page 163: ...run If using the always on trigger condition the label is simply time CAUTION If the setup file has a Time History DataMode that uses any trigger channel and if an eDAQlite error reset occurs while a test run is in progress some of the acquired Time History data will be lost The maximum amount of data that can be lost is the data frame size for the Time History input channels For example if the sa...

Page 164: ...torage of data both before and after the specified trigger NOTE The total number of points stored is the sum of the post trigger and pre trigger time periods multiplied by the selected data sampling rate plus one since the trigger sample is always stored Input Channel The input channels can be any data type Data Type For 32 bit float input channels select one of three available formats for data st...

Page 165: ...ned maximum number of burst records the eDAQlite compares each new burst record to the least significant burst already stored If the new burst is more significant the eDAQlite overwrites the least significant burst record with the new burst record retaining the most significant burst records The max bursts mode adds significant processing overhead NOTE The max bursts mode option is not available i...

Page 166: ... DRAM is very efficient as is copying the circular buffer filled with a burst record to the PC Card memory in a linear manner Allocating the circular buffer directly in the PC Card file system memory is somewhat less efficient in general because of the overhead in constantly writing to the PC Card memory Furthermore for rotating disks the seeks required when the circular buffer wraps around will a...

Page 167: ...uires 640000 bytes 8 4 2000 10 per burst record for a total of 960000 bytes 8 3 3 Event Slice The Event Slice DataMode stores a set of master channels and a set of slave channels in the output data file The set of master channels provides a sequence of events which are defined as changes in the state of any master input channel For each event the eDAQlite stores data samples for all channels maste...

Page 168: ... triggered time history data streams using the user specified hysteresis value and the peak valley processing algorithm For more information on the peak valley processing algorithm see Peak Valley Processing Algorithm on page 221 Input Channel The input channel data type must be 8 bit integer 16 bit integer or 32 bit float Data Type For 32 bit float input channels select one of three available for...

Page 169: ...aster input channel data type must be 8 bit integer 16 bit integer or 32 bit float Slave Input Channel Select the desired set of slave input channels using CTRL to select more than one channel The slave input channels can be any data type Data Type For 32 bit float input channels select one of three available formats for data storage and conversion NOTE Using the integer data types requires that v...

Page 170: ...unique histogram for each run NOTE The option to accumulate across all test runs is available only when using the eDAQlite RAM storage option with the SIF data format Histogram Bin Type Select evenly divided or user defined bin types Each histogram bin can accumulate counts up to 4294967295 NOTE For either of the bin types the eDAQlite uses underflow and overflow bins to count the occurrences that...

Page 171: ...of bins plus two for underflow and overflow bins For the range mean and to from histogram modes which have two dimensions the total number of bins for the DataMode is the product of the total number of bins for each dimension 8 4 3 Rainflow The Rainflow DataMode stores multiple channels of rainflow cycle histograms in the output data file The eDAQlite acquires peaks and valleys from triggered or u...

Page 172: ...of bins is the user specified number of bins plus two for underflow and overflow bins 8 4 5 Time at Level Multidimensional The Time at Level mD DataMode stores a multiple dimension Time at Level histogram in the output data file Input Channel The input channel data type must be 32 bit float or 16 bit integer If using the user defined bins option the input channel data type must be 32 bit float Num...

Page 173: ...ed to the output lines The test window contains a set of check boxes corresponding to the set of available digital output lines Check or uncheck the desired bits and select Set Bits to set the digital output lines based on the bit selections A checked box sets the output to high TRUE and an unchecked box sets the output to low FALSE Target Bit Select the desired digital output bit on the selected ...

Page 174: ...he test run stops Set Hi Set the output line to high TRUE when the test run stops Set Lo Set the output line to low FALSE when the test run stops Output Mode Description Normal Unlatched N U Output TRUE if the sample interval contains a TRUE value otherwise output FALSE Invert Unlatched I U Output FALSE if the sample interval contains a TRUE value otherwise output TRUE Normal Latched N L Output TR...

Page 175: ... Main page of the eDAQlite web interface The information bar across the top of the page displays the eDAQlite s IP address the date and time that the page was loaded and a battery status indicator When a test is initialized the information bar also indicates the name of the test setup the run number and either a go control when the test is stopped or a stop control when a test is running Refresh t...

Page 176: ... gateway as required Ethernet Link Setup Set the Ethernet link mode as Autonegotiate 100 Full 100 Half 10 Full or 10 Half Note that in almost all cases autonegotiate is the best and correct option However in some rare cases it may be helpful to force the Ethernet link mode RS 232 Setup Set the serial communication parameters within the eDAQlite by modifying file pgetty conf the file containing all...

Page 177: ...ing processes on the eDAQlite 9 2 3 System Maintenance Explore eDAQ Files Open the eDAQlite file system to browse its contents The copy file option opens the interface for transferring a file from the PC to the eDAQlite The current location within the file system is the default destination path in the copy interface Transfer a File to the eDAQ Open the interface to copy a file from the PC to the e...

Page 178: ...ed in hardware connector IDs Card Type The card type column shows each layer type Certain eDAQlite layers allow for additional configuration such as enabling message logging and editing of parameter databases When this additional configuration is available the card type listed is enabled as a hyperlink and when selected opens additional pages for configuration options The additional configuration ...

Page 179: ...ia or GPS model An ECN is an engineering change notice signifying a physical modification made to the hardware of a layer to correct or improve its performance These changes are recorded in non volatile memory within the layer Click the link to view the ECN number and the date of the change Use the storage link in the MPB row to view details or reformat the PC Card media 9 3 2 Manage Network Camer...

Page 180: ...P address and select Add Camera Configure Networked Camera To configure a specific camera on the network enter the camera serial number and select Configure Camera This is useful if the Find Cameras on Network function in the previous section cannot find the camera on the network 9 3 3 Select Storage Device Use the pick list to select internal Flash or DRAM and click Change Storage Device to chang...

Page 181: ...save test data Figure 9 5 Data tab of the eDAQlite web interface 9 6 1 SIE Test Data The SIE test data table shows all the SIE data files present on the eDAQlite The table shows the name of each file the date it was modified and options to view transfer initialize and delete the file In the get column click SIE File to upload the complete SIE file or Extract SIE Channels to upload only select chan...

Page 182: ...iew basic channel information and the actual data collected during the test run Currently Time History and message channels are the only data types viewable via the web interface 9 7 Custom Tab Use the Custom tab to install custom modules such as a serial bus module in the eDAQlite system See the installation instructions provided with the firmware installation for information on specific modules ...

Page 183: ...ds by turning the red LED on For more information on the status LEDs see Status LEDs on page 23 2 With the eDAQlite connected to the PC get the test status using TCE or the web interface Note any error or status flags and check the eDAQlite Flags section for their meaning In a few cases the flags may provide sufficient information to understand the problem For more information on getting the test ...

Page 184: ...ry contains invalid data The NVRAM memory area holds a number of eDAQlite configuration parameters including the master sample rate preference and the eDAQlite reset options When this occurs the eDAQlite resets the NVRAM parameters to their default values BootError The BootError flag indicates that the eDAQlite did not complete the boot process The eDAQlite writes additional information to the log...

Page 185: ...nning with the PC Card data storage option The typical scenario is a power failure with a dead or disconnected backup battery In almost all cases this flag indicates loss of some of the test data from the previous run PCMDiskError The PCMDiskError flag indicates that there was a PC Card I O error while running a test or attempting to transfer data from the eDAQlite It is likely that the PC Card ha...

Page 186: ...ly that this error can result from an operator mistake BatteryInterlock The BatteryInterlock error flag indicates that the backup battery interlock option is enabled and the backup battery charge or voltage level is below the defined interlock levels If a test run is in progress the test run stops and the eDAQlite resets CardException The CardException flag indicates that a type II layer has repor...

Page 187: ... may occur when many channels are taking data at very high sample rates or large numbers of computed channels are defined For a thorough discussion of this problem see Tips on Eliminating eDAQlite OverFlow Errors RAMDiskCorrupt The RAMDiskCorrupt flag indicates a corruption of the RAM Disk memory Transfer any existing test data files to the PC and reformat the RAM Disk Consider the test data file ...

Page 188: ...loating point data type in the transducer channel definitions 16 bit integer data requires only half the storage space as 32 bit floating point data The main drawback with integer data types is that they are not supported by all computed channels and DataModes There is no loss of accuracy when using the 16 bit integer data type for any of the data sources that originate from eDAQlite A D converter...

Page 189: ...to manipulate 20 PC Card files at the same time Up sample digital input channels used for triggers Often a digital input channel is used to manually trigger DataMode storage If the input channels are defined for a 2500 Hz sample rate and storage rate it is more efficient to define the digital input channel at 100 Hz and then up sample by a factor of 25 to get to the 2500 Hz sample rate required fo...

Page 190: ...Somat eDAQlite 190 I2773 4 4 en HBM public ...

Page 191: ... Type Output Data Type Input Channel Bridge 16 bit signed 32 bit float 8 bit signed Bus Oriented Vehicle Bus GPS Serial Bus 8 bit unsigned 16 bit unsigned 32 bit unsigned 32 bit float using conversion Digital Input 8 bit unsigned logic Simultaneous High Level 16 bit signed 32 bit float 8 bit signed Pulse Counter 32 bit float 32 bit unsigned 32 bit integer limited by selected mode Simulation File 8...

Page 192: ...2 bit integer 32 bit float Down Sampler all same is input Engineering Scaler 8 bit integer 8 bit unsigned 16 bit integer 16 bit unsigned 32 bit integer 32 bit unsigned 32 bit float Fatigue Damage 32 bit float 32 bit float Integer Scaler 32 bit float 8 bit integer 8 bit unsigned 16 bit integer 16 bit unsigned 32 bit integer 32 bit unsigned Integrator 32 bit float 32 bit integer 32 bit unsigned same...

Page 193: ...ned logic 8 bit unsigned logic Time Base Shifter all same as input Time Channel all 32 bit float 32 bit unsigned Timed Trigger 8 bit unsigned logic 8 bit unsigned logic Trigger Generator all 8 bit unsigned logic Triggered Latch 32 bit float 32 bit integer 32 bit unsigned same as input Triggered Zero Suppression 32 bit float 32 bit integer 32 bit unsigned same as input Up Sampler all same is input ...

Page 194: ...ix 32 bit float 16 bit integer evenly divided bins only Peak Valley Slice master 8 bit integer 16 bit integer 32 bit float slave all Rainflow 32 bit float 16 bit integer evenly divided bins only Time at Level 1D 32 bit float 16 bit integer evenly divided bins only Time at Level mD 32 bit float 16 bit integer evenly divided bins only Time History all Category Channel Type Input Data Type Output Dat...

Page 195: ...s shown in the diagram below pins 1 4 are for Ethernet communication pins 5 9 are for the networking sync connectors and pins 10 18 correspond to the serial 9 pin connector Figure 12 1 Diagram of the 26 pin D Sub connector on the communications cables for connection to the eDAQlite The following tables list the pinouts for each type of available connector and the corresponding pin on the 26 pin D ...

Page 196: ...Sub RJ 45 Pin Wire Color X O Wire Color HUB 10 100 BASE T Receive 3 3 Orange White Green White 10 100 BASE T Receive 4 6 Orange Green 10 100 BASE T Transmit 2 1 Green White Orange White 10 100 BASE T Transmit 1 2 Green Orange Connector Function 26 Pin D Sub LEMO Pin Wire Color Sync 1 Clock 5 1 Red Clock 8 2 Black Shield 7 3 bare wire Sync 2 Clock 6 1 Red Clock 9 2 Black Shield 7 3 bare wire Functi...

Page 197: ... jumpered to pin 4 12 2 ELCOM Vehicle Communications Layer Transducer Cable for Dedicated CAN Interface The dedicated CAN interface on the ELCOM layer uses a Somat SAC TRAN MP Transducer Cable 1 SAC TRAN MP 2 2 or 1 SAC TRAN MP 10 2 with an M8 connector and a set of color coded pigtail wires The following table lists the pinouts for the SAC TRAN MP cable when used with a dedicated CAN interface on...

Page 198: ...pinouts for the SAC TRAN MP cable when used for an ELHLS input 12 4 ELBRG Bridge Layer ELBRG Transducer Cable The ELBRG layer uses a Somat SAC TRAN MP Transducer Cable SAC TRAN MP with an M8 connector and a set of color coded pigtail wires The following table lists the pinouts for the SAC TRAN MP cable when used for an ELBRG input Function Pin Wire Color SWC 1 Brown CANH 2 White AGnd 3 bare wire P...

Page 199: ...les VBM The vehicle bus modules use the Somat SAC TRAN MP Transducer Cable 1 SAC TRAN MP 2 2 or 1 SAC TRAN MP 10 2 with an M8 connector and a set of color coded pigtail wires The following sections list the pinouts for the SAC TRAN MP cable when used with each available VBM interface 12 6 1 Transducer Cable for VPW Interface The following table lists the pinouts for the SAC TRAN MP cable when used...

Page 200: ...able lists the pinouts for the SAC TRAN MP cable when used with the CAN SWC interface NOTE Connection to both the SWC pin and the CAN pins is allowed but only one source can be used at any given time NOTE SWC operation is restricted to the EMCAN 04 version of the CAN VBM NOTE Always provide the 12 volt REF voltage for the SWC interface Function Pin Wire Color VPW_bus 2 White AGnd 3 bare wire 12 V ...

Page 201: ...le to function 12 6 5 Transducer Cable for MIL1553 Interface The following table lists the pinouts for the SAC TRAN MP cable when used with the MIL1553 interface Function Pin Wire Color SWC 1 Brown CANH 2 White AGnd 3 bare wire Power 5 Red 12 V REF 5 Red SWC CANL 6 Green Function Pin Wire Color ISO9141 K Line 2 White AGnd 3 bare wire VBAT 5 Red ISO9141 L Line 6 Green Function Pin Wire Color Bus B ...

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Page 203: ...ble throw switch wired as shown below should be used for switched inputs This circuit solidly switches the input line to either ground or 5 volts and prevents coupling of the input line to other digital input lines Moving the switch to the ground side is identified as FALSE Figure 13 1 Wiring diagram for the preferred switch configuration on an ELDIO input Alternate Switch The following diagram sh...

Page 204: ...t turns on when the output is set to FALSE Figure 13 3 Wiring diagram for using an incandescent bulb on an ELDIO output Operating a Light Emitting Diode LED The following diagram shows the use of an LED as an indicator in the digital output circuit A FALSE output causes the diode to light The total of all diode currents must be less than 250 mA for the an ELDIO bank The resistor R limits the curre...

Page 205: ...dard analog input on an ELHLS layer 13 2 2 SMSTRB4 Strain SMART Module Use the Somat SAC TRAN MP Transducer Cable 1 SAC TRAN MP 2 2 or 1 SAC TRAN MP 10 2 to wire SMSTRB4 inputs The following diagrams are also applicable to older SMART bridge modules that support one fixed bridge type Figure 13 6 Wiring diagram for a full bridge configuration using a Strain SMART Module 5KIPCN 5KIPCN YJKVG ITGGP 8 ...

Page 206: ...he older fixed quarter bridge SMART modules i e modules with serial numbers starting with SMSTRQB the white lead wire is routed to the internal completion resistor 13 3 ELBRG Bridge Layer 13 3 1 ELBRG Bridge Transducers Use the Somat SAC TRAN MP Transducer Cable 1 SAC TRAN MP 2 2 or 1 SAC TRAN MP 10 2 to wire ELBRG bridge transducer inputs ZEKVCVKQP 5KIPCN ZEKVCVKQP TGF ITGGP DNCEM 5 564 5 5 6 5 6...

Page 207: ...for a half bridge configuration on an ELBRG layer Figure 13 11 Wiring diagram for a quarter bridge configuration on an ELBRG layer ZEKVCVKQP 5KIPCN ZEKVCVKQP TGF ITGGP DNCEM 5KIPCN YJKVG 4 5 64 0 2 ZEKVCVKQP 5KIPCN ZEKVCVKQP TGF ITGGP DNCEM 4 5 64 0 2 ZEKVCVKQP 5KIPCN VQ KPVGTPCN EQORNGVKQP TGUKUVQT TGF ITGGP DTQYP 4 5 64 0 2 HBM public ...

Page 208: ...P Transducer Cable 1 SAC TRAN MP 2 2 or 1 SAC TRAN MP 10 2 to wire ELBRG analog inputs NOTE Do not use this wiring diagram for ELHLS channels Figure 13 12 Wiring diagram for a standard analog input on an ELBRG layer 5KIPCN 5KIPCN YJKVG ITGGP 8 DCTG 5JKGNF TQWPF 4 5 64 0 2 HBM public ...

Page 209: ...t 3 test runs are performed and the average data skew over the set of test runs is the characterized data skew value 14 2 Analog Channel Synchronization The ELHLS and ELBRG channels all employ pre start periods to compensate for their analog guard filters In addition to the guard filter skew there are some other secondary factors that influence data synchronization such as A D converter conversion...

Page 210: ... showing a typical distribution of data skews in microseconds for all EHLS channels and a variety of sample rates Note that the data skew for all channels at all sample rates is less than one microsecond which is typical for both ELHLS and ELBRG layers in general Channel Sample Rate Hz 25000 10000 2500 32768 8192 2048 HLSS_1 c01 0 00 0 00 0 00 0 00 0 00 0 00 HLSS_1 c02 0 37 0 37 0 37 0 37 0 40 0 3...

Page 211: ...at are sourced from the eDAQlite MSR is always somewhat less deterministic The major issue in dealing with these channels is referred to as resampling In general when the eDAQlite reads and time stamps the data samples the time stamps fall somewhere between eDAQlite sample periods For example for a thermocouple channel output at 1 0 Hz the input data samples almost always have fractional time stam...

Page 212: ... the data acquired on all of the slave nodes lead the data acquired on the master node by approximately one to two microseconds The reason for this is that there is a one to two microsecond delay in the propagation of the sample clock signal from the master to the slaves GPS Master Mode When using the GPS master network mode the slave data channels lead the master by the following ELDIO GPS clock ...

Page 213: ...ain signals are typically in the millivolt range The signal conditioner gain amplifiers amplify the noise components as well as the actual strain signal components In harsh electromagnetic interference EMI environments the noise contributions can even be larger in magnitude than the actual strain signal contributions Fortunately these EMI contributions often have much higher frequency content than...

Page 214: ...th Eight Pole Filter The Butterworth digital filter closely matches the attenuation and step response characteristics of a conventional analog Butterworth filter The magnitude phase and step responses are shown below Figure 15 1 Magnitude response of an approximate eight pole Butterworth filter The 3 dB frequency break frequency is 1500 Hz The sharper than exact roll off in the transition band is ...

Page 215: ...approximate eight pole Butterworth filter Note that the phase error is reasonably small up to the break frequency 1500 Hz The phase match between any two ELHLS channels using this filter is exact PRWV TGSWGPE M 2JCUG PING FGITGGU 6JGQTGVKECN 4 RRTQZKOCVKQP HBM public ...

Page 216: ...phase filter is designed using the well known Remez algorithm This filter provides a much sharper attenuation curve than the corresponding curve for the Butterworth filter Notice that a linear phase filter with a roll off start frequency of 1000 Hz at a 2500 samples per second sample rate is provided for compatibility with the similar low level layer sample rate and filter combination 5CORNG 0WODG...

Page 217: ...ilter The filter used for the frequency response is a 37 tap filter used twice to achieve 96 dB attenuation in the stop bands The response is calculated for a sample frequency of 10 Hz the roll off start frequency is 3 33 kHz and the noise floor begins at 6 667 kHz PRWV TGSWGPE M CIPKVWFG F F F HBM public ...

Page 218: ...utterworth filter The response has a group delay of 37 samples but the eDAQlite compensates for the delay so that the filtered data displays no phase shift in the stored data set Normally decimation occurs after filtering In this case every fifth sample is stored decimation by five The exact pattern of the stored data varies depending on where the decimation occurs relative to the input step edge ...

Page 219: ...versal as shown in the plot below Figure 16 1 Plot of the input signal to the eDAQlite as sampled by a test bridge channel Four bridge channels with 32 bit float output data types Twelve Statistical Analysis computed channels using the Xth percentile mode to compute the 10 50 and 90 percentile values for each of the four bridge channels Two Time History DataModes one to store the four bridge chann...

Page 220: ...he processing load The first three tests ran with no problems However Test 4 reset on a DeviceOverFlow error shortly after the start of the test run Test Bridge Sample Rate Analysis Window Size Test 1 2000 Hz 20000 samples Test 2 2000 Hz 50000 samples Test 3 5000 Hz 20000 samples Test 4 5000 Hz 50000 samples HBM public ...

Page 221: ...es since the last stored peak until their difference exceeds the hysteresis level At this point the minimum value is output as the next valley and the algorithm state switches to peak search 17 2 Rainflow Cycle Counting Algorithm Rainflow counted cycles are typically used in low cycle fatigue damage analyses The rainflow counting algorithm is based on the one pass algorithm described in the paper ...

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Page 223: ... for a selection of Somat cables Cable Length m Order Number Resistance Ohms Transducer Cable 2 1 SAC TRAN MP 2 2 0 27 10 1 SAC TRAN MP 10 2 1 25 Extension Cable 0 4 1 SAC EXT MF 0 4 2 0 06 2 1 SAC EXT MF 2 2 0 23 5 1 SAC EXT MF 5 2 0 61 10 1 SAC EXT MF 10 2 1 20 15 1 SAC EXT MF 15 2 1 84 HBM public ...

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Page 225: ...beled component from its original condition Never remove a CE compliant layer from its ring to be fitted into an older eDAQlite ring Do not disassemble individual layers HBM cannot ensure the CE compliance of any hardware that has been modified or mixed with older hardware The following diagram shows a representative CE compliant eDAQlite system with current modifications for identification Figure...

Page 226: ...nce of any cable that has been modified from its original condition The following cables have been recently modified to be CE compliant All other cables are also CE compliant SAC EPWR15 Power Cable 1 SAC EPWR15 2 SAC EXT VBM Vehicle Bus Module Extension Cable 1 SAC EXT VBM 2 HBM public ...

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Page 228: ...ility whatsoever measure and predict with confidence The Americas HBM Inc 19 Bartlett Street Marlboro MA 01752 USA Tel 1 800 578 4260 Email info usa hbm com Europe Middle East and Africa HBM GmbH Im Tiefen See 45 64293 Darmstadt Germany Tel 49 6151 8030 Email info hbm com Asia Pacific HBM China 106 Heng Shan Road Suzhou 215009 Jiangsu China Tel 86 512 682 47776 Email hbmchina hbm com cn ...

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