Molectron EPM2000, Reference Manual

Page 1: ...derutilized and idle equipment along with credit for buybacks and trade ins Custom engineering so your equipment works exactly as you specify Critical and expedited services Leasing Rentals Demos In s...

Page 2: ...EPM2000 EPM2000e Dual Channel Joulemeter Power Meter...

Page 3: ......

Page 4: ...EPM2000 EPM2000e Dual Channel Joulemeter Power Meter Reference Guide...

Page 5: ...Portland OR 97224 Phone 800 366 4340or503 620 9069 Fax 503 620 8964 www molectron com 2001 by Molectron Detector Inc All rights reserved No portion of this publication may be reproduced or transmitte...

Page 6: ...escription 8 RearPanel 8 FrontPanel 10 Operation 15 Tutorial 15 Thermopile 15 Pyroelectric 17 Modes 18 Normal Mode 18 Auto Mode 18 Average Mode 19 Statistics Mode 19 Ratio Mode 20 Instrument Settings...

Page 7: ...eBatchSize 32 Backlight 32 BufferContents 33 CommunicationsError 33 DisplayCurrentReading 33 Identification 34 IEEE 488Address 34 InstrumentSetupStore Recall 34 LineFrequency 35 LongRisetimeMode 35 Op...

Page 8: ...c Computer Interface Commands 51 Maintenance Service Calibration 53 Troubleshooting 53 Fuse Replacement 56 Instrument Calibration and Service 57 Specifications 59 Electrical Mechanical 59 Display 59 R...

Page 9: ...nted Characteristics 62 Power 62 Atmospherics Temperature 62 Atmospherics RelativeHumidity 62 Atmospherics Altitude 63 Dynamics RandomVibration 63 Emissions 63 Susceptibility 63 Appendix Declaration o...

Page 10: ...voltage and pulsed only frequency The EPM2000 is compatible with all of Molectron Detector Inc s pyroelectric silicon and PowerMax thermopile probes The EPM2000 is fast accurate and easy to use It fea...

Page 11: ...ified for the instrument The grounding conductor of the cord must be connected to earth ground Do not operate the instrument if its panels are removed or any of the interior circuitry is exposed Do no...

Page 12: ...libration and service Specifications The standards and limits of the EPM2000 FEATURES INTERFACE The EPM2000 features a standard RS 232 9 pin connector on the back panel This can connect to any similar...

Page 13: ...transition of this external signal Without a reliable external trigger set the EPM2000 to extract an artificial trigger from the incoming signal This is Internal Triggering To successfully extract an...

Page 14: ...trigger is synchronous with the leading edge of the pulse but the actual peak is determined algorithmically by sampling the input signal near the trigger From the trigger point forward the algorithm...

Page 15: ...trigger then the same sequence is initiated by a falling clock edge Figure 3 The external trigger circuit for the EPM2000 The EPM2000 searches for a peak as soon as it receives the trigger signal It c...

Page 16: ...eedup feature significantly reduces the amount of time required for an estimated value While the Speedup feature is useful for a stable laser output it is not well suited for constantly changing or un...

Page 17: ...n EPM2000 EPM2000e Reference Guide 8 5 W 10 W 15 W Measured Power Probe Output 5 s 10 s Speedup Reading Figure 6 The Speedup feature estimating a 15 Watt power reading DESCRIPTION REAR PANEL Figure 7...

Page 18: ...e three times per second Note that although in some instances the EPM2000 s display will exceed the selected range under no circumstances will the output value exceed Vmax Figure 8 Conversion formula...

Page 19: ...240 VAC 1 Amp fast blow fuse A convenient replacement fuse is stored in the holder See Maintenance Service Calibration for replacement instructions Power Switch Press the symbol for ON and the symbol...

Page 20: ...s such as baud rate I O port etc by offering access to the communications parameters menu It is also the 0 key for the Numeric Entry Keys This key permits modification of the EPM2000 s system paramete...

Page 21: ...oranging Autorange will not function with pyroelectric silicon measurements that are internally triggered Zero all thermopile ranges to allow the autorange function to operate properly when taking the...

Page 22: ...nnunciator Indicates the channel is displaying the maximum batch value in Statistics Mode MIN Annunciator Indicates the instrument is displaying the minimum batch value in Statistics Mode AVG Annuncia...

Page 23: ...Features Description EPM2000 EPM2000e Reference Guide 14...

Page 24: ...le feature the text TH appears on the right hand side of the LCD Press the or button to turn the feature on or off the text ON or OFF will appear on the left hand side of the LCD Press the button to c...

Page 25: ...it into Normal Mode by pressing 4 Switch the laser on or unblock the beam Verify proper beam alignment on the probe surface 5 Adjust the range up or down by pressing or respectively until 30 to 300 co...

Page 26: ...Pulse In connector but in such cases as the J9 0660 pyroelectric probe this will be a 25 pin Smart Probe connector 3 Turn the EPM2000 on if it s not already on If the instrument isn t in Normal Mode...

Page 27: ...iate range for any given input Auto Mode is particularly useful when the input signal varies greatly during a sampling because the EPM2000 is constantly seeking the best display range at each pulse Th...

Page 28: ...ans The annunciator will blink while the EPM2000 is in Average Mode Press again to exit Average Mode STATISTICS MODE Use Statistics Mode to measure statistical qualities of a predetermined number of s...

Page 29: ...the reading is a unitless ratio of the readings If the units are set differently the reading is a quotient and the units are the appropriate quotient For example if channel A is measuring Volts and B...

Page 30: ...To turn the Backlight on press The Backlight should immediately turn on To turn the Backlight off press The Backlight should immediately turn off DISPLAY SPEEDUP For a detailed description of the Disp...

Page 31: ...ress more quickly Press to complete the action IEEE 488 ENABLE DISABLE To enable the EPM2000EPM2000e s IEEE 488 port press To disable the port press Press until the LCD reads either or The former acti...

Page 32: ...risetime for 8 ms will change the Trigger Holdoff time to 40 ms Attempts to change it via the front panel by using the or buttons will cause changes only in increments of 4 ms Each of the EPM2000 s ch...

Page 33: ...the action Compensate for optical attenuation by adjusting the responsivity accordingly For example if a detector s responsivity is 1 53 and the beam passes through a 50 optical attenuator before stri...

Page 34: ...e action RS 232 ENABLE DISABLE To enable the RS 232 communications port press Press or until the LCD reads then press to complete the action To disable the RS 232 port activate the IEEE 488 port by pr...

Page 35: ...ode Trigger Holdoff Trigger Level Trigger Source and Units During procedures requiring many attribute changes save time by presetting states into the four memory locations Programming from a state rec...

Page 36: ...current minimum values by pressing or Press to clear the two values and begin collecting new statistical data Press to change the Batch Size The LCD will display the statistics batch size and the rest...

Page 37: ...channel of the EPM2000 can be set to trigger on some selected percentage of the current range internal trigger an external signal applied to the TRIG IN connector or the internal Trigger Bus Note that...

Page 38: ...ction of each channel of the EPM2000 independently using that channel s key The instrument will not allow access to this function unless it detects an attached PowerMax laser probe To activate Wavelen...

Page 39: ...Operation EPM2000 EPM2000e Reference Guide 30...

Page 40: ...will function as described with either the RS 232 or IEEE 488 interface If the EPM2000 receives a command it does not know or cannot process no action will occur unless IEEE 488 Communication Error re...

Page 41: ...e Average Mode Batch Size of each channel of the EPM2000 Command Form CHannel A B ALL AVERage BATch_size 2 99 Examples Input Instrument Reply ch a aver bat 42 none ch b aver bat 28 none ch all aver ba...

Page 42: ...nt Reply out buffer contents OUTPUT BUFFER CONTENTS 16 BYTES COMMUNICATIONS ERROR Set the EPM2000 to echo back invalid commands Command Form COMMunication ERROR ON OFF Examples Input Instrument Reply...

Page 43: ...s 0 31 Examples Input Instrument Reply comm gpib addr 5 none comm gpib addr COMM GPIB ADDRESS 5 INSTRUMENT SETUP STORE RECALL Set the EPM2000 to store certain instrument attributes in or retrieve thos...

Page 44: ...t corresponds to the maximum risetime ms which the EPM2000 can accurately measure 2 ms is a scale factor of 1 4 ms is a scale factor of 2 etc Command Form CH A B ALL TRIGger RISEtime 2 4 8 16 Examples...

Page 45: ...none out buf OUTPUT BUFFER FIXED OUTPUT CONTINUOUS Set the EPM2000 to either continuously transmit data or store data in its internal buffer To continuously transmit data via RS 232 the DTR line must...

Page 46: ...command determines the format of pulse data only The three forms are Binary ASCII and ASCII Binary The most compact form of data storage In this mode the EPM2000 transmits 8 bit values which decode to...

Page 47: ...1 0 If Unit Information Units 00 Joules 01 Volts 10 Watts 11 Hertz Data Bytes contain the 12 bit value of the reading They are always in the order Data High Byte Data Low Byte In the Data High Byte b...

Page 48: ...CH A Unit Information End of Data Timestamp bytes are three byte sequences containing a 21 bit time signature Timestamp bytes are only transmitted in binary mode and only when the timestamp function i...

Page 49: ...00V DEV 0 001E 00V Command Form OUTputFORMat BINary ASCII ASCII Examples Input Instrument Reply out form bin none out form OUTPUT FORMAT BINARY PROBE TYPE Query the channel to determine the type of pr...

Page 50: ...1mV RESET Immediately reset the EPM2000 Command Form RST Example Input Instrument Reply rst unit resets RESPONSIVITY Set or query the pyroelectric or thermopile responsivity of either channel Express...

Page 51: ...D 2400 RS 232 PARITY Set or query the RS 232 parity bit setting of the EPM2000 Command Form COMMunication RS232 PARity ODD EVEN NONE Examples Input Instrument Reply comm rs232 par even none comm rs232...

Page 52: ...t speed off none syst opt speed SYSTEM OPTION SPEEDUP OFF STATISTICS BATCH SIZE Set or query the specified channel s batch size in Statistics Mode As with setting the batch size from the front panel s...

Page 53: ...the values transmitted by EPM2000 channels in Statistics Mode Although they can be specified in any order data will be transmitted only in the following order AVG DEV MIN MAX Include headers to add a...

Page 54: ...under 54 minutes 221 001536 seconds before rolling over to 0 The timestamp counter will also reset to 0 upon receipt of the out time on command Timestamp is cross channel If it s activated then both...

Page 55: ...and Form CHan A B ALL TRIGgering SouRCe INTernal EXTernalPOSitive EXTernalNEGative SLAVe Examples Input Instrument Reply ch a trig src extneg none ch b trig src slav none ch all trig src CHAN A TRIG S...

Page 56: ...5 47e 7 none ch b wave 5 14e 7 none ch all wave CHAN A WAVELENGTH COMPENSATION 547 nm CHAN B WAVELENGTH COMPENSATION 514 nm ZERO In thermopile mode this command sets the specified channel s current pr...

Page 57: ...or Placing a hex 10 value in the output data stream if the host output format is binary The hex 10 value is the only remaining binary status value that can hold a special meaning it represents missin...

Page 58: ...urce slaved to A ch a trig lev 8 TriggerA level 8 out cont off Deactivate continuous output out dep 4095 Buffer depth 4095 bytes ch all range 30mj Range both channels 30mJ out form bin Set output form...

Page 59: ...ds successive pulse energy until pulses stop To read the probe pulse magnitude in volts press SET EXP Press W during pyroelectric silicon measurements to display power density in watts Press Hz when a...

Page 60: ...r stop the laser in preparation for an exposure The TRG annunciator should deactivate 11 Press EXP to enter the Exposure mode Unblock the laser beam or start the laser to begin the Exposure accumulati...

Page 61: ...ry the instrument for the data currently displayed on the LCD readout Command Form Channel A B ALL QUERY Example Input Instrument Reply Ch a query CHAN A QUERY 19 51 J exp on Note Exposure readings ca...

Page 62: ...the probe in the beam Verify the probe is connected to the Pulse In or Smart Probe connector If the trigger source is external be sure an actual trigger pulse is applied to the Trigger In connector I...

Page 63: ...s been activated Verify the host computer has selected the correct COM port address Verify the cable is connected and in good condition If the cable has become disconnected the COM port may have to be...

Page 64: ...en determining a proper range for an unknown signal always start at the highest possible range and work downward from there The EPM2000 indicates a value but there are no pulses arriving The EPM2000 w...

Page 65: ...or both channels are overranging If either or both channels are overranging while the instrument is in ratio mode the ratio reading will be invalid This is a known bug for instruments containing firm...

Page 66: ...e our methods precision and repeatability Molectron has increased its floor space to 20 000 square feet Our Metrology department has expanded into this space with the addition of several new laser lab...

Page 67: ...structed of cardboard with a minimum 375 lbs 170 kg test strength Cushion the instrument in the shipping carton with packing material or urethane foam on all sides between the carton and the instrumen...

Page 68: ...n off switchable RANGES Ranges are limited to 5 or 6 decades depending on probe type Energy 1 pJ to 10 J in 28 ranges Power 1 mW to 10 KW in 15 ranges Frequency 0 1 to 1000 Hz for pyroelectric silicon...

Page 69: ...V 50 V typical ANALOG OUTPUT Full scale output 2 00 VDC Output Impedance 100 Update Rate 3 Hz EXTERNAL TRIGGER INPUT Optically coupled 100 in series with LED Rising falling edge trigger via user contr...

Page 70: ...x 4 5 WEIGHT 2 90 kg 6 38 lbs FIRMWARE REVISIONS Every EPM2000 contains three programmed chips one for each analog board and one for the digital board Knowing the firmware revisions of these chips is...

Page 71: ...Mode Volts Range 2 Volts Risetime Mode 2 ms RS 232 Settings 9600 N 1 8 bit data Statistics Batch Size 50 Statistics Restart Mode Manual Thermopile Compensation Wavelength 514 nm Thermopile Measurement...

Page 72: ...nity Requirements EN 55011 Radiated Emissions Class A EN 50081 1 Conducted Emissions Requirements Note To maintain emission requirements when connecting to the serial interface use only high quality d...

Page 73: ...Specifications EPM2000 EPM2000e ReferenceGuide 64...

Page 74: ...Appendix Declaration of Conformity 65 EPM2000 EPM2000e Reference Guide APPENDIX DECLARATION OF CONFORMITY...

Page 75: ...Appendix Declaration of Conformity EPM2000 EPM2000e Reference Guide 66...

Page 76: ...Buffer 36 Continuous 36 Depth 36 Dump 37 Format 37 Probe Type 40 Range Current 40 Maximum Minimum 41 Reset 41 Responsivity 41 RS 232 Baud Rate 42 Parity 42 Stop Bits 42 Self Test 43 Speedup 43 Statis...

Page 77: ...34 IEEE 488 Address Command 34 Instrument Setting 22 Connector 10 Enable Disable Instrument Setting 22 Input Impedance 60 Instrument Calibration and Service 57 Audible Beeper 20 Average Batch Size 21...

Page 78: ...solution 59 Responsivity Command 41 Instrument Setting Pyroelectric 24 Thermopile 24 RS 232 Baud Rate 25 Command 42 Instrument Setting 25 Baud Rates 61 Enable Disable 25 Instrument Setting 25 Interfac...

Page 79: ...e Guide 70 Source 28 Command 46 Instrument Setting 28 Tutorial Pyroelectric 17 Thermopile 15 U Units Command 46 W Warranted Characteristics 62 Wavelength Compensation 29 Command 47 Instrument Setting...

Page 80: ...uipment Have surplus equipment taking up shelf space We ll give it a new home Learn more Visit us at artisantg com for more info on price quotes drivers technical specifications manuals and documentat...