National Instruments SCXI SCXI-1102, Calibration Procedure

Page 1: ...ditioning module Contents Conventions 2 Software 2 Documentation 3 Calibration Interval 3 Password 3 Test Equipment 4 Test Conditions 4 Calibration Process 5 Initial Setup 5 Verification Procedure 7 Adjustment Procedure 12 Verifying Adjusted Values 14 Test Limits 14 Gain and Offset 15 SCXI 1102 B C Front and Rear Panel Diagrams 15 World Wide Support and Services 18 ...

Page 2: ...is a placeholder for a word or value that you must supply monospace Text in this font denotes text or characters that you should enter from the keyboard sections of code programming examples and syntax examples This font is also used for the proper names of disk drives paths directories programs subprograms subroutines device names functions operations variables filenames and extensions monospace ...

Page 3: ...ocuments by selecting Start All Programs National Instruments NI DAQmx after installing NI DAQmx For more information about the SCXI 1102 B C refer to the SCXI 1102 B C User Manual For information about installing and configuring SCXI modules refer to the SCXI Quick Start Guide Calibration Interval Calibrate the SCXI 1102 B C at a regular interval as defined by the measurement accuracy requirement...

Page 4: ...tennas picking up extra noise and thermal offsets that affect measurements Use shielded copper wire for all cable connections to the SCXI 1102 B C Use twisted pair wire to eliminate noise and thermal offsets Maintain the ambient temperature between 18 C and 28 C Keep relative humidity below 80 Allow a warm up time of at least 15 minutes for the SCXI 1102 B C and 30 minutes for the DAQ device to en...

Page 5: ...XI 1102 B C calibration constants with respect to a known voltage source 4 Verifying Adjusted Values Perform another verification to ensure that the SCXI 1102 B C is operating within its test limits after adjustments Initial Setup Complete the following steps to configure the SCXI 1102 B C for calibration 1 Make sure that all the appropriate driver and application software is installed 2 Make sure...

Page 6: ...n document the functions used for demonstrating the calibration process use the device identifiers Dev1 for the DAQ device and SC1Mod1 for the SCXI 1102 B C 1 SCXI 1300 Terminal Block 2 SCXI 1102 B C Module 3 SCXI Chassis 4 SCXI 1349 Cable Adapter 5 Shielded 68 Pin Cable 6 NB1 Cable 50 Pin Ribbon Cable 7 TBX 50 Pin Terminal Block 8 Cable to DMM 9 Cable to Calibrator 10 Calibrator 11 DMM 12 DAQ Dev...

Page 7: ...ain and offset calibration constants for each gain setting per analog input channel A complete verification of the inputs involves measuring the accuracy at all possible gain settings on all channels of the SCXI 1102 B C To view the calibration VIs in LabVIEW select Measurement I O DAQmx Data Acquisition DAQmx Advanced DAQmx Calibration on the Functions palette You can also use the Search button s...

Page 8: ...nnels Refer to the SCXI 1300 1301 Terminal Block Installation Guide for connection instructions If you are not using the recommended SCXI 1300 refer to Table 8 for the front signal pin assignments of the SCXI 1102 B C If the calibration signal source is floating connect AI to the SCXI chassis ground using the ground lug available on the SCXI terminal block 3 Set the calibrator voltage to the desir...

Page 9: ... current test point LabVIEW Block Diagram NI DAQmx Function Call Call DAQmxCreateAIVoltageChan with the following parameters taskHandle taskHandle physicalChannel SC1Mod1 aiX nameToAssignToChannel myVoltageChannel terminalConfig DAQmx_Val_Cfg_Default minVal 10 V maxVal 10 V units DAQmx_Val_Volts customScaleName Where X refers to the channel you are verifying LabVIEW Block Diagram NI DAQmx Function...

Page 10: ...all DAQmxCfgSampClkTiming with the following parameters taskHandle taskHandle source rate 1000 0 activeEdge DAQmx_Val_Rising sampleMode DAQmx_Val_FiniteSamps sampsPerChan 1000 LabVIEW Block Diagram NI DAQmx Function Call Call DAQmxTaskControl with the following parameters taskHandle taskHandle action DAQmx_Val_Task_Commit Table 2 Settling Time of the SCXI 1102 B C SCXI 1102 SCXI 1102B SCXI 1102C 3...

Page 11: ...e acquisition using the DAQmx Clear Task VI 14 Repeat steps 4 through 13 for the remaining channels 15 Repeat steps 3 through 14 for all test points in Tables 6 or 7 You have finished verifying the analog input accuracy of the SCXI 1102 B C LabVIEW Block Diagram NI DAQmx Function Call Call DAQmxReadAnalogF64 with the following parameters taskHandle taskHandle numSampsPerChan 1 timeout 10 0 fillMod...

Page 12: ...I 1300 refer to Table 8 for the front signal pin assignments of the SCXI 1102 B C If the calibration signal source is floating connect AI to the SCXI chassis ground using the ground lug available on the SCXI terminal block 2 Connect the DMM to CH 0 and CH 0 pin 3 and 4 on the rear connector Refer to Table 9 for the rear signal pin assignments of the SCXI 1102 B C Note You can access these pins usi...

Page 13: ...er to Table 5 for the settling time of the SCXI 1102 B C LabVIEW Block Diagram NI DAQmx Function Call Call DAQmxSetup1102Cal with the following parameters calHandle calHandle channelNames SC1Mod1 aiX gain 1 or 100 Where X refers to the channel you are calibrating Table 3 SCXI 1102 Voltage Set Points Gain Set Points V 1 9 6 2 0 2 6 9 100 0 09 0 06 0 02 0 00 0 02 0 06 0 09 Table 4 SCXI 1102 B and SC...

Page 14: ...e gain and offset of the SCXI 1102 B C Verifying Adjusted Values After calibrating the SCXI 1102 B C NI recommends that you verify the analog input operation by repeating the steps listed in the Verification Procedure to ensure that the SCXI 1102 B C is operating within its test limits Test Limits Refer to the SCXI 1102 B C User Manual for the specifications of the SCXI 1102 B C LabVIEW Block Diag...

Page 15: ...DAQ device errors SCXI 1102 B C Front and Rear Panel Diagrams Table 8 shows the pin assignments for the SCXI 1102 B C front panel connector Table 9 shows the pin assignments for the SCXI 1102 B C rear signal connector Table 6 SCXI 1102 and SCXI 1102 B Test Limits Gain Test Point V Upper Limit V Lower Limit V 1 9 800000 9 80345 9 79655 0 000000 0 001002 0 001002 9 800000 9 79655 9 80345 100 0 09800...

Page 16: ...I 9 AI 9 22 NC AI 10 AI 10 21 NC AI 11 AI 11 20 NC AI 12 AI 12 19 NC AI 13 AI 13 18 NC AI 14 AI 14 17 NC AI 15 AI 15 16 CH GND AI 16 AI 16 15 NC AI 17 AI 17 14 NC AI 18 AI 18 13 NC AI 19 AI 19 12 NC AI 20 AI 20 11 NC AI 21 AI 21 10 NC AI 22 AI 22 9 NC AI 23 AI 23 8 NC AI 24 AI 24 7 NC AI 25 AI 25 6 NC AI 26 AI 26 5 CH GND AI 27 AI 27 4 CJ SENSOR AI 28 AI 28 3 CJ SENSOR AI 29 AI 29 2 CH GND AI 30 A...

Page 17: ... 10 NC NC 11 12 NC NC 13 14 NC NC 15 16 NC NC 17 18 NC OUT REF 19 20 NC NC 21 22 NC NC 23 24 D GND SER DAT IN 25 26 SER DAT OUT DAQ D A 27 28 NC SLOT 0 SEL 29 30 NC D GND 31 32 NC NC 33 34 NC NC 35 36 AI HOLD COMP AI HOLD SER CLK 37 38 NC NC 39 40 NC NC 41 42 NC RSVD 43 44 NC NC 45 46 RSVD NC 47 48 NC NC 49 50 NC 49 50 47 48 45 46 43 44 41 42 39 40 37 38 35 36 33 34 31 32 29 30 27 28 25 26 23 24 2...

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