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PXIe-4468 Calibration Procedure 

36

 ni.com/services 

 

2.

 

Configure the function generator to output a sine wave of 6.3 V

rms

 (8.9 

V

pk

) signal, no offset, at a frequency of 90.000 kHz. 

3.

 

Call DAQmxAdjustDSADeviceTimebaseCal (DAQmx Adjust DSA Device 
Timebase Calibration VI) with the following parameters to perform the 
timebase adjustment: 

 

calHandle: 

myCalHandle 

 

referenceFrequency: 

90000.0 

Committal Procedure 

1.

 

Call DAQmxCloseExtCal (DAQmx Close External Calibration VI) with the 
following parameters to finish the calibration adjustment: 

 

calHandle

: myCalHandle 

 

action

: DAQmx_Val_Action_Commit or DAQmx_Val_Action_Cancel 

Use the action 

cancel 

if there has been any error during the calibration 

or if you do not want to save the new calibration constants in the device 
EEPROM. 

Use the action 

commit

 if you want to save the new calibration constants 

in the device onboard storage. 

Perform Reverification 

Perform all tests in the Verification section after completing Adjustment. This 
verification compares the As-Left limits with measurement data collected 
after the DUT adjustment. The As-Left limits may be tighter than the As-
Found limits. 

Summary of Contents for PXIe-4468

Page 1: ...PXIe 4468...

Page 2: ...September 2022 PXIe 4468 Calibration procedure...

Page 3: ...ni com services PXIe 4468 Calibration Procedure...

Page 4: ...s 5 Required Software 5 Recommended Documentation 6 Test Equipment 6 Warm Up the DUT 8 Perform Self Calibration 8 Perform Verification 9 AI Offset Accuracy Verification 9 AI Gain Accuracy Verification...

Page 5: ...ions Verification Verification evaluates the measured calibration results against the defined As Found Limits The result of the evaluation is expressed as a Pass Fail condition in the calibration cert...

Page 6: ...ts Setup 10 minutes Warm Up 15 minutes Verify Adjust and Reverify 19 minutes 36 344 Verify Only 8 minutes 17 171 Adjust Only 3 minutes 2 2 Note Estimated test times assume the user is conducting a man...

Page 7: ...IGH that the fan filters are clean and that the empty slots contain filler panels For more information refer to the Maintain Forced Air Cooling Note to Users document available at ni com manuals If a...

Page 8: ...tion PXIe 4468 Getting Started Guide PXIe 4468 Specifications NI DAQmx Readme NI DAQmx Help LabVIEW Help NI DAQmx C Reference Help NI DAQmx NET Help Support for Visual Studio Test Equipment This secti...

Page 9: ...t Range 1 Vrms 10 Vrms Frequency Range 20Hz to 100 kHz Function Generator Keysight Agilent 33250A series Timebase Frequency Frequency Range up to 90 kHz PXI Express Chassis NI PXIe 1082 NI PXIe 1085 N...

Page 10: ...quate Warm up time for all components of the calibration system Perform Self Calibration Self calibration should be performed after the DUT has warmed up for the recommended time period This function...

Page 11: ...menu Perform Verification AI Offset Accuracy Verification Test Limits Table 1 AI Offset Verification Limits Device Gain dB As Found Test Limit As Left Test Limit Lower Limit mV Upper Limit mV Lower Li...

Page 12: ...XIe 4468 with BNC Figure 2 Initial Connection for AI Offset mXLR 1 Calibrator 3 BNC mXLR Cable 2 Banana BNC Adapter 4 PXIe 4468 with mXLR Verification Procedure Complete the following procedure to ver...

Page 13: ...Pseudodifferential Excitation IEPE 0 A Acquisition mode Finite number of samples Rate 250000 Samples per channel 125000 As you configure the AI voltage task refer to Table 3 for the maximum and minimu...

Page 14: ...tting AI Gain Accuracy Verification Test Limits Table 4 AI Gain Verification Limits Device Gain dB Calibrator Output As Found Test Limit As Left Test Limit Amplitude Vrms Frequency Hz Lower Limit Vrms...

Page 15: ...hannel under test to the Calibrator as shown in Figure 1 or Figure 2 Repeat 6 times once for each gain setting 2 Configure the calibrator to generate an output with the amplitude and frequency from Ta...

Page 16: ...ed amplitude is used to verify the gain accuracy of the channel under test at the tested gain setting As an example use the Extract Single Tone Information VI to help calculate RMS Note that the outpu...

Page 17: ...owing procedure to verify the AI flatness accuracy Repeat 2 times once for each channel 1 Connect the AI channel under test to the Calibrator as shown in Figure 1 or Figure 2 Repeat 6 times once for e...

Page 18: ...Per Channel 125000 Refer to Table 3 for the maximum and minimum voltages to specify to ensure the specified gain range is used on the module 4 Start the task 5 Acquire the readings with the DUT 6 Calc...

Page 19: ...st Limits Table 9 IEPE Current Limits IEPE Current Setting mA As Found Test Limit Lower Limit mA Upper Limit mA 4 3 858 4 205 10 9 655 10 523 20 19 247 20 976 Initial Test Connection Figure 3 Initial...

Page 20: ...each channel 1 Connect the AI channel under test to the DMM as shown in Figure 3 or Figure 4 Repeat 3 times once for each IEPE current setting 2 Set the DMM to the AMPS function and the 10 mA range f...

Page 21: ...adings are not used the task is run to set the device configuration 6 Measure the output current on the DMM 7 Stop and clear the task 8 Compare this value to the limits in Table 9 Note After the last...

Page 22: ...ure 5 Initial Connection for AO Differential Offset BNC 1 DMM Ensure guard to set to LO 3 BNC BNC Cable 2 Banana BNC Adapter 4 PXIe 4468 with BNC Figure 6 Initial Connection for AO Differential Offset...

Page 23: ...Table 12 Table 12 DMM Configuration Configuration Value Function DC Volts DCV Range Fixed 100 mV Number of Power Line Cycles NPLC 100 MATH NULL Enabled Repeat 2 times once for each output terminal co...

Page 24: ...o AO and start the task 7 Measure the output voltage with the DMM 8 Stop and clear the task 9 Compare the result with the limits in Table 11 AO Differential Gain Accuracy Verification Test Limits Tabl...

Page 25: ...ial test connection is same as AO Differential Offset as shown in Figure 5 or Figure 6 Verification Procedure Complete the following procedure to verify the AO differential gain accuracy Repeat 2 time...

Page 26: ...Amplitude Vpk 0 0 10 6 3 2 10 10 10 2 0 2 20 20 1 0 63 2 30 30 1 0 2 2 3 Configure an AO Voltage channel task using the values in Table 18 Table 18 AO Setup Configuration Value Physical Channels Dev_n...

Page 27: ...on between AO Gain DMM Range and Signal Amplitude 5 Write the resulting waveform to AO and start the task 6 Measure the output voltage with the DMM 7 Stop the task 8 Compare the result with the limits...

Page 28: ...its Device Gain dB Output Terminal Configuration Frequency As Found Test Limit Lower Limit Vrms Upper Limit Vrms 0 10 20 and 30 Differential 1 kHz V1kHz 20 kHz 0 999079 V1kHz 1 000921 V1kHz 90 6 kHz 0...

Page 29: ...r test to the DMM as shown in Figure 5 or Figure 6 Repeat 2 times once for each output terminal configuration Repeat 4 times once for each AO Attenuation Repeat 3 times once for each frequency 2 Confi...

Page 30: ...arameters Parameter Value Signal Type Sine Wave Frequency 1000 Hz Amplitude Amplitude from Table 17 Sampling Info Sampling Rate 200000 S s Sampling Info Number of Samples 10000 Refer to Table 17 for d...

Page 31: ...V Upper Limit V Lower Limit V Upper Limit V 0 0 00600 0 00600 0 00152 0 00152 1 0 99325 1 00675 0 99790 1 00210 2 1 99250 2 00750 1 99732 2 00268 3 2 99175 3 00825 2 99674 3 00326 4 3 99100 4 00900 3...

Page 32: ...ation Procedure Complete the following procedure to verify common mode gain and offset Repeat 2 times once for each channel 10 Connect the AO channel under test to the DMM as shown in Figure 7 or Figu...

Page 33: ...rminal Configuration Differential Rate 200000 S s Sample Mode Continuous Sample Samples Per Channel 20000 Common mode voltage Test Value from Table 23 13 Create an array of 20000 points and fill every...

Page 34: ...ft Test Limit Anplitude Vrms Frequency kHz Lower Limit kHz Upper Limit kHz Lower Limit kHz Upper Limit kHz 6 3 10 000 9 99973 10 00027 9 99992 10 00008 Initial Test Connection Figure 9 Initial Connect...

Page 35: ...wing procedure to verify the timebase accuracy 1 Connect the AI channel under test to the function generator as shown in Figure 9 or Figure 10 2 Configure the function generator to output a sine wave...

Page 36: ...the task Stop generating a signal with the function generator Perform Adjustment AI AO Gain and Offset Adjustment Perform an adjustment at least once within the calibration interval Adjustment automat...

Page 37: ...Adjust DSA AI Calibration Polymorphic AI using the following parameters calHandle myCalHandle referenceVoltage 6 3 Timebase Adjustment Perform an adjustment at least once within the calibration inter...

Page 38: ...h the following parameters to finish the calibration adjustment calHandle myCalHandle action DAQmx_Val_Action_Commit or DAQmx_Val_Action_Cancel Use the action cancel if there has been any error during...

Page 39: ...djustment Complete the following steps to update the calibration date 1 Open a calibration session using the DAQmx Initialize External Calibration VI with the following parameters deviceName Dev_name...

Page 40: ...their respective companies For patents covering National Instruments products technology refer to the appropriate location Help Patents in your software the patents txt file on your media or the Natio...

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