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National Instruments PXIe-4468, Процедура калибровки

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PXIe-4468 Calibration Procedure 

© National Instruments Corporation 

27

 

 

Initial Test Connection 

 

Note

  

Initial 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 gain flatness. 

Repeat 2 times, once for each channel. 

1.

 

Connect the AO channel under 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.

 

Configure the DMM using the information in 

Table 16

.

 

3.

 

Configure an AO Voltage channel task using the values in 

Table 

21

. 

Table 21:

 AO Setup 

Configuration 

Value 

Physical Channels 

Dev_name

/ao

x 

AO Gain* 

Gain from 

Table 20

 

Output Terminal Configuration 

Configuration from 

Table 20

 

Rate 

200000 S/s 

Sample Mode 

Continuous Sample 

Samples Per Channel 

10000 

Содержание PXIe-4468

Страница 1: ...PXIe 4468...

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

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

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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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