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National Instruments PXIe-4480 Calibration Procedure Download Page 7

NI PXIe-4480/4481 Calibration Procedure

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© National Instruments

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7

Voltage Gain Accuracy Verification/Adjustment

Voltage gain verification and adjustment can be conducted one channel at a time, all six channels 
simultaneously, as well as any number in between. Figure 2 illustrates the connections for 
parallel channel operation, while Figure 3 illustrates the connections for sequential channel 
operation.

Figure 2.  

Voltage Gain Accuracy/Flatness Connections (Six Channels)

Note

Secure the cable to the module front panel using the cable connector 

jackscrews.

1

Calibrator

2

Banana Plug Adapter

3

BNC Cable

4

BNC T-Connector

5

InfiniBand 12X-6BNC Cable

6

PXIe-4480/4481

1

3

2

6

5

4

Summary of Contents for PXIe-4480

Page 1: ...ation 2 Test Equipment 3 Connecting the PXIe 4480 4481 6 Test Conditions 12 Initial Setup 12 Verification 12 Adjustment PXIe 4480 21 Adjustment PXIe 4481 28 Reverification 33 Updating the Calibration Date without Performing Adjustment 33 Specifications 33 Where to Go for Support 34 Software Calibrating the PXIe 4480 4481 requires the installation of NI DAQmx on the calibration system NI DAQmx 16 1...

Page 2: ...ted Guide for PXI PXI Express Information about hardware and software installation device configuration and programming NI DAQmx Readme Operating system and application software support in NI DAQmx NI DAQmx Help Information about creating applications that use the NI DAQmx driver LabVIEW Help LabVIEW programming concepts and reference information about NI DAQmx VIs and functions NI DAQmx C Referen...

Page 3: ...ded Model s Where Used Minimum Requirements Calibrator Fluke 5700A AI Gain Frequency Range 40 Hz to 200 kHz Voltage Range up to 6 3 Vrms ACV Accuracy 40 Hz 0 017 1 kHz 0 016 20 kHz 0 017 50 kHz 0 037 100 kHz 0 086 200 kHz 0 32 Function Generator Keysight Agilent 33250A series Timebase Frequency Frequency Range up to 90 kHz Frequency Accuracy 2 ppm Voltage Range up to 9 Vpk Digital Multimeter PXI 4...

Page 4: ...ggitt Endevco 2947C Charge Gain 1000 pF 1 C0G calibrated to 0 1 10 32 M to BNC M Interface Cable PCB Piezotronics 002C03 Charge Gain N A AI Gain verification and adjustment can be conducted one channel at a time all six channels simultaneously as well as any number in between The minimum quantity corresponds to one channel at a time The maximum quantity corresponds to all six channels simultaneous...

Page 5: ...acy 40 Hz 0 017 1 kHz 0 016 20 kHz 0 017 50 kHz 0 037 100 kHz 0 086 200 kHz 0 32 Function Generator Keysight Agilent 33250A series Timebase Frequency Frequency Range up to 90 kHz Frequency Accuracy 2 ppm Voltage Range up to 9 Vpk InfiniBand 12X 6BNC Cable National Instruments SHB12X 6BNC All N A BNC Shorting Cap quantity 6 Pomona Electronics 5085 or Pomona Electronics 3840 50 AI Offset Resistance ...

Page 6: ...e quantity 1 minimum 11 maximum Pomona Electronics 5697 AI Gain Characteristic Impedance 50 Ω BNC F F F T Connector quantity 0 minimum 5 maximum Pomona Electronics 3284 AI Gain Characteristic Impedance 50 Ω AI Gain verification and adjustment can be conducted one channel at a time all six channels simultaneously as well as any number in between The minimum quantity corresponds to one channel at a ...

Page 7: ...y number in between Figure 2 illustrates the connections for parallel channel operation while Figure 3 illustrates the connections for sequential channel operation Figure 2 Voltage Gain Accuracy Flatness Connections Six Channels Note Secure the cable to the module front panel using the cable connector jackscrews 1 Calibrator 2 Banana Plug Adapter 3 BNC Cable 4 BNC T Connector 5 InfiniBand 12X 6BNC...

Page 8: ...Figure 3 Voltage Gain Accuracy Flatness Connections One Channel Note Secure the cable to the module front panel using the cable connector jackscrews 1 Calibrator 2 Banana Plug Adapter 3 BNC Cable 4 InfiniBand 12X 6BNC Cable 5 PXIe 4480 4481 1 2 4 5 3 ...

Page 9: ...annel at a time Figure 4 illustrates the connections for charge gain accuracy verification adjustment Figure 4 Charge Gain Accuracy Connections Note Secure the cable to the module front panel using the cable connector jackscrews 1 Calibrator 2 Banana Plug Adapter 3 10 32 to BNC Interface Cable 4 Calibration Capacitor 5 BNC Cable 6 InfiniBand 12X 6BNC Cable 7 PXIe 4480 1 2 3 6 7 5 4 ...

Page 10: ...ure 5 illustrates the connections for IEPE current accuracy verification Figure 5 IEPE Current Accuracy Connections Note Secure the cable to the module front panel using the cable connector jackscrews 1 Digital Multimeter 2 Banana Plug Adapter 3 BNC Cable 4 InfiniBand 12X 6BNC Cable 5 PXIe 4480 1 4 5 3 2 ...

Page 11: ...ure 6 illustrates the connections for timebase accuracy verification adjustment Figure 6 Timebase Accuracy Connections Note Secure the cable to the module front panel using the cable connector jackscrews 1 Function Generator 2 BNC Cable 3 BNC Shorting Cap 4 InfiniBand 12X 6BNC Cable 5 PXIe 4480 4481 3 2 4 5 1 ...

Page 12: ...ion about how to install the software and hardware and how to configure the device in Measurement Automation Explorer MAX Note When a device is configured in MAX it is assigned a device name Each function call uses this device name to determine which device to calibrate This document uses Dev_name to refer to the device name In the following procedures use the device name as it appears in MAX Veri...

Page 13: ...averaged values to the appropriate limits in Table 4 The average is the offset of the 10 V range 8 Repeat steps 2 through 7 for each range of the device When performing step 2 set the range parameter to 5 1 and 0 5 as required Table 3 Voltage Offset Accuracy Verification Configuration Configuration Value Physical channels Dev_name ai0 5 Range 10 V Coupling DC Terminal configuration Pseudodifferent...

Page 14: ...trol Task VI and wait 5 seconds for the input to settle Subsequent gain verification points which do not change the coupling do not require a delay 5 Start the task 6 Acquire readings with the PXIe 4480 4481 Table 5 Voltage Gain Accuracy Limits Range V Calibrator Output As Found Test Limit As Left Test Limit Amplitude Vrms Frequency Hz Lower Limit Vrms Upper Limit Vrms Lower Limit Vrms Upper Limit...

Page 15: ...t channels of the device In step 1 connect the output of the calibrator to the channel being verified In step 3 replace ai0 in the physical channel parameter with the channel being verified Voltage Gain Flatness Verification Note This performance characteristic is not affected by adjustment Consequently reverification after adjustment is not necessary Note DC coupled gain flatness is inherently be...

Page 16: ...ing step 2 instead of 1 kHz configure the calibrator output to the frequency listed in Table 9 The calibrator output amplitude remains constant Compare this amplitude to the appropriate limits in Table 9 Note The value of V1kHz is the measured amplitude of the 1 kHz tone not the nominal amplitude listed in Table 7 9 Repeat steps 2 through 8 for each range setting of the device When performing step...

Page 17: ...AL 2 Configure the calibrator to generate an output with the amplitude and frequency listed in the 20 000 pC row of Table 10 Note While the calibrator output is voltage its application through the series calibration capacitor creates an effective charge input QCAL VCAL CCAL For example 6 3 Vrms applied through 1000 pF creates a charge input of 6300 pCrms Table 9 Voltage Gain Flatness Limits Calibr...

Page 18: ...est Limit As Left Test Limit Amplitude Vrms Frequency Hz Lower Limit pCrms Upper Limit pCrms Lower Limit pCrms Upper Limit pCrms 20 000 6 3 1 000 6 3 V CCAL 0 9886 6 3 V CCAL 1 0116 6 3 V CCAL 0 995 6 3 V CCAL 1 005 10 000 6 3 1 000 6 3 V CCAL 0 9886 6 3 V CCAL 1 0116 6 3 V CCAL 0 995 6 3 V CCAL 1 005 2 000 1 26 1 000 1 26 V CCAL 0 9886 1 26 V CCAL 1 0116 1 26 V CCAL 0 995 1 26 V CCAL 1 005 1 000 ...

Page 19: ...ot affected by adjustment Consequently reverification after adjustment is not necessary Note During the IEPE verification the Active LED on the device front panel will illuminate RED indicating a fault condition This is an expected condition and the validity of the verification is unaffected This is a result of the DMM s low resistance tripping the IEPE s short detection monitor Complete the follo...

Page 20: ...channel being verified In step 3 replace ai0 in the physical channel parameter with the channel being verified Timebase Frequency Accuracy Verification Note All analog inputs on a single device use the same timebase circuitry Therefore the measurements made on one channel are valid for all channels Complete the following steps to verify the timebase frequency accuracy 1 Using the equipment describ...

Page 21: ...t see the instructions in the Updating the Calibration Date without Performing Adjustment section The external calibration interval is listed in the PXIe 4480 4481 Specifications An adjustment is required at least once within this interval Performing the adjustment procedure automatically updates the calibration constants date and temperature in the device EEPROM The following performance adjustme...

Page 22: ...n overview of this adjustment procedure go to ni com info and enter the Info Code PXIe448x Initialization 1 Call DAQmxInitExtCal DAQmx Initialize External Calibration VI to initialize the calibration using the following parameters deviceName Dev_name password NI calHandle myCalHandle Timebase Adjustment 2 Using the equipment described in Table 1 connect the output of the function generator to devi...

Page 23: ...gain parameter to the value of the device gain setting being calibrated where 0 for example represents 0 dB 11 Configure the calibrator to output a 3 15 Vrms signal at 1 kHz 12 Repeat step 10 for the 6 dB gain range substituting the gain parameter with 6 and the referenceVoltage parameter with 3 15 13 Configure the calibrator to output a 630 mVrms signal at 1 kHz 14 Repeat step 10 for the 20 dB ga...

Page 24: ...value that is Q C V The capacitor value may be obtained from its calibration certificate or from the sticker applied to its housing body For example for a capacitor value of 1001 pF and a calibrator voltage of 6 3 V the calculated input charge value in Coulombs is 6306 3e 12 21 Repeat steps 17 through 20 for each input channel changing the cable connections accordingly and substituting the physica...

Page 25: ...ion generator to output a sine wave of 6 3 Vrms 8 9 Vpk signal no offset at a frequency of 90 000 kHz 4 Call DAQmxAdjustDSATimebaseCal DAQmx Adjust DSA Timebase Calibration VI with the following parameters calHandle myCalHandle referenceFrequency 90000 0 Voltage Offset Adjustment 5 Using the equipment described in Table 1 connect a BNC shorting cap to each device input channel as shown in Figure 1...

Page 26: ...parameter to the value of the device gain setting being calibrated where 0 for example represents 0 dB 12 Configure the calibrator to output a 3 15 Vrms signal at 1 kHz 13 Repeat step 11 for the 6 dB gain range substituting the gain parameter with 6 and the referenceVoltage parameter with 3 15 14 Configure the calibrator to output a 630 mVrms signal at 1 kHz 15 Repeat step 11 for the 20 dB gain ra...

Page 27: ... gain 6 referenceVoltage Calculated input charge value The calculated input charge value is the product of the value of the calibration capacitor and the calibrator output value that is Q C V The capacitor value may be obtained from its calibration certificate or from the sticker applied to its housing body For example for a capacitor value of 1001 pF and a calibrator voltage of 6 3 V the calculat...

Page 28: ... 4481 It is possible to adjust the PXIe 4481 in either of two methods The Minimum Time method adjusts the voltage gain of all channels in parallel utilizing the cable connections shown in Figure 2 Alternatively the Minimum Cabling method adjusts the voltage gain of each channel sequentially utilizing the cable connections shown in Figure 3 Performance is not affected by the choice The trade off is...

Page 29: ...n and Coupling VI from the DAQmx Adjust DSA AI Calibration Polymorphic VI using the following parameters calHandle myCalHandle coupling DAQmx_Val_DC gain 0 referenceVoltage 0 0 Note Set the gain parameter to the value of the device gain setting being calibrated where 0 for example represents 0 dB 7 Repeat step 6 for each of the remaining gain ranges sequentially substituting the gain parameter wit...

Page 30: ...to be valid Committal 17 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 c...

Page 31: ...ion With Gain and Coupling VI from the DAQmx Adjust DSA AI Calibration Polymorphic VI using the following parameters calHandle myCalHandle coupling DAQmx_Val_DC gain 0 referenceVoltage 0 0 Note Set the gain parameter to the value of the device gain setting being calibrated where 0 for example represents 0 dB 7 Repeat step 6 for each of the remaining gain ranges sequentially substituting the gain p...

Page 32: ...e calibrator to output a 315 mVrms signal at 1 kHz 17 Repeat step 11 for the 26 dB gain range substituting the gain parameter with 26 and the referenceVoltage parameter with 0 315 Note All ranges must be adjusted for gain for the calibration to be valid 18 Repeat steps 8 through 17 for each input channel changing the cable connections accordingly and substituting the physical channels parameter wi...

Page 33: ...o NI Refer to Where to Go for Support for assistance in returning the device to NI Updating the Calibration Date without Performing Adjustment You can update the calibration date without performing the adjustment procedure This might be appropriate if the PXIe 4480 4481 successfully passed each of the verification procedures within the As Left test limits without adjustment Complete the following ...

Page 34: ...at private expense and is subject to the applicable limited rights and restricted data rights as set forth in FAR 52 227 14s DFAR 252 227 7014 and DFAR 252 227 7015 Where to Go for Support The National Instruments website is your complete resource for technical support At ni com support you have access to everything from troubleshooting and application development self help resources to email and ...

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