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PXIe-4468 Calibration Procedure

Initial Test Connection

Note

Initial test connection is same as AI Offset, as shown in Figure 1 or

Figure 2.

Verification Procedure

Complete the following procedure to verify the AI gain 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 each gain setting.

2. Configure the calibrator to generate an output with the amplitude

and frequency from Table 4.

3. Create and configure an AI Voltage channel task using the values in

Table 5 .

Table 5: AI Gain Verification Configuration

Configuration Value

Physical Channels Dev_name/aix

Gain* Gain from Table 4

Coupling AC

Terminal Configuration Pseudodifferential

Excitation (IEPE) 0 (A)

Acquisition mode Finite number of samples

1. Launch MAX.10
2. Select My System»Devices and Interfaces»NI PXIe-4468.10
3. Start self-calibration using one of the following methods:10
4. Click Self-Calibrate in the upper right corner of MAX.10
5. Right-click the name of the DUT in the MAX configuration tree and select Self-Calibrate from the drop-down menu.11
1. 0B0BConnect the AI channel under test to the Calibrator as shown in Figure 1 or Figure 2.12
2. 1BConfigure the calibrator to output 0V DC, with GND engaged.13
3. 2B1BCreate and configure an AI voltage task on the DUT as shown in Table 2.13
4. 3B2BStart the task.14
5. 4B3BAcquire readings with the DUT.14
6. 5B4BOn a per channel basis, average all of the acquired samples.14
7. 6B5BStop and clear the task.14
8. 7B6BCompare the averaged values to the appropriate limits in Table 1. The average is the offset at the tested gain setting.14
1. 8B7BConnect the AI channel under test to the Calibrator as shown in Figure 1 or Figure 2.15
2. 9B8BConfigure the calibrator to generate an output with the amplitude and frequency from Table 4.15
3. 10B9BCreate and configure an AI Voltage channel task using the values in Table 5 .15
4. 11B11BStart the task.16
5. 12B12BAcquire readings with the DUT.16
6. 13B13BCalculate the RMS amplitude of the acquired fundamental harmonic. Compare this amplitude to the appropriate voltage limits in Table 4. The calculated amplitude is used to verify the gain accuracy of the channel under test at the tested gain setting.16
14B14BAs an example, use the Extract Single Tone Information VI to help calculate RMS. Note that the output of this VI is peak amplitude, and must be divided by √2 to convert to RMS.16
7. 15B15BStop and clear the task.16
1. 16B16BConnect the AI channel under test to the Calibrator as shown in Figure 1 or Figure 2.17
3. 18BConfigure an AI Voltage channel task using the values in Table 8.17
2. 17B18B Configure the calibrator to generate an output with the frequency listed in Table 6 and amplitude listed in Table 7.17
4. 19B19BStart the task.18
5. 20B20BAcquire the readings with the DUT.18
6. 21B21BCalculate the RMS amplitude of the acquired fundamental harmonic. The first measured amplitude represents V1kHz referenced in Table 6. Subsequent test points will be calculated based on V1kHz, as shown in Table 6.18
22B22BAs an example, use the Extract Single Tone Information VI to help calculate the RMS. Note that the output of this VI is peak amplitude, and it must be divided by √2 to convert to RMS.18
7. 23B23BStop and clear the task.18
2. 25B26B Set the DMM to the AMPS function and the 10 mA range for the 4 mA and 10 mA test points, and the 100 mA range for the 20 mA test point.20
1. 24B25BConnect the AI channel under test to the DMM as shown in Figure 3 or Figure 4.20
3. 26BCreate and configure an AI Voltage task using the values in Table 10.20
4. 27B27BStart the task.21
5. 28B28BAcquire readings with the DUT. The readings are not used; the task is run to set the device configuration.21
6. 29B29BMeasure the output current on the DMM.21
7. 30B30BStop and clear the task.21
8. 31B31BCompare this value to the limits in Table 9.21
1. 32B32BConnect the AO channel under test to the DMM as shown in Figure 5 or Figure 6.23
2. 33B33BConfigure the DMM using the information in Table 12.23
3. 34B34BConfigure an AO Voltage channel task using the values in Table 13.23
4. 35B35BSet the AO Gain parameter according to the values from Table 14.24
5. 36B36BCreate an array of 20000 points and fill every element with value 0.24
6. 37B37BWrite the array to AO and start the task.24
7. 38B38BMeasure the output voltage with the DMM.24
8. 39B39BStop and clear the task.24
9. 40B40BCompare the result with the limits in Table 11.24
1. 41B41BConnect the AO channel under test to the DMM as shown in Figure 5 or Figure 6.25
3. 43BConfigure an AO Voltage channel task using the values in Table 18.25
2. 42B43B Configure the DMM using the information in Table 16.25
4. 44B44BCall Basic Function Generator using the parameters in Table 19.26
5. 45B45BWrite the resulting waveform to AO and start the task.27
6. 46B46BMeasure the output voltage with the DMM.27
7. 47B47BStop the task.27
8. 48B48BCompare the result with the limits in Table 15.27
1. 49B49BConnect the AO channel under test to the DMM as shown in Figure 5 or Figure 6.29
3. 51BConfigure an AO Voltage channel task using the values in Table 21.29
2. 50B51BConfigure the DMM using the information in Table 16.29
4. 52B52BCall DAQmx Channel Property Node, and set the AO Idle Output Behavior property (Analog Output>>General Properties>>Output Configuration>>Idle Output Behavior) to Zero Volts30
5. 53B53BCall Basic Function Generator Parameters using the parameters in Table 22.30
6. 54B54BWrite the resulting waveform to AO and start the task.30
7. 55B55BMeasure the output voltage with the DMM, and record as V1kHz for future calculations. The first measured amplitude represents V1kHz referenced in Table 20. Subsequent test points will be calculated based on V1kHz, as shown in Table 20.30
8. 56B56BStop the task.30
9. 57B57BCompare the result with the limits in Table 20.30
10. 58B58BConnect the AO channel under test to the DMM as shown in Figure 7 or Figure 8.32
11. 59B59BConfigure the DMM using the information in Table 12.32
12. 60B60BConfigure an AO Voltage channel task using the values in Table 25.33
13. 61B61BCreate an array of 20000 points and fill every element with value 0.33
14. 62B62BWrite the array to AO.33
15. 63B63BStart the task.33
16. 64B64BMeasure the output voltage on the DMM.33
17. 65B65BStop and clear the task.33
18. 66B66BCompare this value to the limits in Table 23.33
1. Connect the AI channel under test to the function generator as shown in Figure 9 or Figure 1035
2. Configure the function generator to output a sine wave of 6.3 Vrms (8.9 Vpk) signal, no offset, at a frequency of 10.000 kHz.35
3. Create and configure an AI voltage task on the DUT as shown in Table 27.35
Table 27: Timebase Frequency Verification Configuration35
4. Start the task.36
5. Acquire reading with the DUT.36
6. Measure the frequency using the Extract Single Tone Information VI of the acquired signal around 10 kHz. Compare the measured frequency to the limits in Table 27.36
7. Stop and clear the task. Stop generating a signal with the function generator.36
- Adjustment Procedure36
1. Initialization36
2. Connect the calibrator to AI0 as shown in Figure 1 or Figure 2.37
3. Configure the calibrator to generate an output with the amplitude of 6.3 Vrms and frequency of 1kHz.37
4. Call DAQmxAdjust4468Cal (DAQmx Adjust 4468 Calibration VI from the DAQmx Adjust DSA AI Calibration Polymorphic AI), using the following parameters:37
- Adjustment Procedure37
1. Connect channel AI0 to the function generator as shown in Figure 9 or Figure 10.37
2. Configure the function generator to output a sine wave of 6.3 Vrms (8.9 Vpk) signal, no offset, at a frequency of 90.000 kHz.38
3. Call DAQmxAdjustDSADeviceTimebaseCal (DAQmx Adjust DSA Device Timebase Calibration VI) with the following parameters to perform the timebase adjustment:38
- Committal Procedure38
1. Call DAQmxCloseExtCal (DAQmx Close External Calibration VI) with the following parameters to finish the calibration adjustment:38
1. Open a calibration session using the DAQmx Initialize External Calibration VI with the following parameters:39
2. Close the session with the DAQmx Close External Calibration VI with the following parameters:39

Brand	National Instruments
Model	PXIe-4468
Category	Control Unit
Language	English

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