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NI PXI-5422 Calibration Procedure 32 ni.com
11. Measure the negative DC voltage out of the NI PXI-5422. Record the
negative DC voltage out measurement in the Measured Negative
Full-Scale Value column of Table 6.
12. Call
niFgen_AbortGeneration (niFgen Abort Generation VI) to
abort the waveform generation using the following parameter:
• vi: The session handle returned from
niFgen_init
13. Average the Measured Positive Full-Scale Value and Measured
Negative Full-Scale Value to calculate the Offset.
14. Verify that the Offset is less than or equal to the Offset Limit listed in
Table 6 for the current iteration.
15. Subtract the Offset and the Ideal Full-Scale Value from the Measured
Full-Scale Value to get the Error Full-Scale Value for both the positive
and negative settings, respectively.
16. Return to step 4 until all iterations are completed.
17. Verify that these errors are less than or equal to the limits you are using.
If any of the errors are greater than the Calibration Test Limit or the
Published Specification, perform an external adjustment.
18. Call
niFgen_close (niFgen Close VI) to close the instrument driver
session, to destroy the instrument driver session and all of its
properties, and to release any memory resources that NI-FGEN
uses. Use the following parameter:
• vi: The session handle returned from
niFgen_init
Adjusting the NI PXI-5422
If the NI PXI-5422 successfully passes all verification within the
calibration test limits, adjustment is recommended, but not required, to
guarantee its published specifications for the next two years. If the
NI PXI-5422 was not within the calibration test limits for each verification
procedure, perform the adjustment procedure to improve the accuracy of
the NI PXI-5422. Refer to the External Calibration Options section to
determine which procedures to perform.
An adjustment is required only once every two years. The adjustment
procedure automatically updates the calibration date and temperature in
the EEPROM of the NI PXI-5422.
If the NI PXI-5422 passed verification within the calibration test limits and
you do not want to do an adjustment, you can update the calibration date
and onboard calibration temperature without making any adjustments by
completing the following steps: