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National Instruments Corporation
13
NI 5421/5441 Calibration Procedure
Verifying NI 5421/5441 Specifications
Note
Always self-calibrate the NI 5421/5441 before beginning a verification procedure.
This section provides instructions for verifying the NI 5421/5441
specifications. This section also includes instructions for updating the
calibration cycle.
Verification determines whether the device is performing within its
specifications prior to external adjustment. Verification and external
adjustment together comprise a complete calibration. To verify that the
NI 5421/5441 still meets its specifications, you must use NI-FGEN to
control the NI 5421/5441.
The steps in the verification procedures describe the code that you use to
generate the appropriate signals, as well as the NI-FGEN function calls
that you make to verify specifications.
You can verify the following specifications for the NI 5421/5441:
•
Oscillator frequency accuracy
•
DC gain and offset accuracy
The verification procedure for each of these specifications includes setting
up, programming, and cleaning up.
Note
If any of these tests fail immediately after you perform an external adjustment, verify
that you have met the required test conditions before you return the NI 5421/5441 to NI for
repair.
Refer to Table 2 for information about which instrument to use for
verifying each specification. Refer to Figure 3 for the names and locations
of the NI PXI-5421/5441 and the NI PCI-5421 front panel connectors.
