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National Instruments Corporation
13
NI 5122/5124 Calibration Procedure
♦
For PXI digitizers:
•
Ensure that the PXI chassis fan speed is set to HI, that the fan filters are
clean, and that the empty slots contain filler panels.
•
Plug the PXI chassis and the calibrator into the same power strip to
avoid ground loops.
♦
For PCI digitizers:
•
Plug the PC and the calibrator into the same power strip to avoid
ground loops.
External Calibration Procedures
The complete external calibration procedure consists of self-calibrating,
verifying the performance of the digitizer, adjusting the calibration
constants, and verifying again after the adjustments. In some cases, the
complete calibration procedure may not be required. Refer to the
section for more information.
The external calibration procedure automatically stores the calibration date
to allow traceability.
Verifying NI 5122/5124 Specifications
Note
Always self-calibrate the NI 5122/5124 before beginning a verification procedure.
This section describes the program you must write to verify either the
calibration test limits or the published specifications for the NI 5122/5124.
Refer to the
section to determine which limits
to use in these procedures.
All verification procedures described in this section begin with
niScope_init
(niScope Initialize VI) with
resetDevice
set to
NISCOPE_VAL_TRUE
, and end with
niScope_close
(niScope Close VI).
Note
If any of these tests fail immediately after you perform an external adjustment, verify
that you have met the required test conditions listed in the
section before you return the digitizer to NI for repair.
Vertical Offset and Vertical Gain Accuracy
Table 3 contains the input parameters for verifying both vertical offset
accuracy and vertical gain accuracy of the NI 5122/5124.
To verify vertical offset accuracy, complete the procedures described in the
section for each of the 39 iterations listed in