National Instruments Module SCXI-1125, Calibration Procedure, Page: 12 / 18

SCXI-1125 Calibration Procedure 12 ni.com
5. Set the calibrator to a set point for the gain value you set in step 4.
Refer to Table 3 for appropriate voltage set points.
6. Wait for 5 second settling time to elapse and then record the measured
output from the DMM.
7. Adjust the external calibration constants using the DAQmx Adjust
SCXI Calibration VI.
8. Repeat steps 5 through 7 for all voltage set points at the current gain
value in Table 3.
9. Commit the calibration changes you made in the session using the
DAQmx Close External Calibration VI. The data is written to the
hardware in this step.
10. Repeat steps 3 through 9 for all gain values in Table 3.
11. Repeat steps 2 through 10 for the remaining channels.
You have finished adjusting the gain and offset of the SCXI-1125.
Verifying Adjusted Values
After calibrating the SCXI-1125, NI recommends that you verify the
analog input operation by repeating the steps listed in the
Verification
Procedure to ensure that the SCXI-1125 is operating within its test limits.
LabVIEW Block Diagram NI-DAQmx Function Call
Call
DAQmxAdjust1125Cal
with the
following parameters:
calHandle :
calHandle
refVoltage :
(calibrator output
voltage) float64
measOutput :
(voltage measured by
DMM) float64
LabVIEW Block Diagram NI-DAQmx Function Call
Call
DAQmxCloseExtCal
with the following
parameters:
calHandle :
calHandle
action :
DAQmx_Val_Action_Commit