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Table 11. Calibrator Configuration for AC Accuracy Adjustment
Output Function
Amplitude (V RMS)
AC Voltage
2.00
e)
Wait for one second to allow the output amplitude of the calibrator to settle.
f)
Call and configure the NI 9775 adjustment function according to the following table.
Table 12. NI 9775 AC Adjustment Configuration
Physical Channel Coupling Mode
Reference Value
cDAQMod8/AI0:3
AC
The output frequency setting of the calibrator in Hz
g)
Repeat steps d through f for each point in the adjustment points array obtained in
step c.
h)
Close and commit the calibration session.
i)
Clear the task.
4.
Set the calibrator to Standby mode (STBY).
5.
Disconnect the NI 9775 from the calibrator.
DC Accuracy Adjustment
Complete the following procedure to adjust the DC accuracy performance of the NI 9775.
1.
Set the calibrator to Standby mode (STBY).
2.
Connect the NI 9775 to the calibrator as shown in the
AC Accuracy Verification
section.
3.
Adjust the NI 9775.
a)
Initialize a calibration session on the NI 9775. The default password is
NI
.
b)
Input the external temperature in degrees Celsius.
c)
Call the NI 9775 get C Series adjustment points function with coupling mode set to
DC to obtain an array of recommended calibration voltages for the NI 9775.
d)
Set the calibrator to a reference value determined by the array of recommended
calibration voltages.
e)
Set the calibrator to Operate mode (OPR).
f)
Call and configure the NI 9775 adjustment function according to the following table.
Table 13. NI 9775 DC Adjustment Configuration
Physical Channel
Coupling Mode
Reference Value
cDAQMod8/AI0:3
DC
The output voltage setting of the calibrator
g)
Set the calibrator to Standby mode (STBY).
h)
Repeat steps d through g for each calibration voltage in the array.
i)
Close and commit the calibration session.
j)
Clear the task.
4.
Disconnect the NI 9775 from the calibrator.
NI 9775 Calibration Procedure
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