Table 10. NI 9775 Verification Limits for DC Accuracy (Continued)
Channel Property Settings
Test Point
1-Year Limits (V)
ADC Timing Mode
Analog Lowpass
Filter
Location Value Upper Limit Lower Limit
High Resolution
Enabled
Min
-10.000
-9.931
-10.069
Mid
0.000
0.015
-0.015
Max
10.000
10.069
9.931
Note
The test limits in this table are derived using the values in the
NI 9775
Accuracy Under Calibration Conditions
table.
Note
The uncertainty of the calibration standard is not included in these
limits.
7.
Set the calibrator to Standby mode (STBY).
8.
Repeat steps 3 through 7 for each test point in the
NI 9775 Verification Limits for DC
Accuracy
table.
9.
Repeat steps 3 through 8 for each channel configuration in the
NI 9775Channel
Properties Configuration for DC Accuracy Verification
table.
10. Disconnect the NI 9775 from the calibrator.
Adjustment
The following performance adjustment procedure describes the sequence of operation required
to adjust the NI 9775.
AC Accuracy Adjustment
Complete the following procedure to adjust the AC accuracy performance of the NI 9775.
Note
Adjust AC accuracy first, then DC accuracy. Always adjust DC accuracy
whenever you adjust AC accuracy.
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 with the DAQmx Set Temperature
C Series Function.
c)
Call the NI 9775 get C Series adjustment points function with coupling mode set to
AC to obtain an array of recommended calibration frequency points for the NI 9775
Accuracy Adjustment.
d)
Set the calibrator to a frequency value determined by the array or recommended
calibration frequency points. The AC voltage amplitude should be the value as
shown in the following table.
6
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NI 9775 Calibration Procedure
