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NI 9234 Calibration Procedure
d.
Average the readings and record the average.
e.
Compare the average to the limits in Table 4.
f.
Clear the task.
7.
Set the calibrator to Standby mode (STBY).
8.
Repeat steps 3 through 7 for each test point in Table 4.
Note
The test limits listed in Table 4 are derived using the values in Table 21.
9.
Disconnect the calibrator from the device.
10. Repeat steps 1 through 9 for each channel on the NI 9234.
Gain Matching Verification
Complete the following procedure to determine the As-Found status of the NI 9234.
1.
Set the calibrator to Standby mode (STBY).
2.
Connect the NI 9234 to the calibrator. Refer to Figure 2 for a connection diagram.
Figure 2.
Gain Matching Verification Connections to the NI 9234
3.
Verify that the calibrator output is not grounded (floating).
Notes
The analog inputs on the NI 9234 are grounded, so the calibrator must be
not grounded (floating) to prevent ground loop measurement errors.
To float the output of the Fluke 5700A, enable External Guard mode (EX GRD).
4.
Set the calibrator voltage to 4.0 V.
5.
Set the calibrator to Operate mode (OPR).
Table 4.
NI 9234 Verification Test Limits for Accuracy
Test Point
1-Year Limits
Location
Value (V)
Lower Limit (V)
Upper Limit (V)
Max
4.0
3.9952
4.0048
Mid
0.0
-0.0012
0.0012
Min
-4.0
-4.0048
-3.9952
NI 92
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Содержание NI 9234
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