NI 9222/9223 Calibration Procedure
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© National Instruments
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5
6.
Compare the average to the limits in Tables 4 or 5.
Note
The test limits listed in Tables 4 or 5 are derived using the values in Table 7.
7.
Set the calibrator to Standby mode (STBY).
8.
Repeat steps 3 through 6 for each test point.
9.
Disconnect the calibrator from the device.
10. Repeat steps 2 through 9 for each channel.
Adjustment
The following performance adjustment procedure describes the sequence of operation required
to adjust the NI 9222/9223.
Accuracy Adjustment
Complete the following procedure to adjust the accuracy performance of the NI 9222/9223.
1.
Set the calibrator to Standby mode (STBY).
2.
Connect the NI 9222/9223 to the calibrator as shown in Figure 1.
Note
If the calibrator outputs are truly floating, the negative output must be
connected to a quiet earth ground as well as AI- to give the entire system a ground
reference.
Table 4.
NI 9222 Verification Limits for Accuracy
Range (V)
Test Point
1-Year Limits (V)
Minimum
Maximum
Location
Value (V)
Lower Limit
Upper Limit
-10.000
10.000
Positive FS
9.500000
9.494589
9.505411
-10.000
10.000
Mid
0.000000
-0.002466
0.002466
-10.000
10.000
Negative FS
-9.500000
-9.505411
-9.494589
Table 5.
NI 9223 Verification Limits for Accuracy
Range (V)
Test Point
1-Year Limits (V)
Minimum
Maximum
Location
Value (V)
Lower Limit
Upper Limit
-10.000
10.000
Positive FS
9.500000
9.493485
9.506515
-10.000
10.000
Mid
0.000000
-0.002430
0.002430
-10.000
10.000
Negative FS
-9.500000
-9.506515
-9.493485
