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NI 9218 Calibration Procedure
6.
Acquire and average samples.
a.
Create an AI voltage task on the NI 9218 according to Table 5.
b.
Configure the AI voltage task timing according to Table 6.
c.
Start the task.
d.
Average the readings and record the average.
e.
Stop and clear the task.
7.
Set the calibrator to Standby mode (STBY).
8.
Compare the average to the limits in Table 7.
9.
Repeat steps 3 through 8 for each test point in Table 7.
Note
The test limits listed in Table 7 are derived using the values in Table 32.
Note
The uncertainty of the calibration standard is not included in these limits.
10. Disconnect the calibrator from the device.
Table 5.
NI 9218 Configuration for Accuracy Verification
Min (V)
Max (V)
Scaled Units
Channel Configuration
-60
60
Volts
DC Coupled
Table 6.
NI 9218 Timing Configuration
Sample Mode
Samples Per Channel
Rate (kHz)
Finite Samples
512 k
51.2
Table 7.
NI 9218 Verification Test Limits for Accuracy
Test Point
2-Year Limits
Location
Value (V)
Lower Limit (V)
Upper Limit (V)
Max
50
49.827
50.173
Mid
0
-0.008
0.008
Min
-50
-50.173
-49.827
