NI 9218 Calibration Procedure
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© National Instruments
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11
6.
Acquire and average samples.
a.
Create an AI voltage task on the NI 9218 according to Table 11.
b.
Configure the AI voltage task timing according to Table 12.
c.
Start the task.
d.
Average the readings and record the averages.
e.
Stop and clear the task.
7.
Set the calibrator to Standby mode (STBY).
8.
Compare the averages to the limits in Table 13.
9.
Repeat steps 3 through 8 for each test point in Table 13.
Note
The test limits listed in Table 13 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 11.
NI 9218 Configuration for Accuracy Verification
Min (mV)
Max (mV)
Scaled Units
Channel Configuration
-65
65
Volts
DC Coupled
Table 12.
NI 9218 Timing Configuration
Sample Mode
Samples Per Channel
Rate (kHz)
Finite Samples
512 k
51.2
Table 13.
NI 9218 Verification Test Limits for Accuracy
Test Point
2-Year Limits
Location
Value (mV)
Lower Limit (mV)
Upper Limit (mV)
Max
50
49.906
50.094
Mid
0
-0.024
0.024
Min
-50
-50.094
-49.906