NI 9229/9239 Calibration Procedure
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© National Instruments
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5
5.
Acquire and average samples.
a.
Create and configure an AI voltage task on the NI 9229/9239 according to Table 2.
b.
Configure the AI voltage task timing according to Table 3.
c.
Start the task.
d.
Read samples from the NI 9229/9239.
e.
Average the samples per channel.
f.
Clear the task.
6.
Compare the per channel average to the limits in Table 4 or Table 5.
Note
The test limits listed in Table 4 and 5 are derived using the values in Table 14.
Table 2.
NI 9229/9239 Configuration for Accuracy Verification
Module
Physical
Channels
Min (V)
Max (V)
Scaled
Units
Terminal
Configuration
9229
AI0:3
-60
60
Volts
Differential
9239
AI0:3
-10
10
Volts
Differential
Table 3.
NI 9229/9239 Timing Configuration
Sample Mode
Samples Per Channel
Rate
Finite Samples
2000
8330
Table 4.
NI 9229 Verification Test Limits for Accuracy
Range
Test Point
1-Year Limits
Min (V)
Max (V)
Location
Value (V)
Lower Limit (V)
Upper Limit (V)
-60
60
Max
57.00000
56.9695
57.0304
Mid
0.00
-0.00766
0.00766
Min
-57.00000
-57.0304
-56.9695
Table 5.
NI 9239 Verification Test Limits for Accuracy
Range
Test Point
1-Year Limits
Min (V)
Max (V)
Location
Value (V)
Lower Limit (V)
Upper Limit (V)
-10
10
Max
9.50000
9.4948
9.50515
Mid
0.00
-0.00135
0.00135
Min
-9.50000
-9.50515
-9.4948
