NI 9229 - Page 6

NI 9229/9239 Calibration Procedure | © National Instruments | 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 Vo l t s Differential
9239 AI0:3 -10 10 Vo l t s 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