Table 7. NI 9775 Configuration for DC Accuracy Verification
Physical Channels
Min (V)
Max (V)
Terminal Configuration
Scaled Units
cDAQMod8/AI0:3
-10
10
RSE
Volts
b)
Configure the AI voltage task timing according to the following table.
Table 8. NI 9775 Timing Configuration for DC Accuracy Verification
Sample Mode
Samples per Channel
Rate
Finite Sample
10,000
20 MS/s
c)
Configure each test point according to the channel property settings in the following
table.
Table 9. NI 9775 Channel Properties Configuration for DC Accuracy Verification
AI.ADCTimingMode
AI.Lowpass Enable
High Speed
False
High Speed
True
High Resolution
True
d)
Start the task.
e)
Read the samples from the NI 9775.
f)
Average the readings.
g)
Stop and clear the task.
6.
Compare the per-channel averages to the limits in the following table.
Table 10. NI 9775 Verification Limits for DC Accuracy
Channel Property Settings
Test Point
1-Year Limits (V)
ADC Timing Mode
Analog Lowpass
Filter
Location Value Upper Limit Lower Limit
High Speed
Disabled
Min
-10.000
-9.931
-10.069
Mid
0.000
0.015
-0.015
Max
10.000
10.069
9.931
High Speed
Enabled
Min
-10.000
-9.931
-10.069
Mid
0.000
0.015
-0.015
Max
10.000
10.069
9.931
NI 9775 Calibration Procedure
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© National Instruments
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