NI PXIe-4339 Calibration Procedure
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© National Instruments
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7
Voltage Mode Accuracy Verification
Complete the following steps to verify the voltage mode accuracy of the NI PXIe-4339.
1.
Set the calibrator to standby mode (STBY).
2.
Connect the calibrator to the TB-4339/B/C as shown in Figure 2.
•
If the calibrator has a guard connection, leave it disconnected.
•
If the calibrator output is floating, you must connect the negative output to AIGND.
3.
Set the calibrator voltage output to a
Test Point
value for the appropriate
Range
shown in
Table 4, beginning with the values in the first row.
For the first test point, set the calibrator to operate mode (OPR) to enable output.
4.
Acquire a voltage measurement with the NI PXIe-4339.
a.
Create a DAQmx task.
b.
Create and configure the AI channel according to the values shown in Table 3.
c.
Start the task.
d.
Average the readings that you acquired.
e.
Clear the task.
f.
Compare the resulting average to the
Lower Limit
and
Upper Limit
values in Table 4.
If the result is between these values, the device passes the test.
Table 3.
AI Voltage Mode Setup
Configuration
Value
Channel Name
Dev1/ai
x
, where
x
refers to the channel number
Task
AI Voltage
Sample Mode
Finite number of samples
Sample Clock Rate
100
Samples Per Channel
100
Maximum Value
Appropriate maximum range value from Table 4
Minimum Value
Appropriate minimum range value from Table 4
Units
Volts
Table 4.
Voltage Mode Accuracy Limits
Range (V)
Test Point (V)
Lower Limit (V)
Upper Limit (V)
Minimum
Maximum
-0.1
0.1
-0.095
-0.095131
-0.094869
-0.1
0.1
0
-0.000074
0.000074
