over time. NI uses these limits to reduce the probability that the instrument will be outside the
published specification limits at the end of the calibration cycle. Use the as-left limits when
performing verification after adjustment.
Verification
The following performance verification procedures describe the sequence of operation and
provide test points required to verify the NI PXIe-7865/7866. The verification procedures
assume that adequate traceable uncertainties are available for the calibration references.
Analog Input Accuracy Verification
Complete the following procedure to determine the As-Found status of the NI
PXIe-7865/7866.
1.
Connect the NI R Series device to the calibrator as shown in the following figure.
Figure 1. Analog Input Verification Connections
Calibrator
HI
LO
AI1
–
+
AI0
–
+
2.
If your calibrator has a guard connection, connect that terminal to AI GND.
3.
Set the calibrator voltage to a Test Point value indicated in the appropriate
Analog Input
Accuracy Verification Test Limits
table in the
Test Limits
section of this document.
4.
Measure the analog input voltage on each channel by calling
nirio78xxCalibrationReadAIVoltage.vi
.
5.
Compare the measured voltage with the 1-year limits from the appropriate
Analog Input
Accuracy Verification Test Limits
table to verify the input accuracy. If the value is within
these limits, the device passes the test.
6.
Repeat steps 3 through 5 for each test point in the following
Analog Input Accuracy
Verification Test Limits
table.
4
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NI PXIe-7865 and NI PXIe-7866 Calibration Procedure
