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Table 2. Voltage Output and Measurement Verification
Level
Range
Limit
Range and
Limit
Test Point
As-Found
Measurement Test
Limit (% of V
Offset)
As-Left Measurement
Test Limit (% of Voltage
+ Offset)
600 mV
1 mA
-600 mV
0.016% + 30 μV
0.0065% + 25 μV
0 mV
600 mV
6 V
1 mA
-6 V
0.016% + 90 μV
0.0045% + 85 μV
0 V
6 V
60 V
1 mA
-60 V
0.016% + 900 μV
0.0065% + 820 μV
0 V
60 V
1.
Set the first specified level range, limit range, and limit on the PXIe-4139.
2.
Set the
niDCPower Sense
property or
NIDCPOWER_ATTR_SENSE
attribute to Local.
3.
Measure the internal device temperature and perform self-calibration if necessary.
a)
If the internal device temperature exceeds T
cal
±1 °C, wait up to five minutes for the
temperature to stabilize to within T
cal
±1 °C.
b)
If after five minutes the stable temperature still exceeds T
cal
±1 °C, call the self-
calibration VI or function.
4.
Set the level on the PXIe-4139 to the first specified test point.
5.
Compare a DMM voltage measurement to the voltage measurement test limits.
a)
Take a voltage measurement using the DMM.
b)
Calculate the lower and upper voltage measurement test limits using the following
formula:
Voltage Measurement Test Limits
=
Test Point
± (|
Test Point
| *
% of Voltage
+
Offset
)
c)
Verify the DMM measurement falls within the test limits.
6.
If more than one test point per level range is specified, repeat the previous steps for each
test point, from setting the level to the test point on the PXIe-4139 up to this step.
7.
If more than one level range is specified, repeat the previous steps using the values
specified in each level range.
NI PXIe-4139 Calibration Procedure
|
© National Instruments
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