5.
Measure the internal device temperature and perform self-calibration if necessary.
a)
After measuring the internal device temperature, wait for the internal device
temperature to stabilize. Temperature is considered stable when it has not changed
by more than ±1 °C in the previous 5 minutes.
b)
After the internal temperature has stabilized, if the temperature still exceeds
T
cal
± 1 °C, call the self-calibration VI or function.
6.
Set the level on the PXIe-4135 to the first specified test point.
7.
Take a voltage measurement using the PXIe-4135.
8.
Record the value from the previous step.
9.
Verify that the recorded value falls within the test limit listed in the table above.
10. Set the
niDCPower Sense
property or
NIDCPOWER_ATTR_SENSE
attribute to Remote.
Refer to the following table as you complete the following steps:
Table 8. Voltage Measurement Load Regulation Verification
Level Range
Limit Range and Limit
I1
I2
I3
As-Found/As-Left Limit
1 μA
6 V
-1 μA 1 μA 0 μA
±20 μV
11. Set the first specified level range, limit range, and limit on the PXIe-4135.
12. Measure the internal device temperature and perform self-calibration if necessary.
a)
After measuring the internal device temperature, wait for the internal device
temperature to stabilize. Temperature is considered stable when it has not changed
by more than ±1 °C in the previous 5 minutes.
b)
After the internal temperature has stabilized, if the temperature still exceeds
T
cal
± 1 °C, call the self-calibration VI or function.
13. Complete the following steps within five minutes or less to ensure the internal device
temperature remains stable:
a)
Set the level on the PXIe-4135 to the value specified by I1 in the table above.
b)
Take a voltage measurement using the PXIe-4135 and record the value as V1.
c)
Set the level on the PXIe-4135 to the value specified by I2 in the table above.
d)
Take a voltage measurement using the PXIe-4135 and record the value as V2.
e)
Set the level on the PXIe-4135 to the value specified by I3 in the table above.
f)
Take a voltage measurement using the PXIe-4135 and record the value as V3.
g)
Calculate the change in output voltage versus change in output current using the
following formulas:
Error 1
=
V
1 -
V
3,
Error 2
=
V
2 -
V
3
14. Record the values for
Error 1
and
Error 2
from the previous step.
15. Verify that both recorded values fall within the test limits listed in the table above.
16. Configure the PXIe-4135 output to disable.
PXIe-4135 Calibration Procedure
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© National Instruments Corporation
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