Figure 4. Voltage Remote Sense Diagram, LO Sense Verification Assembly
NI-DCPower Device
Sense LO
Sense HI
(triax)
HI
(triax)
LO
CHS GND
LO Sense Verification Assembly
Verifying Current Offset Null
Remove all connections from the PXIe-4135 and confirm that the current measured into an
open circuit falls within the test limits.
Complete this procedure only after successfully completing all previous verification
procedures. Verify level ranges in the order listed in the table.
Refer to the following table as you complete the following steps:
Table 5. Current Offset Null Verification
Level Range
Limit Range
Limit
Test Point
As-Found/As-Left Offset Test Limit
600 mV
10 nA
10 nA
0 mV
750 fA
3
1.
Disconnect all equipment from the output of the PXIe-4135.
2.
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.
3.
Wait 30 seconds for thermal EMF to stabilize.
4.
Set the
niDCPower Aperture Time
property or
NIDCPOWER_ATTR_APERTURE_TIME
attribute to 10 power-line cycles (PLCs) on the
PXIe-4135.
3
Accuracy specifications typical for Revision E and earlier of the PXIe-4135.
12
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PXIe-4135 Calibration Procedure
