NI PXIe-4154 Calibration Procedure
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© National Instruments Corporation
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11
Note
The zero current test point is verified only with the measurement returned by
the NI PXIe-4154. To ensure no current is flowing while taking this zero current
measurement, disconnect all external equipment from the I/O connector and take a
current measurement with the NI PXIe-4154. When you verify zero current test
points this way, the measured current is always zero.
Note
After requesting a new current, wait one second to take a measurement with
an external DMM and NI PXIe-4154 to ensure the system has adequate time to settle.
The verification limits for current measurement depend on the actual current measured with an
external DMM, and are expressed as a percentage of DMM reading plus offset current. Refer to
Table 5 for more information.
Figure 5.
Current Measurement Verification Connection Diagram
Using External Current Source with 100 m
Ω
Precision Shunt
NI PXIe-4154
Sense –
Sense +
Output –
DMM
Voltage
Mode
+
–
Precision
100 m
Ω
Shunt
I
2
S
2
I
1
S
1
External
Current
Source
+
–
