Figure 4.
Measurement Error Introduced by Common-Mode Bias
Current
NI 9234
AI+
AI-
+
–
Signal
Source
AI– Lead
Impedance
Common
Mode
Bias
Current
IEPE Excitation Current
The NI 9234 can also provide an IEPE excitation current for each
channel to measure ground-referenced or floating IEPE sensors.
Typical IEPE sensors have a case that is electrically isolated from
the IEPE electronics, so connecting the sensor to the NI 9234
results in a floating connection even though the case of the sensor
is grounded.
You can enable excitation current on a per-channel basis. Refer to
your software help for more information about excitation current.
14
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ni.com
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NI 9234 Getting Started Guide
