Single-Ended Connections For Floating Signal Sources (Rse Configuration); Single-Ended Connections For Grounded Signal Sources (Nrse Configuration); Figure 4-7. Single-Ended Input Connections For Nonreferenced Or Floating Signals - National Instruments 6023E User Manual

Chapter 4 Signal Connections
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Floating
Signal
V
s
Source
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I/O Connector
6023E/6024E/6025E User Manual
Single-Ended Connections for Floating Signal
Sources (RSE Configuration)
Figure 4-7 shows how to connect a floating signal source to a channel
configured for RSE mode.
ACH
Input Multiplexers
AISENSE
AIGND
Selected Channel in RSE Configuration

Figure 4-7. Single-Ended Input Connections for Nonreferenced or Floating Signals

Single-Ended Connections for Grounded Signal
Sources (NRSE Configuration)
To measure a grounded signal source with a single-ended configuration,
you must configure your device in the NRSE input configuration. Connect
the signal to the positive input of the PGIA, and connect the signal local
ground reference to the negative input of the PGIA. The ground point of the
signal, therefore, connects to the AISENSE pin. Any potential difference
between the device ground and the signal ground appears as a
common-mode signal at both the positive and negative inputs of the PGIA,
and this difference is rejected by the amplifier. If the input circuitry of a
device were referenced to ground, in this situation as in the RSE input
configuration, this difference in ground potentials appears as an error in the
measured voltage.
Programmable Gain
Instrumentation Amplifier
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PGIA
–
4-18
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Measured
V
m
Voltage
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