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Floating
Signal
V
s
Source
–
I/O Connector
© National Instruments Corporation
Single-Ended Connections for Floating Signal Sources
(RSE Configuration)
Figure 3-5 shows how to connect a floating signal source to an
NI PCI-1200 configured for RSE mode. Configure the NI PCI-1200 AI
circuitry for RSE input to make these types of connections. Configuration
instructions are in the
Installing and Configuring the NI
1
ACH0
2
ACH1
3
ACH2
•
•
•
•
•
•
8
ACH7
9
AISENSE/AIGND
11
AGND
NI PCI-1200 in RSE Configuration
Figure 3-5. Single-Ended Input Connections for Floating Signal Sources
Single-Ended Connections for Grounded Signal Sources
(NRSE Configuration)
If you measure a grounded signal source with a single-ended configuration,
configure the NI PCI-1200 in the NRSE input configuration. The signal is
connected to the positive input of the NI PCI-1200 instrumentation
amplifier and the signal local ground reference is connected to the negative
input of the NI PCI-1200 instrumentation amplifier. Therefore, connect the
ground point of the signal to the AISENSE pin. Any potential difference
between the NI PCI-1200 ground and the signal ground appears as a
common-mode signal at both the positive and negative inputs of the
instrumentation amplifier and is therefore rejected by the amplifier. On the
other hand, if the input circuitry of the NI PCI-1200 is referenced to ground,
Analog I/O Configuration
PCI-1200.
+
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3-13
Chapter 3
Signal Connections
section of Chapter 2,
+
Measured
V
m
Voltage
–
NI PCI-1200 User Manual
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