Connections For Ground-Referenced Signal Sources - National Instruments NI 6115/6120 User Manual

Connections for Ground-Referenced Signal Sources

Ground-
+
Referenced
V
s
Signal
–
Source
Common-
+
Mode
V
Noise and
cm
Ground
–
Potential
I/O Connector
© National Instruments Corporation
Figures 4-2 and 4-3 show how to connect a ground-referenced signal
source to a channel on the NI 6115 and NI 6120, respectively.
Common-Mode
Choke
ACH0+
ACH0–
ACH0GND
ACH0 Connections Shown
Figure 4-2. Pseudodifferential Input Connections on the NI 6115
AC Coupling
*
*
100 pf
1 M
10 nf
for Ground-Referenced Signals
4-9
Chapter 4 Connecting Signals
Instrumentation
Amplifier
+
PGIA
+
–
V
m
–
*
10 kΩ40 pf for ranges > ±10 V
NI 6115/6120 User Manual
Measured
Voltage