National Instruments AT E Series Differential Connections for Ground-Referenced Signal Sources

Chapter4 ConnectingSignals
©NationalInstruments Corporation 4-21 ATE Series User Manual
Differential Connections for Ground-Referenced
Signal Sources
Figure 4-6 shows how to connect a ground-referenced signal source to
an ATE Series device channel configured in DIFF input mode.
Figure4-6. Differential Input Connections for Ground-Referenced Signals
Withthis type of connection, the PGIA rejects both the common-m ode
noise in the signal and the ground potential difference between the signal
sourcean dthe AT E Series device ground, shown as Vcm in Figure 4-6.
SelectedChannel in DIFF Configuration
PGIA
Programmable
Gain
Instrumentation
Amplifier
+
+
–
–
+
–
InputMultiplexers
AISENSE
AIGND
I/OConnector
Vcm
+
–
Vs
ACH+
ACH–
Vm
Common-
Mode
Noiseand
Ground
Potential
Ground-
Referenced
Signal
Source
Measured
Voltage