ADLINK PXI-2208 - Manual (Page 42)

30 Signal Connections
Referenced Single-ended (RSE) Mode
In referenced single-ended mode, all input signals are con-
nected to the ground provided by the DAQ-/DAQe-/PXI-2204/
2205/2206/2208 card. This is suitable for connections with
floating signal sources. Figure 3-1 shows an illustration. Note
that when more than two floating sources are connected, these
sources will be referenced to the same common ground.
Figure 3-1: Floating Source and RSE Input Connections
Non-Referenced Single-ended (NRSE) Mode
To measure ground-referenced signal sources, which are con-
nected to the same ground point, you can connect the signals
in NRSE mode. Figure 3-2 illustrates the connection. The sig-
nals local ground reference is connected to the negative input
of the instrumentation Amplifier (AISENSE pin on CN1 connec-
tor), and the common-mode ground potential between signal
ground and the ground on board will be rejected by the instru-
mentation amplifier.
Figure 3-2: Ground-referenced Sources and NRSE Input Connections
AIn
AIGND
n = 0, ...,63
Floating
Signal
Source
Instrumentation
Amplifier
To A/D
Converter
Input Multipexer
V1 V2
+
-
+
-
CN1
AIn
AISENSE
n = 0, ...,63
Ground-
Referenced
Signal Source
Instrumentation
Amplifier
To A/D
Converter
Input Multipexer
V1 V2
+
-
+
-
V
cm
Common-
mode noise &
Ground
potential