User`s guide

Signal Connections
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23
Referenced Single-ended (RSE) Mode
In referenced single-ended mode, all the input signals are connected to the
ground provided by the DAQ-2213/2214. It is suitable for connections with
floating signal sources. See Figure 7. Note that when more than two
floating sources are connected, these sources will be referenced to the
same common ground.
A
In
A
IGND
n = 0, ...,15
Floating
Signal
Source
Instrumentation
A
mplifier
To A/ D
Converter
Input Multiplexer
V1
V2
+
-
+
-
CN1
Figure 7: Floating source and RSE input connections
Non-Referenced Single-ended (NRSE) Mode
To measure ground-referenced signal sources that are connected to the
same ground point, connect the signals in NRSE mode. Figure 8 illustrates
this connection. The signal’s local ground reference is connected to the
negative input of the instrumentation Amplifier (AISENSE pin on connector
CN1), and the common-mode ground potential between signal ground and
the ground on board will be rejected by the instrumentation amplifier.
Figure 8: Ground-referenced sources and NRSE input connections
A
In
A
ISENSE
n = 0, ...,15
Ground-
Referenced
Signal Source
Instrumentation
A
mplifier
To A/ D
Converter
Input Multiplexer
V1
V2
+
-
+
-
V
cm
Common-
mode noise &
Ground
potential