ADLINK USB-1903 - Manual (Page 40)

26 Hardware Information
This mode is suitable for connections with floating signal
sources.
Figure 2-15: Floating source w/ RSE input connections
Non-Referenced Single-End (NRSE) Mode
To measure ground-referenced signal sources connected to
the same ground point, connect the signals in NRSE mode, as
shown. The signals’ local ground reference is connected to the
negative input of the instrumentation amplifier (AISENSE pin
on CN1 connector), and the common-mode ground potential
between signal ground and the ground on board is rejected by
the instrumentation amplifier.
NOTE: NOTE:
When two or more floating sources are connected, these
sources will be referenced to the same common ground.
AIn
AIGND
n = 0, ...,63
Floating
Signal
Source
Instrumentation
Amplifier
To A/D
Converter
Input Multiplexer
V1 V2
+
-
+
-
CN1