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4.2.6 Isolated Grounds / Single-Ended Inputs
Single-ended inputs can be used to monitor isolated inputs, though the use of the differential mode will increase your
system’s noise immunity. The diagram below shows the recommended connections in this configuration.
4.2.7 Isolated Grounds / Differential Inputs
Optimum performance with isolated signal sources is ensured with the use of the differential input setting. The
diagram below shows the recommend connections in this configuration.
15
System with a Lar
g
e Common Mode Volta
g
e,
Connected to a Differential Input
L
arge com
m
on
mode voltage
between signal
source & A/D board
GND
Isolation
Barrier
When the voltage difference
between signal source and
A/D board ground is large
enough so the A/D board’s
common mode range is
exceeded, isolated signal
conditioning must be added.
+
-
Input
Amp
To A/D
A/D Board
I/O
Connector
LL GND
CH High
CH Low
10 K
10K is a recommended value. You may short LL GND to CH Low
instead, but this will reduce your system’s noise immunity.
Isolated Si
g
nal Source
Connected to a Sin
g
le-Ended Input
I/O
Connector
+
-
Input
Amp
To A/D
LL GND
CH IN
A/D Board
Isolated
signal
source
+
-
Input
Amp
To A/D
A/D Board
I/O
Connector
LL GND
CH High
CH Low
Signal Source
and A/D Board
Already Isolated.
Alread
y
isolated si
g
nal source
and A/D board connected to
a differential input.
GND
These grounds are
electrically isolated.
10 K
10K is a recommended value. You ma
y
short LL GND to CH Low
instead, but this will reduce
y
our s
y
stem’s noise immunit
y
.