2.2.6 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. Figure 2-11 shows the recommended connections is this configuration.
Figure 2-11. Isolated Signal Source to Single-Ended Input
2.2.7 Isolated Grounds / Differential Inputs
Optimum performance with isolated signal sources is assured with the use of differential inputs. Figure 2-11 shows the recommended
connections for this configuration.
Figure 2-11. Isolated Signal Source Connected to a Differential Input
11
Iso lated S ignal S ource
C onne cte d to a S ingle-E nd ed Inpu t
I/O
C o n n e ctor
+
-
Inp ut
A m p
To A /D
LL GN D
CH IN
A /D B o a rd
Iso lat
ed
s
ig na l
so
urce
+
-
In p u t
A m p
To A /D
A /D B o a rd
I/O
C o n n e c to r
LL G N D
C H H igh
C H L ow
S ign a
l S o u
rce
an d A
/D B o
a rd
A
lrea d y
Iso la
ted .
A lrea d y iso la te d sig n a l so u rce
a nd A /D b oa rd co n n ec ted to
a diffe re n tia l in pu t.
G N D
T he se g ro u n ds are
e le ctrica lly isolate d .
1 0 K
1 0 K is a re c o m m e n d e d v a lu e . Yo u m a y s h o rt L L G N D to C H L o w
in s te a d , b u t th is w ill re d u c e yo u r s y s te m ’s n o ise im m u n ity.
