Measurement Computing CIO-DAS08-PGH - Manual (Page 16)

3.2.6 Isolated Grounds / Single-Ended Inputs
Single-ended inputs can be used to monitor isolated inputs, though the use of the differential mode will increase you system’s
noise immunity. Figure 3-9 below shows the recommended connections is this configuration.
Figure 3-9 . Isolated Grounds - Single-Ended Inputs
3.2.7 Isolated Grounds / Differential Inputs
Optimum performance with isolated signal sources is assured with the use of the differential input setting. Figure 3-10 shows the
recommend connections is this configuration..
Figure 3-10. Isolated Grounds - Differential Inputs
12
Iso lated S ign al S ou rce
C on ne cte d to a Single-E nd ed In pu t
I/O
C o nn ector
+
-
Inp ut
A m p
To A /D
L L G N D
C H IN
A /D B o a rd
Is o la t
ed
s ig n a
l
s
ou rc e
+
-
In p u t
A m p
To A /D
A /D B o a rd I/O
C o n n e cto r
LL G N D
C H H igh
C H L ow
S ig n
a l S o
u rce
a n d A
/D B o
a rd
A
lrea d
y Iso
la ted
.
A lre a d y iso la te d s ig na l so u rc e
a n d A /D b o a rd co n n e c te d to
a d iffe re n tia l in p u t.
G N D
T he se g ro u n d s are
e le ctrica lly iso la te d .
1 0 K
1 0 K is a r e 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 y o u r s y s te m ’s n o ise im m u n ity.