Measurement Computing CIO-DAS6402/12 - Manual (Page 17)

Figure 4-9. Isolated Grounds / Single-Ended Input
4.2.7 ISOLATED GROUNDS / DIFFERENTIAL INPUTS
Optimum performance with isolated signal sources is assured with the use of the differential input setting. Figure 4-10 below shows
the recommend connections is this configuration.
Figure 4-10. Isolated Grounds / Differential Inputs
4.3 ANALOG OUTPUTS
Analog outputs are simple voltage outputs which can be connected to any device which will record, display or be controlled by a
voltage. The CIO-DAS6402 analog outputs are 4 quadrant multiplying DACs. This means that they accept an input voltage
reference and provide an output voltage which is inverse to the reference voltage and proportional to the digital value in the output
register.
For example, the supplied reference of
−5V provides a +5V output when the value in the output register is 4095 (full scale at
12-bits of resolution). It provides a value of 2.5V when the value in the output register is 2048.
The output ranges of the CIO-DAS6402/12 are set by software. The output ranges of the CIO-DAS6402/16 are set by dip switch.
Please refer to Section 3 for information regarding setting these switches.
13
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.