15.1.4
Isolated balanced differential input
An isolated balanced differential input is isolated and uses balanced inputs.
Isolated measurement ground is not often available.
GND
U
in+
(–)
(+)
900 k
100 k
(+)
(–)
900 k
U
in–
U
diff
100 k
Isolated GND
U
iso
U
iso
Non-isolated
system
Figure 15.6:
Isolated balanced differential amplifier
l
Resistance / Capacitance from each terminal to isolated measurement
ground is identical
l
There is an ISOLATED MEASUREMENT GROUND
l
Used in GEN DAQ Universal amplifier
l
Typically identified by using two or three (isolated) connectors per
channel
Note
The isolated ground is not accessible in some designs
l
Cannot be used with probes as there is no ground reference for probes to
divide the voltage
GEN3i
344
I3763-3.1 en HBM: public
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