268 Properties of the Modules
imc CANSAS Users Manual - Doc. Version 1.9 - 05.12.2014© 2014 imc Meßsysteme GmbH
The voltage source itself already has a connection to the imc CANSAS-module's ground. The potential
difference between the voltage source and the imc CANSAS ground must be fixed.
The standard DSUB is called ACC/DSUB-U4 .
Example: The imc CANSAS-module is grounded. Thus, the input D is also at ground potential. If the
voltage source itself is also grounded, it's referenced to the imc CANSAS ground. It doesn't matter if the
ground potential at the voltage source is slightly different from that of the device itself. But the
maximum allowed common mode voltage must not be exceeded.
If the voltage source has no ground reference: The voltage source's potential floats freely in relation to
imc CANSAS ground. In such a case, a reference to ground must be set up. One way to do this is to
ground the voltage source itself. It is also possible to connect the negative signal input to imc CANSAS'
ground, in other words, connect "-in" and GND. You must make certain that the signal source's potential
really can be adjusted to the potential of imc CANSAS ground without causing a significant current to
flow. If the source can't be adjusted (because it is fixed), the imc CANSAS unit is in danger of sustaining
permanent damage.
6.4.2 Current measurement
±40 mA ... ±2 mA
For current measurement, a shunt is built into the imc
current connector (ACC/DSUB-I4).
The terminal “(GND)” may not be connected, and particularly not grounded!
With the housing model SL with LEMO connectors, current measurement is connected via an internal
50 shunt. Toward this end, the current signal is connected at the pins +I and -IN. For current
measurement, the pins +I and +IN must be shorted. This connection may only be made for current
measurement purposes, and must be cleared for all other measurement types. For this reason imc offers
a cable specially constructed with this connection exclusively for current measurement.
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