282 Properties of the Modules
imc CANSAS Users Manual - Doc. Version 1.9 - 05.12.2014© 2014 imc Meßsysteme GmbH
6.5.4 Resistance measurement
For resistance measurement there are four input ranges: 0 to 1000 ,
500 , 250 and 150 . Each resistor is fed by a separate current source
with approx. 250µA. The measurement uses 4-wire configuration.
The resistor is supplied by 2 lines (+I, -I). The other two measurement
inputs (+IN, -IN) serve as Sense-leads. By using the Sense-leads, the
voltage at the resistor itself can be determined precisely. The voltage
drop along the conducting cable thus does not cause any measurement
error.
Probe-breakage recognition:
The indicated measurement value changes to zero if the connection between I+ and IN+ is broken. If only
the connection to the resistor at IN+ is broken, the indicated value is the input range end value.
6.5.5 Optional sensor supply module
The CI8 can be enhanced with the sensor supply unit SUPPLY, which provides an adjustable supply
voltage for active sensors.
The supply outputs are electronically protected internally against short circuiting to ground. The
reference potential, in other words the sensor's supply ground contact, is the terminal GND. For the imc
CANSAS-SL-CI8-L-SUPPLY there is only an unipolar voltage supply available.
For technical specification of the SUPPLY see here .
6.5.6 Allow overmodulation beyond input range
The option Allow overmodulation beyond input range on the Amplifier page of the dialog makes it
possible to exceed the input range by about 20 %. This applies globally for all of the module's channels
and for all measurement modes except for the temperature mode.
CI8 amplifier tab: Allow overmodulation beyond input range
518
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