434 Properties of the Modules
imc CANSAS Users Manual - Doc. Version 1.9 - 05.12.2014© 2014 imc Meßsysteme GmbH
The differential input impedance for measurement of voltages from ±60 V to ±2 V is 900 k ; for
measurement of voltages from ±1 V to ±100 mV it is 5 M .
The input is DC-coupled. The differential behavior is achieved due to the insulated design.
For voltage measurement in which zero-balancing (taring) is not permitted, the setting No function
should be selected as the status display for For "Not balanced" in the LED dialog. Otherwise, the
setting for the selected LEDs’ behavior in normal operation mode is not displayed.
6.21.2 Voltage measurement: With zero-adjusting
In the measurement mode Voltage: allow zero-balance it is possible to perform balancing (taring) of the
value measured.
This is accomplished either by means of the channel menu command Perform balancing for selections in
the Measurement window or on the page Balance under the module node Special Functions.
The initial offset may be many times the input range. If the initial offset is too large for compensation by
the device, a larger input range must be set.
Compensable initial offset* [V]
Compensable initial offset* [V]
*The maximum initial unbalance is the difference between the input range set and the possible input range. For
instance, if the actual range for a setting of 50 V is 70 V and the one for the 20 V setting is 35 V, then the resulting
possible initial unbalance is 20 V in the 50 V input range and 15 V in the 20 V input range.
The Balance dialog is located in the node Special Functions. It enables automatic balancing each time the
device is activated. You can also store the balancing values in the module permanently, so that they are
not lost as soon as the device is deactivated. It is also possible to perform a balancing procedure at a
specific point in time as desired.
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