IMC CANSAS - Voltage Source at a Different Fixed Potential; Voltage Measurement: with Zero-Adjusting (Tare)

UNI8: universal 411
imc CANSAS Users Manual - Doc. Version 1.9 - 05.12.2014© 2014 imc Meßsysteme GmbH
6.20.1.3 Voltage source at a different fixed potential
The common mode voltage (Ucm) has to be less than ±10 V. It is reduced
by ½ input voltage.
Example: Suppose a voltage source is to be measured which is at a
potential of 120 V to ground. The system itself is grounded. Since the
common mode voltage is greater than permitted, measurement is not
possible. Also, the input voltage difference to the amplifier ground would
be above the upper limit allowed. For such a task, the UNI8 cannot be
used!
6.20.1.4 Voltage measurement: with zero-adjusting (tare)
In voltage measurement, it is possible for the sensor to have an initial offset from zero. For such cases,
use the operating software to select the measurement mode "Voltage enable offset calibration" for the
desired channel. The input range will be reduced by the initial offset. If the initial offset is too large for
compensation by the device, a larger input range must be set.
Measurement range [V]
Compensable initial
offset* [V]
Measurement range [V]
Compensable initial
offset* [V]
±50
8.4
±0.5
0.08
±20
38.4
±0.2
0.3
±10
1.6
±0.1
0.015
±5
6.5
±0.05
0.06
±2
0.9
±0.02
0.008
±1
1.9
±0.01
0.018
±0.005
0.023
*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 and of 20 V is 58.4 V, then the resulting possible initial unbalance is
8.4 V in the 50 V input range and 38.4 V in the 20 V input range.
For notes on triggering the adjustment, refer to the section on bridge measurement .
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