IMC C SERIES User Manual page 106

106 Device description
5.7.3 Current measurement
The current measurement is realized with shunt connector or with ground reference via the internal
quarter bridge completion.
5.7.3.1 Differential current measurement
·
Current ±50 mA to ±1 mA
Since in this procedure a voltage measurement at the shunt resistor is involved, it is necessary to
configure the imc software for voltage measurement. The scaling factor is entered as 1/R and the unit
set is A (0.02 A/V = 1/50 Ω).
© 2018 imc Test & Measurement GmbH
Note
Only for modules with DSUB connector!
For current measurement could be used the DSUB plug
ACC/DSUB(M)-I2. That connector comes with a 50 Ω
shunt and is not included with the standard package. It is
also possible to measure a voltage via an externally
connected shunt. Appropriate scaling must be set in the
user interface. The value 50 Ω is just a suggestion. The
resistor needs an adequate level of precision. Pay
attention to the shunt's power consumption.
The maximum common mode voltage must be in the
range ±10 V for this circuit, too. This can generally only be
ensured if the current source itself already is referenced
to ground. If the current source is ungrounded a danger
exists of exceeding the maximum allowed overvoltage for
the amplifier. The current source may need to be
referenced to the ground, for example by being grounded.
The sensor can also be supplied with a software-specified
voltage via Pins +VB(C) and -VB(D).
Note
imc C-SERIES - Manual, Version 4 R 3 - 2018-10-19