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imc C-SERIES - Manual, Version 4 R 3 - 2018-10-19

117CS-7008-FD, CL-7016-FD

5.8.3 Current measurement

5.8.3.1 Differential current measurement

For current measurement could be used the DSUB plug

ACC/DSUBM-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 and -VB.

Note

Since this procedure is a voltage measurement at the shunt resistor, voltage measurement must

also be set in the imc DEVICES interface.

The scaling factor is entered as 1/R and the unit as A (0.02 A/V = 1/50 Ω).

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