© 2018 imc Test & Measurement GmbH
imc C-SERIES - Manual, Version 4 R 3 - 2018-10-19
91CS-1208-FD
5.4.2 Current measurement
·
Current: e.g. ±50 mA to ±1 mA
For current measurement, the DSUB connector ACC/DSUBM-I4 must be used. This plug is not included in
the standard package. It contains a 50 Ω shunt.
In addition, voltage can be measured via an externally connected shunt. The appropriate scaling must be
set in the user interface. The value 50 Ω is only a suggestion. The resistance should be sufficiently precise.
Make note of the shunt's power consumption.
In this configuration, too, the maximum common
mode voltage must be located within the range:
±10 V. This can generally only be assured if the
current source is also already referenced to
ground.
If the current source has no ground reference,
there is a danger of the unit suffering
unacceptably high overvoltage. It may be
necessary to create a ground reference, for
instance, by grounding the current source.
Since this procedure is a voltage measurement at the shunt resistor, voltage measurement must also be
set in the imc operating software.
The scaling factor is entered as 1/R and the unit as A (0.02 A/V = 1/50 Ω).
5.4.3 Current fed sensors
At the connection sockets, a permanent 5 V supply voltage for external sensors or for the ICP
expansion plugs ACC/DSUB-ICP and ACC/DSUB-ICP4 is available. This voltage source is grounded to
the measurement device's frame.
The description of measurement with ICP sensors is presented here.
5.4.4 Bandwidth
The channels' max. sampling rate is 100 kSamples/s (10
m
s sampling interval). The analog bandwidth is
48 kHz (-3 dB).
5.4.5 Connection
Please find here the DSUB-15 pin configuration .
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