© 2018 imc Test & Measurement GmbH
imc C-SERIES - Manual, Version 4 R 3 - 2018-10-19
89CS-1016-FD
5.4 CS-1208-FD
CS-1208-FD is a 8-channel universal measurement device, respectively, for voltage and current
measurement tasks (20 mA), with sampling rates of up to 100 kHz per channel.
In particular, the high bandwidth of 48 kHz, the input ranges from 50 V to 5 mV and the low signal noise
predestine this device for high-performance voltage measurements.
Technical details: CS-1208-FD analog inputs .
5.4.1 Voltage measurement
·
Voltage: ±5 mV to ±50 V
In the voltage ranges ±50 V and ±20 V, a voltage divider is in operation; the resulting input impedance is
1 MΩ. In the voltage ranges ±10 V to ±5 mV, by contrast, the input impedance is 20 MΩ. When the device
is deactivated, it drops to about 1 MΩ.
The input configuration is differential and DC-coupled.
5.4.1.1 Voltage source with ground reference
The voltage source itself already is referenced to the device's ground. The voltage source is at the same
potential as the device ground.
The unit is grounded. Thus, the input GND is at
ground potential. If the voltage source itself is also
grounded, it is referenced to the device ground.
It isn't any problem if, as it may be, the ground
potential at the voltage source deviates from the
ground potential of the device itself by a few
degrees. The maximum permitted common mode
voltage must not be exceeded.
In this example, the negative signal input -IN may not be connected to the ground contact GND in the
device. Otherwise, a ground loop would result, through which interference could be coupled in.
In this case, a true differential (but not isolated!) measurement is performed.
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