Kipp&Zonen COMBILOG Data Logger - Manual (Page 39)

5.1.2 Current Measurement
For current measurement the current source is connected
between an analogue input (In+) and analogue ground (A
GND
).
The load required for measurement is controlled by an internal
resistor R
int
to 100 Ω . The power capacity of this shunt is lim-
ited to 125 mW. This results in a measuring range of 25 mA
maximum.
Higher currents can be measured by means of an external res-
istor which is connected parallel to the current source to the
analogue signal input and analogue ground (A
GND
). The power
capacity of this external shunt has to be adapted to the current
source to be measured, so that the voltage occurring at the
analogue input does not exceed +10 V. The analogue input is
configured as voltage input. The voltage has to be divided by
R
ext
.
Note: The precision of the current measurement with external
shunt depends on the precision of the resistor being used.
Note: The input resistance of the current measurement chan-
nel depends on the current to measure!
Hardware Manual COMBILOG 1022
39