Hardware Manual COMBILOG 1020
44
Current Measurement
For current measurement the
current source
is
connected
be-
tween
an
analog
input
(In+) and analog 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 limited to 125 mW.
This results in a measuring range of 25 mA maximum.
Higher currents can be measured by means of an external resis-
tor which is connected parallel to the current source to the analog
signal input and analog 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 analog input does
not 10 V. The analog input is configured as voltage in-
put. 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 channel
depends on the current to measure!
Summary of Contents for COMBILOG 1020
Page 1: ...COMBILOG 1020 Datalogger Hardware Manual Version 3 09...
Page 2: ...Hardware Manual COMBILOG 1020 2 Issue 03 11 2005 Technical data are subject to change...
Page 4: ...Hardware Manual COMBILOG 1020 4...
Page 6: ...Hardware Manual COMBILOG 1020 6...
Page 12: ...Hardware Manual COMBILOG 1020 12...
Page 86: ...Hardware Manual COMBILOG 1020 86 Bild 8 1 Example Master Slave System...
Page 169: ...Hardware Manual COMBILOG 1020 169...
Page 170: ...Hardware Manual COMBILOG 1020 170...