IDL 101
FUNCTIONAL DESCRIPTION
38
HB_IDL101_E_V222.doc
Gantner Instruments Test & Measurement GmbH
Measurement of Current:
Figure 6.3 Measurement of current with external shunt
For measurement of current with the
Datalogger IDL 101 the source of electricity is connected between an analog input
(AIn +) and analog ground (A
GND
). The load on the source of electricity that is required for the measuring is regulated
by an external resistor R
ext
to the amount of 50
Ω
. This results in a measuring range of up to 25 mA maximum.
Notice
: The precision of the current measurement with external shunt depends on the precision of the resistor that is
used.
S
O
U
R
C
E
A
In
+
A
In
-
S
O
U
R
C
E
A
In
+
A
In
-
A
GN
D
A
GN
D
1
2
Connection Scheme
Circuit
Measuring Current I
I = U / R
1
ext
I
R
ext
R
ext
AIn +
A
GND
External Shunt
U
1
