User manual
GMC-I Messtechnik GmbH 11
8 Resistance and Diode Measurements
8.1 Resistance Measurement (2-wire connection) []
➭ Make sure that the device under test is voltage-free (see
chapter 7.1). Interference voltages distort measurement
results and damage the instrument!
➭ Set the rotary selector switch to “”.
➭ Connect the device under test as shown.
Note!
High Impedance Measurements in the 3 M/ 30 M
Range
In the event of extremely high resistances the
capacitive influence of the person performing the
measurement and/or the measuring cable may
distort the measured value.
Use therefore short or shielded measurement cables.
8.1.1 Zero Balancing in the 300 and 3 k Measuring Ranges
Cable and contact resistances can be eliminated for the
measurement of small resistance values in the 300 and
3k ranges by means of zero balancing:
➭ Plug the measuring cables into the instrument and
connect the free ends to each other.
➭ Press the FUNC key.
The instrument acknowledges zero balancing with an
acoustic signal, and „000.00 “ or „0.0000 k“ and the “ZERO”
symbol appear at the display. The resistance value measured
at the moment the key is pressed serves as a reference value
(max. 20 , or 200 , or 2000 digits). It is automatically
subtracted from all subsequent measured values. If the
measuring range is changed (MAN|AUTO key), the ZERO
function remains active (at the display and in memory).
➭ Zero balancing can be deleted:
– By once again pressing and holding the FUNC key, which
is acknowledged with two acoustic signals,
– By switching the instrument off.
0.L
k
FUNC
0.5435
diode
V
FUNC
000. .0
short
FUNC
m
S+S–
VC
R
x
Voltage Drop
: 10 m 30 M
Overall measuring range:
+–