User Manual
GMC-I Messtechnik GmbH 39
Measurements: V/Hz, , , Temp (°C/°F), , M
@UISO
, A/Hz
5.7 Insulation Resistance Measurement – M
@UISO
Function
5.7.1 Preparing for Measurement
Note
Testing the Measurement Cables
The test probes at the ends of the measurement cables
should be short circuited before performing insulation
resistance measurements with the selector switch in the
or the position, in order to make sure that a value close
to 0 is displayed at the instrument. Incorrect connection
or a broken measurement cable can be detected in this way.
Note
Insulation resistance may only be measured at voltage-free
devices. The measurement cables may not come into con-
tact with one another during high-resistance insulation
measurements.
➭ Set the rotary switch to “
M
@UISO
”.
➭ Connect the measurement cables to the two accessible jacks.
➭ Interference voltage measurement (V AC+DC TRMS) is
conducted in this switch position.
The FUNC | ENTER key for U
ISO ON / OFF may only be pressed in
order to start the insulation resistance measurement if the
device under test is voltage-free.
Note
The M
@UISO
switch position may only be used for
insulation resistance measurement. However, if interference
voltage is inadvertently applied with the switch in this
position, it appears at the display.
If an interference voltage of 50 V is present, insulation
resistance measurement is disabled. The LCD continues to
display the interference voltage value. If a voltage of greater
than 1000 V is present, an acoustic signal is generated as
well.
COM mA A
V
Temp
MISO
00
.
00
Short circuit the measurement cables.
R
x
0V !
!
M
@UISO
V
Interference Voltage Detection
000
.
0
V
DC
AC
TRMS
1M
ISO 500 V