User manual

40 GMC-I Messtechnik GmbH
Measurements: V/Hz, , , Temp (°C/°F), , M
@UISO
, A/Hz
Caution: High-Voltage!
Do not touch the conductive ends of the test probes when the
instrument has been activated for the measurement of insulation
resistance.
You may otherwise be exposed to a current of
2.5 mA (limited in the measuring instrument), and although
this is not life endangering, the resulting electrical shock is
quite discernible. If, on the other hand, measurement is
being performed on a capacitive device under test, for
example a cable, it may be charged with up to approxi-
mately 1200 V. Touching the device under test after measure-
ment has been performed is life endangering in this case!
Selecting the Test Voltage (U
ISO
= 50 to 1000 V*)
The desired test voltage can be selected in the “SET” menu (see
also section 6.4):
1nFo  ...  SET rAtE  ...  v1so
... 500, 1000 V* 
* Selectable test voltages and the default value depend upon the
respective device variant.
Alternatively, the requested test voltage can be selected via the
cursor keys
 . Prerequisite: the multimeter is in switch position
V
1M
and in the AUTO range function.
The selected test voltage appears at the display during testing.
5.7.2 Performing the Insulation Measurement
➭ Starting the insulation resistance measurement:
Press and hold the U
ISO ON / OFF key until the display settles in,
in order to measure insulation resistance.
Insulation resistance measurement is ended by releasing the
key.
Auto-ranging is active during insulation resistance measurement.
For the automatic freezing of valid measured values, a DATA func-
tion specially geared to insulation measurement can be activated,
see section 4.4.1.
MEASURE
SETUP
FUNC
ENTER
FUNC
ENTER
FUNC
ENTER
MAN / AUTO
DATA/MIN/MAX
... 500 V10 V ...
M
@UISO
V
1M 
Autorange
002.00
M 
M
ISO
FUNC
ENTER
UISO ON / OFF
000.0
V
Activate
Test Volta ge
DC
AC
TRMS
500 V
ISO 500 V
M
@UISO
V
1M