Instructions
8 GMC-I Messtechnik GmbH
4 Measurements
The test adapter can remain connected to
the system or the mains during the course of
all measurements, assuming absence of
voltage during the insulation resistance mea-
surement.
Note!
The fuses have to be checked before
each measurement. Blown fuses
must be replaced with new ones (see
“Fuse Replacement” on page 15).
4.1 Measuring Insulation Resistance
(R
ISO)
Attention!
!
Single-Phase Mains Connection
The phase must be connected to L1
for single-phase mains connection.
➭ Make sure that the system remains volt-
age-free for the entire duration of the
measurement.
Attention!
!
Insulation resistance can only be
measured at voltage-free systems.
Attention!
!
The N and PE conductors must be
disconnected at all times. Consum-
ing devices should not be con-
nected.
4.1.1 Measuring Insulation Resistance with
the
PROFITEST MTECH+ or MXTRA
Preparing for Measurement
➭ Connect the test instrument’s test plug
to the PRO-SCHUKO plug insert.
➭ Disconnect the system from all sources
of voltage before connecting the mea-
suring points to the test adapter.
➭ Connect the system to sockets L1, L2,
L3, N and PE.
Performing Measurement
Attention!
!
Insulation test voltage may not ex-
ceed 500 V.
➭ Perform the measurement as described
in the operating instructions for the re-
spective test instrument:
PROFITEST MTECH+: sections 5.8 and 11
PROFITEST MXTRA: sections 5.8 and 11
Overview of Connected Conductors
The red illuminated LEDs in the connections
overview indicate the respectively connected
(closed) conductors.
Continuity, MTECH/MXTRA R
ISO
Test
Sequence
R
INS
LED Displays (red)
01/11 N-PE LED4 + LED11
02/11 L1-PE LED1 + LED11
03/11 L2-PE LED2 + LED11
04/11 L3-PE LED3 + LED11
05/11 L+N-PE
LED1 + LED2 +
LED3 + LED4 +
LED11
06/11 L1-N LED1 + LED10
07/11 L2-N LED2 + LED10
08/11 L3-N LED3 + LED10
09/11 L1-L2 LED1 + LED8
10/11 L2-L3 LED2 + LED9
11/11 L1-L3 LED1 + LED9
PROFITESTREMOTE Measurements