Measuring
17
Observe overload capacity and connect instrument as shown.
When using the 3-pole measuring lead, for a 2-pole measurement the unused
measuring lead L1 must be connected with the Line L3, measurements are only
possible in positions L-PE and L-N.
Turn central selector in function R
iso
to the desired position L-PE, N-PE or L-N. e. g.
L-N: R
iso
is measured between the Points of the 3-pin measuring adapter marked
L and N. The voltage „U
L-PE
“ or „U
L-N
“ is displayed (see also section 3.6).
Press key
R „Start“ and keep depressed until the displayed value no longer
changes. To terminate release the measurement key. The measurement is
automatically interrupted after max. 5 s, in order to spare the batteries.
Read measured value.
Note: After an insulation resistance measurement, the symbol „
“ (approx. for
versions CH/GB
appears with the R
ISO
-value. It defines the wire, which is
considered to be the L line during measurement. This display is exclusively for
the local assignment to switch lettering and makes no statement about the
actual wiring of the installation.
To determine phase connection, proceed as per section 3.4.
By pressing key S „Display“, the applied residual DC voltage can be
displayed after performing the measurement. In the process all
capacitances charged by the measuring DC voltage are simultaneously
discharged. This measurement must be performed after every R
ISO
-
measurement. Wait until the voltage has dropped to < 50 V.
For a new measurement press key R „Start“ again. To return to the original
measurement for displaying the mains voltage U
L-PE
, turn the central selector.
ATTENTION! Under Standards DIN VDE 0100 and ÖVE-EN1, insulation-resistance
measurement is only permitted in voltage-free systems. Therefore before
performing the measurement, the connection is checked for freedom from voltage.
If a voltage of > 50 V is found, no measurement is performed, and the voltage is
displayed. The insulation-resistance measurement between the wires L-PE, N-PE
and L-N is dependent on national regulations. Notice this regulations absolutely.
Error Messages:
Flashing symbols on the display generally signify illegal conditions or errors, for
further information see section 3.11 „Display hints“
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