LEM SATURN 100 plus Instrucciones De Uso página 25

Measuring
Read measured value, contact voltage „U
Display" brings up the loop resistance „R
connection resistance „R ", the tripping time „t
A
tripping) the tripping current „I A " (for measurement with increasing test current) and
then again „U " into the display.
L
k
For another measurement press key
To return to the original mode RCD-Measurement for displaying the mains voltage
„U L-PE ", turn the central selector.
Note:
For very accurate measurements of low loop or earth/ground-connection
resistances (below 1 Ohm), measuring-lead zero compensation may be performed
as per section 3.10.
Error Messages:
Flashing symbols on the display generally signify illegal conditions or errors, for
further information see section 3.11 „Display hints".
CAUTION! To be certain that the fault current-protection circuit is operative, the
measurement must be effected at the first measuring point (outlet, device...) of
each FI current circuit with tripping of the FI-Circuit breaker! Testing without tripping
is only permitted for all measuring points connected in parallel.
When testing three-phase fault-current-protection circuits, each phase (L
must be checked with respect to protective wire to ensure that all phases are
properly connected to the FI circuit breaker.
Fluctuations of measured value:
If, in case of several measurements, large differences occur between the measured
values, the reason is a mains voltage subject to major fluctuations.
The remedy is a measurement with probe, as described below.
Measurement with probe:
For measurements with probe, connect as per Figure; additionally put the included
leas
q
(25 m) into the sonde jack PROBE „Sonde". The text „Sonde" appears on the
display. Connect the free end of the probe measuring lead to earth/ground by using
the included earth/ground rod.
When measuring with probe take care that the probe is placed outside any voltage
funnels; i.e., keep a distance of approx. 20 m from the effective earth/ground
connections (see Connecting Diagram). To check, perform a measurement,
remembering the measured value; reposition probe and repeat measurement. If the
measured value remains unchanged, the distance of the probe from the
l
". Repeated pressing of key
L
" or, if a probe is used, the earth/ground-
S
" (not for measurement without
A
„Start".
L L
1. 2
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)
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