COMBI521
EN - 23
6.3. RPE: CONTINUITY OF PROTECTIVE CONDUCTORS
This function is performed in compliance with standards IEC/EN61557-4, BS7671
17th/18th edition and allows measuring the resistance of protective and equipotential
conductors.
CAUTION
The instrument can be used for measurements on installations with
overvoltage category CAT IV 300V to earth and max 415V between
inputs.
We recommend holding the alligator clip respecting the safety area
created by the hand protection (see § 4.2).
Check that no voltage is present at the ends of the item to be tested
before carrying out a continuity test.
The results may be influenced by the presence of auxiliary circuits
connected in parallel with the item to be tested or by transient currents.
The following operating modes are available:
STD
The test is activated by pressing the
GO/STOP
key (or
START
on the remote
switch probe
). Recommended mode
TMR
The user can set a sufficiently long time to be able to move the tip on the
conductors being examined while the instrument performs the test. For the
whole duration of measurement, the instrument emits a short acoustic signal
every 3 seconds.
The user shall touch the metal part under test while the
instrument beeps.
If, during measurement, a result takes a value higher than
the set limit, the instrument emits a continuous acoustic signal. To stop the test,
press the
GO/STOP
key or the
START
key on the remote switch probe again.
>
<
Compensation of the resistance of the cables used for measurement. The
instrument automatically subtracts the value of cable resistance from the
measured resistance value.
Therefore, it is necessary that this value is
measured (by the >
< function) each time the measuring cables are
changed or extended.
CAUTION
Continuity test is carried out by supplying a current higher than 200mA
in case the resistance does not exceed ca. 5
(including resistance of
the test cables). For higher resistance values, the instrument carries out
the test with a current lower than 200mA.
Fig. 8: Continuity test by means of single cables
