Megger LT5 Gebrauchsanleitung Seite 15

NOTE:—
Always make the connections this way round.
Reversing the polarity will give the same result,
but means that the instrument circuit is elevated
to 230 V above earth — (this could result in
interference affecting the readings).
6. When the connections have been made the 'P-E'
neon light should illuminate and after a short time
a loop test executed and the measured reading
displayed.
7. If the 'P-E' neon light does not illuminate there is a
disconnection in the earth circuit, bonding or
possibly the phase connection.
No test will be made unless the 'P - E' neon light
illuminates.
8.To repeat a test simply disconnect and then
re-connect one of the prods.
TESTING BONDED METALWORK (conduit) —
Alternative Method Using the Safety Earth Bond
Test Lead — see fig. 4.
Preparing for a Test
1. Locate a convenient 3-pin mains supply socket
outlet, somewhere adjacent to the bonding to be
tested.
2. Connect the safety earth bond lead socket into
the recessed plug in the instrument.
3. Set the slider switch to the appropriate range.
Earth Continuity and Phase-Earth
Impedance Test
4. Connect the test lead 3-pin plug to the convenient
mains supply socket outlet.
Warning: never touch prod tip when the 3-pin
plug is connected to a mains supply.
5.Connect the red prod to the bonded metalwork to
be tested.
Caution: never touch the metalwork etc. when
under test.
6. When the connections have been made the 'P-N'
and 'P-E' neon lights should illuminate and after a
short pause, a loop test will be executed and the
measured reading displayed.
7. If the 'P-E' neon light does not illuminate there is a
disconnection in the earth circuit, bonding or
possibly the phase connection.
Loop
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