11
The following descriptions of tests are a set of instructions for the sole
purpose of the proper use of these instruments by competent persons.
Where there is doubt about a particular application, reference should be
made to the advice and guidance contained within the publication ‘Down to
Earth’, available from Megger.
DESCRIPTION OF TESTS FOR MODELS DET3TC, DET3TD DET4TD
Battery
Before proceeding with measurements, ensure that the charge condition of
the batteries is sufficient to undertake the intended measurements. The
charge status is given in the bar-graph, as shown in Figure 1, which is
continually shown on the LCD when the instrument is switched on.
Measurement of ground noise voltage (DET3TC, DET3TD and
DET4TD)
Figure 2: Connections for measuring ground noise voltage and two-terminal
resistance.
Blown fuse symbol:
f
(DET3TD, DET3TC and DET4TD)
Only one fuse is contained within the instrument, and is user-replaceable.
When the fuse ruptures, symbol will show and testing is inhibited.
To replace the fuse
Warning: Do not operate instrument with the battery cover removed.
1. To avoid the possibility of electric shock, switch instrument ‘OFF’ and
disconnect the instrument from any electrical circuits.
2. The rear cover must not be opened if the test leads are connected.
3. To avoid the possibility of electric shock, do not press the test button
when replacing the fuse.
4. To remove the rear cover, release the screw at the bottom of the cover
and lift the cover upwards.
5. Disconnect the battery circuit before accessing the fuse.
6. Remove fuse and replace it with of fuse of the same characteristics.
7. Replace the instrument back cover and secure by tightening the
retaining screw.
MEGGER’S ‘DOWN TO EARTH’ PUBLICATION
Earth electrode
(rod) under test
Earth electrode
(rod) under test
Earth electrode
(rod) under test
Test spike
Test spike Test spike
To Next Page
Loading...
