Preliminary Checks; Battery Replacement - Megger BM15 Guia Del Usuario

PRELIMINARY CHECKS

Preliminary Performance Checks
The instrument will operate in any position, but best results are achieved
when the instrument is face up, on a firm level surface. This is particularly
true for hand cranked units to obtain a crank speed of >180 rev/min.
1) If battery cells are fitted, switch to Battery Check range and press
the 'Test' push button. Confirm that the pointer settles within the
battery symbol portion of the scale.
2) With the test leads disconnected, set the rotary selector switch to the
appropriate insulation range, press and hold down the 'Test' button,
(or turn the generator handle). The meter pointer should move up the
scale briefly and then return to the '∞' (infinity) position on the scale.
This establishes that there is no leakage through the instrument itself.
3) Check that the test leads and crocodile clips are in good order, clean
and with no broken or cracked insulation. Connect two of the test
leads to the '+' and '-' terminals and ensure that their clips are not
touching anything.
Press the 'Test' button again (or turn the generator handle) and
4)
observe the meter pointer. The pointer should rest over the '∞'
position on the scale. If it does not, the test leads may be faulty and
should be inspected more closely for damage. Replace them if
necessary.
5) Connect the test lead clips together, press the 'Test' button (or turn the
generator handle) and observe the meter pointer. The meter should
read '0Ω'. If it indicates infinity or a high resistance value the leads
may be open circuit and should be inspected further. Replace them if
necessary. (Shorting the leads together and obtaining a '0 Ω' reading
also indicates that the instrument is working).

Battery Replacement

G
The battery contacts are not isolated from the test leads. Remove the test
leads from the instrument before opening the battery compartment.
The cells are housed in a battery compartment in the base of the
instrument. To change the cells, use a screwdriver to remove the battery
cover securing screws and lift off the battery compartment cover. Observing
the correct polarity as marked on the battery housing, install 8 replacement
IEC LR6 (AA) cells. Replace and secure the battery compartment cover on
completion.
WARNING
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