Battery Replacement; Fuse Checking And Replacement - Megger BMM500 Series User Manual

Operation
button. Up to 9,9mV can be zeroed on the d.c.
mV range. The symbol will appear to
indicate the zero has been adjusted.
1. Select the d.c. mV range.
2. Short the test leads together.
3. When the reading has stabilised, press the
TEST button. The zero offset symbol
will appear.
4. To release the zero offset press the TEST
button again.

Battery Replacement

When the low battery symbol appears, the
cells are nearly exhausted and should be
replaced as soon as possible. Use Alkaline c e l l s
IEC LR6 (AA) or NiCd/NiMH rechargeable. To
install or replace the cells, disconnect the test
leads, switch the instrument to OFF and loosen
the captive screws on the rear of the battery
compartment. Remove the cover
disconnect the battery holder from the battery
leads. Ensure that the replacement cells are
10
fitted with the correct polarity in accordance
with the label in the battery holder. Reconnect
the battery holder to the battery leads. Replace
and re-secure the battery compartment cover.
Remove the cells if the instrument is not going
to be used for an extended period of time.
The BMM500 Series incorporates an electronic
contact detector to minimise the chance of
blowing the fuse even if accidentally applied to
a live circuit whilst switched to the continuity
range. In the unlikely event of the fuse needing
replacement, a spare is located under the
battery cover.

Fuse Checking and Replacement

To check the instrument fuse, switch to an
insulation range and press the TEST button.
The symbol will appear if the fuse is
ruptured. To replace the fuse, disconnect the
test leads, switch the instrument OFF and
and loosen the captive screws holding the battery
compartment cover in place. Remove the cover
and replace the fuse. Replace and re-secure