Megger BM80/2 Series, User Manual

Page: 7 / 89

Operation
Testing is automatically inhibited if......
• An external voltage >55 V is present when
switched to any Insulation position above
50 V.
• An external voltage >25 V is present on all
other ranges (excluding Voltmeter
position).
The external voltage is indicated on the display
and the bleeper sounds intermittently.
Voltage Testing on High Energy Systems
Use extreme care when using or measuring
voltages above 30 V, particularly in high
energy systems. Fused test leads are available
as optional accessories. These are strongly
recommended for use when making voltage
tests. (GS38 H.S.E document).
Auto-shut Off
To conserve battery life, Auto-shut Off
(preceded by a series of bleeps) operates after
12 minutes of instrument inactivity in all
insulation test switch positions, and after 5
minutes of instrument inactivity in all other
switch positions. If desired, the 5 minute shut-
off can be changed to 60 minutes (non
insulation test switch positions). To do this, first
perform a battery check, then press the TEST
button twice to show (
➔ 60).
If an insulation test, or OFF is subsequently
selected, the shut-off time reverts to the default
times. It is therefore not possible to generate
dangerous voltages for more than 12 minutes,
even with a locking test button.
To restore operation after Auto-shut Off, select
OFF followed by the required switch position.
Note: Auto-shut Off has a small power
consumption and it is recommended that the
instrument is switched to OFF when not in use.
This is particularly important at the end of the
working day, since no battery power is used in
the OFF position.
6
The circuit under test must be completely de-energized
and isolated before test connections are made.