The Megger® BM220 series of analog Arc/Digital
Insulation and Continuity Testers comprises a range of
instruments which offers comprehensive test features in a
cost effective package.
Combining an analog arc with a clear 3 digit LCD, the
instruments offer a choice of insulation test voltages, with
the option of single, dual or triple test voltage instruments.
A selectable backlit display is incorporated to ensure
readings may be taken in low light areas such as
distribution boards or enclosures.
All instruments detect inadvertent connection to a live
system which is energised to greater than 25 V. Dependent
on model, the instruments either switch to the default
voltmeter or indicate the presence of voltage by beeping
and flashing the display.
Under this condition an insulation or continuity test cannot
be carried out and the instrument will therefore
automatically inhibit any further action until the source of
voltage has been removed. Although insulation tests
should only be carried out on de-energised systems, the
instruments are protected on all ranges against accidental
connection to phase to earth voltages up to 300 V a.c. and
phase to phase voltages of 400 V a.c., Installation Category
Further indicators illuminate to show a low battery state
and if the protective fuse has ruptured. To avoid accidental
use of the 1000 V range, an indicator flashes for 3 seconds
when the range is selected giving a visual warning.
The instruments will automatically shut down after 5
minutes of non use to conserve battery life.