General Description - AVO MEGGER BM400/2 Guide De L'utilisateur

The B M 4 0 0 / 2 Series instruments are battery powered Insulation and
Continuity testers, with a measurement capability from 0,01 Ω Continuity
to 999 MΩ Insulation.
Offering multi-voltage facilities, the instruments take full advantage of
microprocessor technology and feature a large liquid crystal display
combining digital and analogue readings. The analogue display has the
benefit of indicating trends and fluctuations in readings, while the digital
readout gives direct accurate results.
A customized connector on the top of the instrument enables the optional
Megger SP1 Switched probe to be used for two handed probe operation.
Available as an optional extra, the Megger DLB Downloading Base can
be fitted for realtime downloading of measured test results to a Personal
computer via an RS232 serial lead. The optional miniature clip-on current
transducer MCC10 enables the instrument to measure a.c. currents from
1 A to 10 A, with a resolution of 0,1 A.
Designed to IEC1010-1 the B M 4 0 0 / 2 Series are protected against
connection to a 440 V Category III supply. The instruments have a basic
accuracy of ± 2% at 20 °C. The instruments are waterproof and dustproof
to IP54. This helps maintain accuracy and ensures maximum reliability in
harsh environments.
Refer to Safety Warnings before using the instrument
Testing is automatically inhibited if:
• An external voltage >55 V is present when switched to any
Insulation position.
• An external voltage >25 V is present on all other ranges
(excluding Voltmeter position).
The external voltage is indicated on the display (flashing 'V' on the
BM402/2 & BM404/2) and the bleeper sounds intermittently.
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 O F F 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 O F F followed by
the required switch position.
N o t e : A u t o - s h u t O f f h a s a s m a l l p o w e r c o n s u m p t i o n a n d i t i s
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.

GENERAL DESCRIPTION

OPERATION