GENERAL DESCRIPTION
The Megger BMM80 Series instruments are battery powered
Insulation and Continuity testers, with a measurement
capability from 0,01Ω Continuity to 200GΩ 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. The display is also backlit giving clear visibility
even in low light conditions.
The BMM80 Series instruments have the unique capability of
being able to measure voltages down to a resolution of 0,1mV.
This gives the user the option to fit a wide variety of
transducers to further enhance the capabilities of the BMM
Series instruments, e.g. temperature or humidity measurement.
There is also a facility to measure capacitance on the BMM80,
this can be used in some types of telecommunications
applications for fault analysis.
A customised connector on the top of the instrument enables
the optional Megger SP6F Switched Probe to be used for two-
handed probe operation.
The 250V, 500V and 1000V ranges can be used to test
electrical installations in compliance with BS7671 (16th Edition
IEE Wiring Regulations) IEC364 and HD384, since each range
has a 1mA minimum test current at the minimum pass values
of insulation specified in these documents. The 100V range is
ideal for testing telecommunications equipment which would be
damaged by higher voltages. The 50V range is useful for
testing sensitive equipment, such as electronic components,
and computer peripherals.
Designed to IEC1010-1 the BMM80 Series are protected
against connection to a 500V 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.
OPERATION
Refer to Safety Warnings before using the instrument
Testing is automatically inhibited if:
• An external voltage >25V is present when
switched to any insulation range position.
• An external voltage >10V is present on all
other ranges (excluding OFF/V/mV).
The external voltage is indicated on the display, on insulation
ranges an audible bleeper will sound if a test is attempted.
