Premium Insulation Multimeters
with Result Storage
The new Megger BMM2500 series of
Insulation Multimeters utilise advanced
microprocessor technology to provide a
host of new features not normally
associated with standard insulation and
continuity testers.
The instruments utilise a large backlit
LCD display incorporating a patented
analogue arc which incorporates the
benefits of electronic analogue
indication and unambiguous digital
readings. The analogue scale provides
rapid identification of insulation
condition highlighting any variable
readings and is complemented by the
precision and simplicity of the digital
The BMM2500 series provide the ideal
mix of features for the busy electrical
contractor requiring the ultimate in
performance and functionality
combined with speed of operation and
efficiency provided by the downloading
of data. When combined with software
certification the system provides a
highly professional image for the
contractor combined with the ever
Fully Complies with the
requirements of BS 7671,HD384, IEC
364and EN61557
Insulation measurement up to 200G
Live Circuit Warning
200mA Continuity Range
Voltage, current and k resistance
mV Transducer inputs
Result storage and Data Logging
PowerSuite™Compatible RS232 output
Download Manager Software included
Direct Printer Output
Remote control switched probe
Waterproof and Dustproof to IP54
increasing need for tracability of test
The BMM2580 offers all the features of
the 2500 but with the addition of 100V
and 50V insulation ranges and a 10uF
capacitance range. These additional
features make the instrument ideally
suited for applications in the telecom
Both instruments offer comprehensive
data storage options with individual test
results being stored against user
selectable distribution board and circuit
references. Alternatively data logging
may be selected and up to 300
consecutive measurements of any
chosen parameter may be made at a
selectable time interval. Data storage is
contained within non-volatile memory,
(NVM), ensuring that test results are
not lost in the event of battery failure or
Once stored, results may be recalled to
the display, printed to an external serial
printer or downloaded to suitable
AVO Download Manager™ for
Windows is included enabling
language changes to be performed,
along with the simple download of
stored data from the instrument into
comma separated variable files. These
files can be maintained as a record,
used for manually completing
certificates or exported to other
applications such as spreadsheets and
word processor documents. Where
creation of certificates of test is
required both instruments are fully
compatible with AVO PowerSuite for
Windows and AVO NICEone. (for
N.I.C.E.I.C. Certification alone)
Both instruments feature special mV
ranges enabling connection of a wide
variety of mV output transducers.
Such devices extend the range of
possible measurements almost
endlessly including such items as
temperature probes, airspeed
indicators and high current
clampmeters thus extending the scope
of the BMM2500 series into key
industries such as Heating and
ventilation (HVAC), and Servicing.
Electrical Contractors
The BMM2500 series insulation multimeters has a wide variety of applications and is ideal for testing electrical installations to both
the British and the International Wiring Regulations. Each instrument conforms to the requirements of Table 71A in BS7671 and to
VDE 0413 parts 1 and 4, HD 384, IEC 364 and EN 61557. In addition the range meets the requirements of BSEN 61010-1 for safe
connection to a 440V Installation Category III supply.
The BMM2500 series Insulation Multimeters are designed to provide the electrical contractor with the ultimate tool for
testing/commissioning fixed installations. The on-board storage facilities enable each test result to be assigned to particular
distribution board and circuit references. Data may be later recalled to the display for manual completion of certificates of test or for
maximum performance downloaded to certification software such as AVO PowerSuite for Windows or NICEone to create a seamless
recording system with the tracability necessary for safety critical applications. The inclusion of an intelligent backlight ensures that
the display can be clearly seen even where the distribution board is located in a dark cupboard but without ruining battery life.
Three insulation test voltages of 250,500 and 1000V are provided to ensure that the correct test voltage for the installation under test
is always available. The 500 V range is suitable for the majority of testing on circuits with a nominal voltage up to 500V. The 250V
insulation range is necessary where low voltage circuits supplied by an isolating transformer are tested whilst the 1000V range is
used for circuits with a nominal voltage exceeding 500V and below 1000V. An additional leakage facility allows any insulation
measurement to be displayed in terms of microampere leakage currents.
The instruments have a 200mA continuity range which is ideal for testing the continuity of ring final circuit conductors, primary
bonding of services and of supplementary bonding conductors. The zero offset adjustment allows the resistance of the test leads to
be ignored so the measurement shown is due to the conductors under test only.
The feature set of the BMM2500 series extends to include measurement ranges for voltage, current, resistance enabling one
instrument to be used where normally a separate multimeter would be called for.
To aid operation in awkward situations where the instrument cannot be held in one hand the MEGGER SP1 switched probe,
(supplied as standard), may be connected enabling control of the instrument test button directly from the probe.
In addition to the electrical features above the rugged design of the BMM2500 range ensures that they can withstand the everyday
handling, transportation and storage with other tools in the contractors toolbag and the BMM2500 is supplied with a three year
manufacturer’s warranty.
Servicing and HVAC
The BMM2500 series are ideal tools for the service industry since they offer a comprehensive range of features
addressing the requirements of the service engineer in a single unit.
The insulation ranges are useful for establishing the integrity of the internal parts such as motors, timers and
transformers whilst the continuity range can verify the correct earth bonding of the case metalwork and checking the
operation of switches etc.
The multimeter functions of Voltage, Current and Resistance find a multitude of uses in the measurement of component
parts within consumer appliances such as the verification of correct mains supplies timer switching characteristics and
component level measurements on control PCB’s.
The unique mV transducer input ranges enable the BMM2500 series to interface to a vast range of transducers for
measurement of the various parameters necessary during servicing and in the commissioning and verification of HVAC
systems. Temperature measurement is one of the most important additions for the service industry enabling the correct
operation of items such as oven thermostats or the measurement of heated air temperature and humidity to be made.
To further assist in servicing situations higher currents, (up to 10A ac), may be measured by connecting the optional
MEGGER MCC10 current clamp. This enables measurements of appliance element/motor currents etc to be made
quickly and safety without interrupting the conductors.
Data Logging Applications
The advanced data logging facilities of the BMM2500 series enable a log of measured value at regular presettable
intervals for any of the measured parameters e.g. , voltage, capacitance, insulation, resistance. etc In the case of
insulation resistance the logging facility enables calculations of Dielectric Absorption Ratios and polarisation Index.
The polarisation index is defined as the ratio between the insulation resistance values after 1 minute and 10 minutes.
This calculation is often useful for determining insulation quality without the need for temperature compensation or
necessary referral to historic test data.
(All quoted accuracy’s are at +20
Insulation Ranges
Test Voltages: 250, 500, 1000V
Test Voltages: 50, 100, 250, 500,
1000V (BMM2580)
Measuring Range:
BMM 2500 0,01 MΩ to 20GΩ
BMM 2580 0,01 MΩ to 200GΩ
(0 - 100 GΩ on analogue scale ).
EN61157 Operating range
0,10Ω to 99,9MΩ
Test voltage accuracy:
+15% maximum on open circuit
Short circuit current:
< 2 mA
Test Current on load:
1mA at min.
pass value of insulation specified
in BS7671,HD384 and IEC 364, 2mA
± 2% ± 2 digits
Auto-Discharge facility safely
discharges the connected circuit
after a test
Live Circuit Warning
Provides automatic warning when
connected to live circuits. Threshold
Operates continuously at
less than ≈5 Ω
Measuring Range:
0,01 kΩ to 9,99MΩ
(0 to 100 MΩ on analogue scale)
with Auto Ranging or Range
0,1mA to 10mA d.c. or a.c.
(50/60 Hz) ± 2% ±5 digits
10mA to 500mA a.c.
(16-460 Hz) ± 5% ±3 digit
Lock Facility.
± 3% ± 2 digits
Open circuit voltage:
5 V ±1 V
Measuring range: 16Hz to 460Hz
±1% ± 1digit
Measuring Range:
±1V to ±500V(0 to 1000V
on analogue scale)
User selectable LED backlight with
auto turn off to save battery life
0 to 500 V d.c. or a.c.
(50/60 Hz) ± 2% ±3 digit
0 to 500 V 400 Hz a.c.
± 5% ±3
Measuring Range:
±0,1mV to 1999mV
(0 to 1000mV on analogue scale)
10mV to 1999mV d.c. or a.c.
(50/60 Hz) ± 2% ±3 digit
0,1mV to 10mV a.c.(16-460 Hz)
5% ±7 digits
± 2% ± 2 digits
Open circuit voltage:
5 V ± 1V
Test current:
210 mA ± 10 mA (0 - 2 Ω)
Zero offset at probe tips:
0,10 Ω typical
Lead resistance zeroing:
Up to 9,99 Ω
Test Result Storage
Up to 99 Distribution Board
References each with up to 99
Circuit References may be
specified. Test Results may be
stored against any circuit and
distribution board combination.
Data may be recalled to the display,
printed or downloaded to AVO
PowerSuite for Windows or AVO
NICEone software
RS232 9 pin male D connector
Baud rate 9600
Printer Output
Prints test results, distribution
board and circuit details to
external serial printer.
10mV to 1999mV a.c. (16-460 Hz)
± 5% ±3 digit
EN61577 Operating Range
0,10Ω to 99,9Ω
0,1mA to 10mA a.c.
(16-460 Hz) ± 5% ±7 digits
Short circuit current:
25 µA ± 5 µA
0,1mV to 10mV d.c. or a.c.(50/60
Hz) ± 2% ±5 digits
Measuring Range:
0,01 Ω to 99,9 Ω
(0 to 10 Ω on analogue scale)
10mA to 500mA d.c. or a.c. (50/60
Hz) ± 2% ±3 digit
d.c. millivolts zeroing
Up to 9,9mV
Two selectable language options
Language 2 may be changed using
AVO Download Manager Software
supplied as standard.
Transducer Compatibility
Virtually any mV output transducer
may be connected to facilitate
measurements of other parameters
such as temperature, humidity etc.
A unique transducer offset
adjustment facility is included.
Data Logging
The instruments may be set to
continuously record any one of the
measurable parameters e.g.
voltage, insulation resistance etc.
The Logging interval may also be
adjusted to suit the application.
Capacitance (BMM2580)
Measuring Range:
0,1nF to 9,99µF
±3% ± 2 digits ± 0,2nF
uF zeroing:
Up to 10nF
Logging Interval
10s to 1990s in 10s increments
Measuring Range:
0,1mA to 500mA (0 to 1000mA on
analogue scale)
Number of samples
Approximately 300
As above for each parameter
Power Supply
Battery Type:
6x1,5V Alkaline cells IEC LR6 type
1000 V a.c. and 1500 V d.c. Equipment for testing, measuring or
monitoring of protective measures:-
Battery Life:
Typically 2100 , 5 second 1kV tests
Part 1 - General requirements
Part 2 - Insulation resistance
Part 4 - Resistance of earth
connection and equi-potential
Part 10 – Combined Measuring
Auto Shut Off
The BMM 2500 series feature an
auto shut off facility which turns the
instrument off after approximately 5
minutes, (12 minutes on insulation
ranges), to conserve battery life
The BMM2500 series complies with
the latest international directives
concerning safety and
electromagnetic compatibility
The instruments meet the
requirements for double insulation
to IEC 61010-1 (1995), EN 61010-1
(1995) Safety Requirements for
electrical equipment for
measurement, control, and
laboratory use. Category III**, 300
Volts phase to earth (ground) and
440 Volts phase to phase, without
the need for separately fused test
leads. If required, fused test leads
are available as an optional
FUSE 500mA (F) 500V , 32x
6mm Ceramic HBC 10kA minimum.
Length 220mm (8.66 inches)
Depth: 110mm (4.33 inches)
Height: 45mm (1.77 inches)
742g (1.63lbs)
(including batteries)
Cleaning Wipe with a clean cloth
damped with soapy water or
Isopropyl Alcohol(IPA)
Electromagnetic Compatibility
RF Susceptibility
The BMM 2500 series comply with
IEC 61326
RF Emission
The BMM 2500 series comply with
IEC 61326
Environmental Conditions
Operating range -5 to +40 °C
Operating humidity 90% RH at 40
°C max.
Storage temperature range -25 to +65
Calibration Temperature +20 °C
** Relates to the transient overvoltages likely to be met in fixed
wiring installations.
Maximum altitude 2000 m
Complies with the following parts of
EN 61557, Electrical safety in low
voltage systems up to
Dust and water protection IP54
Temperature coefficient <0,1% per
Order Code.
250/500V/1000V Insulation Multimeter …… BMM2500
50/100/250/500/1000V Insulation Multimeter BMM2580
Included Accessories
User Guide
Physical Specifications
Part Number
Depends on language
Test lead set
Test-&-carry case
Switched probe SP1
AVO Download Manager Software on CD
Optional: Accessories
Fused lead set, FPK8
Test Record Cards (Pack of 20)
MCC10 10A Current Clamp
Service Manual BMM’s
Computer Serial Lead
Printer Serial Lead
Part Number
Optional Software
AVO PowerSuite for Windows
See supplier
(Comprehensive Electrical Testing Software)
(Certification software for producing NICEIC certificates)
‘A Stitch in Time’ (Video)
Electrical Guide
Testing Electrical Installations (Book)
The Company reserves the right to change the specification or design without prior notice. AVO and MEGGER are the Registered Trade