• Megger

Megger® BM80/2 & BM81/2 Series

Multi-Voltage Insulation & Continuity Testers

Megger BM80/2 insulation & continuity testers


  • Analog and Digital display of data
  • Fully complies with the requirements of BS 7671, HD 384 and IEC 364
  • Multiple insulation test voltages from 50 V to 1000 V d.c. (according to model)
  • Remote control switched probe option
  • Optional RS232 port
  • Optional current clamp accessory
  • Waterproof and dustproof to IP54


The MEGGER BM80/2 Series are multivoltage insulation and continuity testers offering advanced performance, specification and features, and simplicity of use. They have insulation test voltages from 50 V to 1000 V d.c., (500 V max. on BM81/2.) The comprehensive specification is achieved using the latest electronic design and technology.

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Extensive use by electrical contractors.

These insulation testers are designed for flexibility and versatility, they have a wide variety of applications, ideal for testing electrical installations to the British and International Wiring Regulations. Each instrument in the series conforms to the requirements of Table 71 A in BS 7671, and to VDE 0413 parts 1 and 4, HD384 and IEC364.

The BM80/2 series can be used in both the domestic and industrial contracting environments. Test voltages of 250 V, 500 V and 1000 VDC are available. A 250 V insulation test voltage is necessary to test low voltage circuits supplied by an isolating transformer. 500 VDC is the most commonly required voltage, since it is used to test all circuits except low voltage circuits with a nominal voltage up to and including 500 V. The 1000 VDC test voltage is used on circuits with a nominal voltage greater than 500 V and less than 1000 VDC ring final circuit conductors, and the polarity of the conductors.

The BM80/2 can also be used for insulation and continuity tests on transformers, motors, generators, domestic appliances, power tools, such as electric drills, and many other pieces of electrical equipment. On high energy systems it is recommended that test leads with fused prods are used when measuring voltage.

  • Literature
  • Specifications
Insulation Ranges
Test Voltages : 50 V, 100 V, 250 V, 500 V and 1000 V(1000 V not available on BM81/2.)
Measuring Range:
1000 V range: 0–200 GΩ
500 V range: 0–100 GΩ
250 V range: 0–50 GΩ
100V range: 0–20 GΩ
50 V 0–10 GΩ
Test voltage accuracy: +15% maximum on open circuit
Test Current on load:

1 mA minimum at the minimum pass
values of insulation specified in BS
7671 (formerly the 16th Edition IEE
Wiring Regulations)on the 250V, 500 V
and 1000 V ranges.

50 V range: 0,2 mA at 250 kΩ

100 V range: 0,4 mA at 250 kΩ

1000 V ±2% ±2 digits ±0.4% per GΩ
500 V ±2% ±2 digits ±0.4% per GΩ
250 V ±2% ±2 digits ±0.8% per GΩ
100V ±2% ±2 digits ±2% per GΩ
50 V ±2% ±2 digits ±4% per GΩ
Measuring Range: 0,01 Ω to 99,9 Ω (0-50 Ω on analog scale)
±2% ±2 digits
Open circuit voltage: 5 V ±1V
Test current: 205 mA, ± 5 mA
Continuity Buzzer Operates at less than 5 Ω approx.
Measuring Range: 0,1 – 100 kΩ(0 – 10 MΩ on analog scale)
Accuracy: ± 3% ± 2 digits
Open circuit voltage: 5 V ±1V
Short circuit current 20 μA, ±5 μA
Measuring Range: 0 to 600 V AC/DC, 0 to 50 V AC/DC,
Accuracy: <450 V a.c. (50/60 Hz) and d.c.±1%, ±2 digits

>450 V a.c. (50/60 Hz) and d.c.

±2%, ±2 digits

<450 V a.c. 400 Hz: ±5%, ±2 digits

1,0-50,0 V Range a.c./d.c.

±2%, ±3 digits

Default Voltmeter
The default voltmeter operates when
an external voltage >25 V a.c. or d.c. is
detected on any range except OFF and
. If this voltage exceeds 55 V then
insulation testing will be inhibited.
Reverse polarity d.c. will cause ‘-d.c.’ to appear on the DISPLAY.
Auto Shut off
The instrument auto shut off operates
5 minutes after the start of a test, on
all ranges, except the insulation
ranges where it operates after
12 minutes. This can be adjusted to
60 minutes for the voltage, continuity
and KΩ ranges. Selecting an
insulation range or off
Battery Type:: 6 x 1,5 V Alkaline cells IEC LR6 type
Battery Life: Typically 3000, 5 second 1 kV tests
The instruments meet the requirements
for double insulation to IEC
1010-1 (1995), EN61010-1 (1995) to
Category III, 300 V phase to earth
(ground) and 440 V phase to phase.
Over voltage measuring facilities exist
to indicate capacitive discharges.