Megger BMM501, BMM502 & BMM503

Insulation and Continuity Testers

Megger BMM500  Insulation Tester
  • Options of 250 V, 500 V, 1000 V insulation ranges
  • 200 mA continuity range
  • Instant response “ZAP” buzzer
  • Voltage measurement to 600 V
  • MEGGER Intelligent Safety System
  • Patented backlit display
  • K Ohms range for servicing
  • Probe support for other measurements
  • Waterproof and dustproof to IP54
  • Complies with the requirements of BS 7671 16th Edition, and EN61557
Product Description:

The MEGGER® BMM503 Insulation and Continuity tester provides all the necessary features for electrical installation testing and servicing needs. The instrument is microprocessor controlled to ensure outstanding performance with ease of use. For ultimate reliability, the BMM503 is waterproof and dustproof to IP54 and is supplied with a 3-year warranty.

The BMM500 series has been carefully designed to maximise features which are of real benefit to the electrical contractor or service engineer competing for business in today’s market.

General Description:
  • Intelligent Safety System (ISS): With increased pressure of time to complete jobs it is inevitable that whilst performing tests on an electrical system mistakes will occasionally be made exposing the user to danger or under certain circumstances damaging the instrument. The BMM500 series incorporates Megger’s Intelligent Safety System which has been designed to ensure that such mistakes don’t become disasters.The ISS consists of:
  • Live Circuit Warning: Warns of accidental connection to a live circuit greater than 25 V on any range.
  • Safe Contact Detector: Prevents danger during continuity testing if contact is made with a live circuit and minimises the chances of blowing the instruments fuse.
  • Test Lockout: Prevents test being energised in presence of external voltages.
  • Default Voltmeter: Displays presence of dangerous voltages on connected circuit irrespective of instrument range selected.
  • Auto Discharge: Safely discharges connected circuits after insulation test. Instant Response “ZAP” Buzzer. The audible buzzer range is frequently used for checking for correct polarity in installed circuits and for point to point connectivity in servicing. It is vital that the instrument provides an instant response in such situations. Many insulation testers take up to 1 second to respond making them highly tedious and frustrating in use. The BMM500 series features specially designed “instant response” circuitry some 80 times faster than rival products, making the instrument a pleasure to use. The “Zap” Buzzer also features seven user selectable thresholds below which the buzzer will sound continuously. At values above the chosen limit the buzzer will sound an intermittent tone unless the value is above 3 kΩ in which case no sound will be emitted. This provides a useful audible approximation of the value being measured.
  • D.A.R.T. Display: The BM500 series incorporates a large backlit digital LCD display combining Digital and Analog Response Technology. The patented design provides the benefits of true analog clarity, (with its ability to spot an momentary insulation breakdown or poor continuity connection), with the stability and simplicity of a digital reading. The display is backlit enabling use in dimly lit areas, which is especially useful when the installation power is turned off for testing.
  • Insulation Testing: Instruments are available with either one, two or three insulation test voltages to suit all needs.BM503 = 250 V, 500 V, 1000 V BM502 = 500 V, 1000 V BM501 = 500 V Whichever model is chosen the ranges are capable of supplying 1mA test current at the minimum pass levels expressed by 16th Edition Wiring Regulations, (BS7671), IEC364, HD384 and VDE0413 Parts 1 and 4.
  • Continuity Testing: A hands free 200 mA continuity test range meeting the requirements of UK and European legislation is also included to ensure the accurate measurement of circuit final conductors and primary and supplementary bonding.
  • Test Lead Zeroing: The continuity range has a facility to automatically remove the resistance of the test leads from the measured value, a task that would normally have to be done manually. This ensures that the measurement displayed is due entirely to the conductors under test. The insulation and continuity ranges are augmented by a number of additional measurement ranges such as autoranging voltage measurement up to 600 V ac/dc, and Kilohms resistance measurement enabling component diagnostic measurements during servicing. Current may be measured by connection of an external mV output clamp such as the optional Megger MCC10
  • Pouch: The BMM500 series has been designed to withstand the day to day handling and storage of a tool bag environment and also comes complete with durable carry pouch with provision for storage of all leads.
  • Additional Servicing Measurements: The BMM500 series supports the connection of virtually any mV probe. Such devices extend the range of possible measurements almost endlessly including such items as temperature probes, air speed indicators and high current clampmeters such as used in heating and ventilation (HVAC), and servicing.
Insulation Ranges
Test Voltages : 250, 500, 1000 V
Measuring Range:
1000 V 0,01 MΩ to 10,000 MΩ
500 V 0,01 MΩ to 5,000 MΩ
250 V 0,01 MΩ to 2,000 MΩ
Test voltage accuracy: +15% maximum on open circuit
Test Current on load:
1mA at min. pass value of insulation specified in BS7671, HD384 and IEC 364, 2 mA max.
1000 V ±0,2% per 1000 MΩ, ±2% ±2 digits
500 V ±0,4% per 1000 MΩ, ±2% ±2 digits
250 V ±0,8% per 1000 MΩ, ±2% ±2 digits
Measuring Range: 0,01 Ω to 99,9 Ω (0 to 10 Ω on analog scale)
±2% ±2 digits
Open circuit voltage: 5 V ±1V
Test current: 210 mA ±10 mA (0 – 2 Ω)
“Zap” Buzzer: Operates continuously at less than selected limit or intermittent tone above limit but below 3 kΩ. (Silent above 3 kΩ)
Silent buzzer mode: Replaces audible tone with visual indication on display when measured value below selected limit.
Measuring Range: 0,01 kΩ to 9,99 MΩ (0 to 100 MΩ on analog scale) with Auto Ranging or Range Lock Facility.
Accuracy: ± 3% ± 2 digits
Open circuit voltage: 5 V ±1V
Short circuit current 25 μA ± 5 μA
Measuring Range: ±1V to ±600 V (0 to 1000 V on analog scale)
Accuracy: 0 to 600 V d.c. or a.c. (50/60 Hz) ±2% ±3 digit0 to 600 V a.c. (400 Hz) ±5% ±3 digits
Measuring Range: ±0,1 mV to 1 ±999 mV(0 to 1000 mV on analog scale)
Accuracy: 0,1 mV to 10 mV d.c./ a.c. (50/60 Hz) ±2% ±5 digits10mV to 1999mV d.c./a.c. (50/60Hz) ±2% ±3 digits0,1 mV to 10 mV a.c. (16-460 Hz) ±5% ±7 digits 10 mV to 1999 mV a.c. (16-460 Hz) ±5% ±3 digits
Probe Compatibility
Virtually any mV output probe may be connected to facilitate measurements of other parameters such as temperature, humidity etc. A unique probe offset adjustment facility is included.
Battery Type:: 6 x 1,5 V Alkaline cells IEC LR6 type
Battery Life: Typically 3000, 5 second 1 kV tests
Backlight User selectable LED backlight with auto turn off to save battery life
pdf_pic Downloads: General Specifications
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Auto Shut Off: The BMM500 series feature a selectable auto shut off facility which turns the instrument off after approximately 5 minutes, (12minutes for insulation ranges), to conserve battery life. This can be extended by the user to 60 minutes.
Safety: The BMM500 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 accessory. ** Relates to the transient over-voltages likely to be met in fixed wiring installations. Complies with the following parts of EN6155 Electrical safety in low voltage systems up to 1000 V a.c. and 1500 V d.c. - Equipment for testing, measuring or monitoring of protective
Fuse: 500 mA (F) 500 V, 32 x 6 mm Ceramic HBC 10 kA minimum.
Environmental: Operating range: -5 to +40ºC Operating humidity: 90% RH at 40ºC max.
Storage: Temperature range: -25 to +65ºC Calibration Temperature: +20ºC Temperature coefficient: <0,1% per ºC
Dimensions: Length: 220 mm (8.66 inches) Depth: 110 mm (4.33 inches) Height: 45 mm (1.77 inches) Weight: 742 g (1.63lbs) (including batteries) index web