Test & Measurement

Insulation tester - 'Megger'

27 February 2002 Test & Measurement

Spescom MeasureGraph has introduced the new Megger BMM500 series of insulation/continuity testers. These instruments provide all the necessary features for electrical installation testing and servicing needs. 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.

All instruments are microprocessor-controlled and combine superior performance with ease of use. For ultimate reliability the BMM500 series is waterproof and dustproof to IP54 and is supplied with a 3-year warranty.

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 do not 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 instrument's 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 buzzer

The buzzer 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 one second to respond, making them highly tedious and frustrating in use. The Megger BMM500 series has specially designed 'instant response' circuitry some 80 times faster than usual. This '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 kOhm in which case no sound will be emitted. This provides a useful audible approximation of the value being measured.

DART 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 a momentary insulation breakdown or poor continuity connection), with the stability and simplicity of a digital reading. The backlit display enables 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 1 mA test current at the minimum pass levels expressed by 16th Edition Wiring Regulations, (BS7671), IEC364, HD384 and VDE0413 Parts 1 and 4.

The BMM500 series is ideally suited to the service industry since they offer a comprehensive range of features in a single unit.

For further information contact Kevin Preston, Spescom MeasureGraph, 011 266 1500.

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