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.





Share this article:
Share via emailShare via LinkedInPrint this page

Further reading:

Connectors for the evolving world of test and measurement
Spectrum Concepts Test & Measurement
Instrumentation employed to test new products needs to become more advanced to keep up with rapidly advancing technology.

Read more...
Tektronix reimagines performance and portability in oscilloscopes
RS Components (SA) Test & Measurement
The new 2 series of oscilloscope can move from the bench to the field and back, enabling workflows previously not possible.

Read more...
All-in-one documenting process calibrators
Comtest Test & Measurement
The multifunction calibrators perform sourcing, simulation and measurement of pressure, temperature and electrical signals.

Read more...
Avoiding safety hazards during solar PV installations
Comtest Test & Measurement
Safety levels during solar panel commissioning and installation have been strengthened by Fluke’s CAT III 1500 V true-RMS clamp meter.

Read more...
World’s fastest 16-bit arbitrary waveform generator
Vepac Electronics Test & Measurement
The ARB Rider AWG-5000 has a 6,16 GS/s real-time update rate with a 16-bit vertical resolution and is available in two, four or eight channel models.

Read more...
Modbus probes gain support for parity options
RF Design Test & Measurement
The marquee feature of firmware version 1.06 facilitates the use of odd, even, mark or space parity modes when communicating with bus probes.

Read more...
Embrace the full power of J-Link debug probes
CST Electronics Test & Measurement
J-Link is supported by all major IDEs, from free Eclipse-based ones up to commercial-grade ones like Segger Embedded Studio.

Read more...
40 GHz RF power sensor
Conical Technologies Test & Measurement
Mini-Circuits’ PWR-40PW-RC is a USB/Ethernet-controlled power sensor capable of making many different measurements.

Read more...
Power device analyser
Concilium Technologies Test & Measurement Power Electronics / Power Management
Keysight’s new PD1550A is an advanced double-pulse tester that enables customers to test entire power modules quickly and easily.

Read more...
Evaluation board for MEMS devices
Altron Arrow Test & Measurement
The STEVAL-MKI220V1 is an adaptor board designed to facilitate the evaluation of MEMS devices in the LPS27HHTW product family.

Read more...