The Megger MJ15 is a compact 5 kiloVolt insulation tester that is easy to use & provides accurate and quick readings for insulation resistance.

The BM15 & MJ15 are compact 5 kV insulation testers. They are very simple to use and provide a quick and accurate reading of insulation resistance. The instruments use an analog display with a maximum reading of 20 G.

A voltage range of four test voltages enables measurement of ac or dc conductor potential. The four test voltages available are 500 V, 1 kV, 2.5 kV and 5 kV. The instruments are supplied with a locking or non-locking test button. The locking button allows hands-free testing, the non-locking button is recommended to prevent accidental misuse and injury.

A bezel allows a scale plate overlay to be added with PASS/FAIL bands for GO/NOGO testing. This is particularly useful for less experienced users and enables a rapid decision to be made. The new instruments have a choice of power source, eight x LR6 (AA) alkaline cells or the MJ15 offers an additional hand cranked generator. If the test button is pressed the MJ15 uses battery power. Otherwise the crank handle is turned to save battery power or for use when the batteries are unavailable. Both units are built into a rugged case designed for outdoor use. The instruments are also supplied with a soft carrying case, a test lead set, test record cards and batteries.

Safety terminals suitable for locking connectors are used for connection to the test piece. An automatic discharge circuit eliminates the voltage on capacitive loads after a test. The decaying voltage can also be viewed on the scale. Fused test leads are available as an option for voltage measurement. The instruments meet the IEC1010 safety specification and EMC specifications and are fully CE marked.

Applications

Insulation is important for the safety of all electrical systems, providing barrier to hazardous live conductors. Insulation can deteriorate due to the affects of moisture, sunlight and heat. A reduction in the value of insulation resistance can lead to a potentially dangerous situation caused by the dangers of electric shock, or arcing causing fire. If insulation resistance is regularly monitored unusually low values can be investigated before they cause danger, or inconvenience and cost due to equipment downtime for repairs.

The BM15 & MJ15 are general purpose, 5 kV insulation testers for electrical contractors and engineers who test machinery, transformers, switchgear, cables, etc.