megger MTR105

New Megger tester offers all-in-one testing for motors

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Megger’s new MTR105 Static Motor Tester combines a comprehensive range of insulation tests with all the great traditional features and reliability of its testers.

The MTR105 takes the test abilities of Megger’s proven IR test instruments adding DLRO four-wire Kelvin low resistance test, inductance and capacitance tests to provide a versatile motor tester, all packaged in a robust handheld instrument, which up to now has not been available.

Additionally the MTR105 incorporates temperature measurement and compensation (for IR tests), motor direction of rotation plus supply phase rotation tests.

These new test abilities make the MTR105 a real-world, versatile, handheld motor test instrument.

The technical stuff

This diminutive tester, which weighs less than 1 kg, provides facilities for a comprehensive range of insulation tests and for making four-wire low-resistance measurements.

An internal memory with capacity to store 100 test results is provided and results in memory that can either be recalled to the display or downloaded to a standard USB thumb drive.

The MTR105 offers insulation resistance testing at user-selectable voltages from 50 V to 1,000 V.

megger MTR105

Test voltages are stabilised, which ensures reliable results and eliminates the risk of over-voltage damage. In addition to standard insulation tests, the MTR105 supports PI, DAR and timed tests, which can provide valuable extra information about insulation condition.

For low resistance testing, the MTR105 offers a single continuous range from 0.01 Ω to 1.0 MΩ for continuity measurement.

It supports four-wire testing up to 10 Ω and has a bi-directional test option that automatically reverses the current without the need to reconnect the test leads.

Users can select a test current of 20 mA or 200 mA. A continuity buzzer function, with an adjustable threshold, is also provided.

The MTR105 includes live circuit detection and test inhibit features for insulation testing and continuity measurements, and default display of live circuit voltage on all ranges.

The detection and inhibit functions continue to operate even if the instrument’s internal protection fuse has failed.

A shock-absorbing rubber over-moulding provides further protection as well as making the instrument easy to grip.

As standard, the MTR105 is supplied complete with leads and a variety of clamps and probes for insulation testing, and with a Kelvin-clip lead set for use when making four-wire low-resistance measurements.


For more technical info, head to Megger’s website.

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