Megger BAKER MTR105


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SKU: 1010-361 Category: Tag:

The MTR105 is a dedicated Static Motor Tester with Meggers tried and trusted suite of insulation resistance tests (IR), plus all the great traditional features and reliability of Meggers 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 hand held instrument, which up to now has simply 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, hand held motor test instrument.

The MTR105 comes in an over-moulded case, providing increased protection and robustness, achieving an IP54 weatherproof rating.

  • Full color graphic display
  • 3 Phase insulation resistance
  • Temperature correction for insulation resistance
  • Guard terminal
  • DLRO four wire Kelvin
  • Continuity and diode test
  • Motor direction of rotation
  • Capacitance and inductance
  • CAT III 600 V up to 3000 m
  • Environmental protection to IP54



  • Production tests for new manufactured motors and generators
  • Test repaired and refurbished motors and generators
  • Monitoring and maintenance of in service motors (off line) in the field


Typical Industries Include

  • Utilities: Electrical power generation, water, oil / gas
  • Industrial: Production line / factory maintenance teams, HVAC field engineers
  • OEM: Motors / generators
  • Service: Motor repair workshops
  • Transport: Rail, electric vehicles, marine, etc



The MTR105 is designed to be exceptionally safe to use. The fast detecting circuitry reduces the likelihood of damage to the instrument if accidentally connected to live circuits or across phases.

  • Meets the international requirements of IEC61010 and IEC61557
  • Live circuit detection and test inhibit on all measurements with user notification (except for direction of rotation measurements)
  • User selectable insulation test terminal lockout voltage 25 V, 30 V, 50 V, 75 V (default is 50 V)
  • Detection and inhibit functions when the protection fuse has failed
  • Suitable for use on CAT III applications and supply voltages to 600 V


Insulation Resistance Tests

  • Resistance range 100 Ω up to 200 GΩ
  • Supports PI, DAR, Timed and Temperature Compensation
  • Stabilized insulation test voltage accurate to -0% 2%
  • ±2 V, which provides a more accurate test voltage without the risk of over-voltage damage to circuits or components. The output voltage is maintained between 0 and 2% throughout the test range
  • Where a nonstandard test voltage is required, a variable range allows the exact test voltage to be selected from 10 V up to 999 V and is subject to the same stabilized output control
  • Dedicated buzzer button either ON, VISUAL or OFF
  • Adjustable buzzer for minimum resistance limit (0.5 MΩ up to 1000 M&#937)
  • Buzzer sounds on test pass



  • Measures ac 10 mV up to 1000 V, dc 0 to 1000 V, TRMS (15 Hz up to 400 Hz)
  • Three phase supply and direction of rotation


Continuity (Resistance) Tests

  • Single automatic resistance range from 0.01 Ω to 1.0 MΩ
  • Automatic test current selection uses the preferred test current for the load resistance under test (200 mA up to 4 Ω)
  • Bi-directional tests option automatically reverses the current without reconnecting leads
  • Lead resistance compensation (NULL) operates up to 10 Ω of resistance
  • Dedicated buzzer switch either ON, VISUAL or OFF
  • Adjustable buzzer for maximum resistance limit (1 Ω to 200 Ω in 12 steps)
  • Buzzer sounds on test pass


DLRO Four Wire Kelvin Low Resistance

  • Automatic resistance range from 1 mΩ up to 10 Ω
  • Selectable auto or manual test
  • Bi-direction or single direction
  • Bi-directional tests option automatically reverses the current without reconnecting leads
  • 200 mA test current


Motor Direction of Test

Tests the direction of rotation of the motor under test and displays the phase sequence on screen.

The connected motor is rotated in one direction and the display shows sequence of the phases of rotation. The motor is next rotated in the opposite direction, the phases are checked again and shown on the display.

Inductance, Capacitance and Resistance Meter (LCR)

Auto inductive, capacitive and resistive test. Frequency selectable to 120 Hz or 1000 Hz. In AUTO mode, the MTR105 automatically determines if the main element of the load is inductive, capacitive or resistive and displays the result on screen.

Selectable inductance and capacitance test.


Temperature measurement of unit under test, via the supplied thermocouple, allows temperature compensation to be applied in insulation resistance tests.


Full colour graphic display makes the MTR105 simple to understand and easy to use.

Each Unit Includes

  • Hook strap assembly
  • Soft pouch
  • Temperature probe, T type CAT III 600 V
  • IR lead set (comprising of):
    • 3 x Grabber Clips (Red, Black & Blue) CAT III 1000 V, CAT IV 600 V
    • 3 x 4 mm Test leads, 2 m, 1 end Right Angle
    • 1 end straight (red, black & blue) CAT III 1000 V, CAT IV 600 V
    • 3 x Test probes (red, black & blue), long reach (100mm), CAT III 1000 V, CAT IV 600 V


  • Kelvin clip lead set CAT III 600 V (comprising of):
    • 2 x Kelvin Clip leads, 2 metres, 4mm Right Angled Connectors (4), Single (2-core) cable


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Megger BAKER MTR105


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