Megger MTR105 Rotating Machine Motor Tester

Original price was: ৳ 390,000.00.Current price is: ৳ 380,000.00.

The rotating machine tester comes equipped with the test abilities of proven IR test instruments adding DLRO four-wire Kelvin low resistance, inductance, and capacitance tests to give a versatile motor tester.

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



  • Full color graphic display
  • Three 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 9842.5′ (3000 m)
  • Environmental protection to IP54


  • Utilities: electrical power generation, water, oil/gas
  • Industrial: production line/factory maintenance teams, HVAC/R field engineers
  • OEM: motors/generators
  • Service: motor repair workshops
  • Transport: rail, electric vehicles, marine, and more
  • 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


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
  • Stabilised 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 stabilised output control
  • Dedicated buzzer button either ON, VISUAL or OFF
  • Adjustable buzzer for minimum resistance limit (0.5 up to 1000 MΩ)
  • Buzzer sounds on test pass


  • Measures ac 10 mV up to 1000 V; DC 0 to 1000 V; True RMS (15 up to 400 Hz)
  • Three phase supply and direction of rotation

Continuity (Resistance) Tets

  • 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.

Guard Terminal

The Guard Terminal (G) is a third terminal on the connection panel. Connection of the guard terminal, on certain applications, provides a return path for parallel leakage currents, which could otherwise create significant errors in the insulation measurement. This is especially so for surface contamination of equipment or cables.


Insulation Resistance
Volts 50 to 1000 V
Accuracy 10 GΩ ±2% ±2 digits ±4.0% per GΩ
20 GΩ ±2% ±2 digits ±2.0% per GΩ
50 GΩ ±2% ±2 digits ±0.8% per GΩ
100 GΩ ±2% ±2 digits ±0.4% per GΩ
200 GΩ ±2% ±2 digits ±0.2% per GΩ
Polarization Index (PI) 10/1 minute ratio
Dielectric Absorption Ratio (DAR) User configurable 15 or 30 s t1 start time with t2 fixed at 60 s
Guard Terminal Performance <5% error at 500 kΩ parallel circuit resistance with 100 MΩ load
Resolution 0.1 kΩ
Short Circuit/Charge Current 2 mA +0% -50% (IEC61557-2)
Terminal Voltage Accuracy -0% +2% ±2 V
Test Current 1 mA at min. pass value of insulation to a max. of 2 mA
Operation Range 0.10 MΩ to 1.0 GΩ (IEC61557-2)
Leakage Current Display 0.1 uA resolution 10% (±3 digits)
Voltage Display ±3% ±2 digits ±0.5% of rated voltage


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