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Megger Baker MTR105 Rotating Machine Tester

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  • Comprehensive testing for rotating machines such as motors and generators
  • Capable of insulation, rotation, continuity and DLRO low resistance testing
  • Saves 246 complete result sets in internal memory, downloadable via USB
(Ex. VAT) £1,700.00 (Inc. VAT) £2,040.00

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  • Description

    Megger Baker MTR105 Rotating Machine Tester

    Megger MTR105

    The Megger Baker MTR105 Rotating Machine Tester is designed to test multiple aspects of static motors. The large range of test and measurement facilities make the motor tester suitable for production tests on new motors and generators, testing of refurbished or repaired motors and generators, or in-field testing of operational motors or generators. This has applications in multiple industries including the utility sector, manufacturing, HVAC, motor maintenance/repair, and transport.

    Advanced Motor Testing

    Various advanced tests are available on the Megger Baker MTR105 Motor Tester. They include insulation resistance measurement from 100Ω to 200GΩ with polarisation index, dielectric absorption ratio, and temperature compensation. Test voltages of 50V, 100V, 250V, 500V and 1000V are available. Notably, there is also a bi-directional DLRO four-wire Kelvin low resistance test function for resistance measurement up to 10Ω with a resolution of 0.01mΩ and accuracy of ±0.25% ± 10 digits.

    Other measurement capabilities on the Megger Baker MTR105 include bi-directional continuity testing (20mA or 200mA test current), capacitance (0.1nF to 1mF), three-phase AC/DC voltage measurement up to 1000V, phase rotation indication, motor rotation test, and inductance measurement (2mH to 1H). There is also a temperature measurement function via a type T thermocouple with a range of -20˚C to 200˚C (up to 1000˚C with type J or K thermocouple) that facilitates temperature compensation.

    Designed for Practicality

    The Megger MTR105 is operated via a simple rotary dial and push-button interface to select and tailor the test. Readings are displayed on the vibrant colour screen that is capable of both graphical and numerical depictions. The motor tester has internal memory for up to 256 result sets with a time and date stamp and these can be downloaded to a PC via the USB connection.

    The Megger MTR105 has enough battery life to perform a full suite of tests on up to ten motors, or 1200 insulation or continuity tests. The tester’s protective design gives it an IP54 ingress protection rating and the guard terminal prevents surface leakage current. The over-moulded rubber case and ABS housing make it both comfortable and sturdy. Safety is paramount with live circuit detection that prevents unsafe testing and user-adjustable lockout voltage.

    The tester comes supplied with a hook strap, soft carry pouch, type T thermocouple, insulation resistance lead set, and Cat III 600V Kelvin lead set.

    Megger part number: 1010-361

    Key Features

    • Ideal for testing motors and generators
    • Suitable for testing new, repaired or in-service units
    • Full suite of Megger insulation resistance tests
    • DLRO four-wire, low-resistance testing
    • Voltage measurement with phase indication
    • Motor rotation testing
    • Bi-directional continuity testing with 20mA or 200mA test current
    • Inductance and capacitance measurement
    • Temperature measurement with compensation function
    • Vibrant, graphical display
    • Simple rotary dial and push-button interface
    • Downloadable memory for 246 complete test sets
  • Specification

    Insulation resistance

    • Test voltages: 50V; 100V; 250V; 500V; 1000V
    • Test voltage ranges: 10GΩ; 20GΩ; 50GΩ; 100GΩ; 200GΩ
    • Test voltage accuracy: ±2% ± 2 digits ± 4.0% per GΩ; ±2% ± 2 digits ± 2.0% per GΩ; ±2% ± 2 digits ± 0.8% per GΩ; ±2% ± 2 digits ± 0.4% per GΩ; ±2% ± 2 digits ± 0.2% per GΩ
    • Polarisation index: 10min/1 minute ratio
    • Dielectric absorption ratio: User configurable 15s or 30s t1 start time with t2 fixed at 60s
    • Guard terminal performance: <5% error at 500kΩ parallel circuit resistance with 100MΩ load
    • Resolution: 0.1kΩ
    • Short circuit/charge current: 2m +0% -50% (IEC61557-2)
    • Terminal voltage accuracy: -0% + 2% ±2V
    • Test current: 1mA at min. pass value of insulation to a max of 2mA
    • Operation range: 0.10MΩ to 1.0GΩ (IEC61557-2)
    • Leakage current display: 0.1µA resolution 10% (±3 digits)
    • Voltage display: ±3% ±2 digits ±0.5% of rated voltage
    • Note: Above specification only applies when high quality silicone leads are used, as supplied with instrument.


    • Measurement: 0.01Ω to 1MΩ (0 to 1000kΩ analogue scale)
    • Accuracy: ±3% ± 2 digits (0 to 99.9Ω); ±5% ± 2 digits (100Ω to 500kΩ)
    • Test current: 200mA (-0mA +20mA); (0.01Ω – 4Ω)
    • Polarity: Single or dual (factory default) polarity
    • Lead resistance: Null up to 10Ω
    • Selectable current limit: 20mA and 200mA


    • Range: 0.1nF to 1mF
    • Accuracy: 5% ± 2 digits (1nF to 10µF)


    • Range: 0 to 1000V (DC); 10mV to 1000V (AC, TRMS sinusoidal 15Hz to 400Hz)
    • Accuracy: ± 2% ±2 digits (0 - 1000 V DC); ± 2% ±2 digits(10 mV - 1000 V TRMS AC)
    • Frequency range: 15 to 400Hz (50mV to 1000V)
    • Frequency resolution: 0.1Hz
    • Frequency accuracy: ±0.5% ± 1 digit
    • Diode test accuracy: ±2% ± 2 digits (0.01 to 3.00V)
    • Diode test display range: 0.00V to 3.00V

    Temperature measurement and compensation

    • Thermocouple: Type T (Type K and Type J)
    • Thermocouple range: -20 °C to 200 °C (4 °F - 392 °F)
    • Instrument range: -20 °C to 1000 °C (4 °F - 1832 °F)
    • Instrument resolution: 0.1 °C (0.18 °F)
    • Instrument accuracy: ±1.0 °C ±20 digits (1.8 °F).

    (Basic accuracy stated assumes forward and reverse measurements.)

    DLRO four wire Kelvin low resistance

    • Test current: 200 mA dc
    • Range: 1 mΩ to 10 Ω
    • Resolution: 0.01 mΩ
    • Accuracy: ± 0.25% rdg. ± 10 digits, accuracy stated includes forward and reverse measurements.



    • 2mH;
    • 20mH;
    • 200mH;
    • 1H


    • ±(0.7 % +(Lx/10000) % +5 digits) @ 1 kHz
    • ±(1.0 % +(Lx/10000) % +5 digits) @ 120 Hz; ±(0.7 % +(Lx/10000) % +5 digits) @ 1 kHz
    • ±(2.0 % +(Lx/10000) % +5 digits) @ 120 Hz; ±(1.2 % +(Lx/10000) % +5 digits) @ 1 kHz
    • ±(2.0 % +(Lx/10000) % +5 digits) @ 1 kHz only

    Results storage

    • Storage capacity: 256 motor results (date / time stamped)
    • Data download: USB Type A (USB Mass Storage Device)


    • Battery: 6 x IEC LR6 1.5 V Alkaline (AA); IEC FR6 1.5 V Lithium (LiFeS2); IEC HR6 1.2 V NiMH (rechargeable option).
    • Battery life: 10 motors per (complete suite of tests at 100 V into 100 MΩ). IEC61557-2 - test cycle, 1200 insulation tests with duty cycle of 5 s testing on 25 sec standby @ 500 V into 0.5 MΩ. IEC61557-4 test cycle, 1200 continuity tests with duty cycle of 5 sec testing on 25 sec standby on 1 Ω resistance.
    • Battery charging: Mains battery charger kit.
    • Safety protection: IEC61010-1 CAT III 600 V
    • EMC: Industrial IEC61326
    • Temperature coefficient: <0.1% per °C up to 1 GΩ


    • Operating temperature range: -10 °C to 50 °C (14 °F to 122 °F)
    • Storage temperature range: -25 °C to 65 °C (-13 °F to 149 °F)
    • Humidity: 90% RH at 40 °C (104 °F) max.
    • Calibration temperature: 20 °C (68 °F)
    • Maximum altitude: 3000 m (9843 ft.)
    • IP rating: IP54


    • Display: Full LCD colour screen with user configurable backlight
    • Languages: English, French, German and Spanish.
    • Dimensions: 228 x 105 x 75 mm (8.98 x 4.1 x 2.95 in)
    • Weight: 1.00 kg (2.2 lbs)
    • Fuse: x2 500 mA (FF) 1000 V 32 x 6 mm ceramic fuse, high break capacity HBC, 30 kA minimum. Glass fuses must not be installed.
  • Supplied Accessories

    • Megger Baker MRT105 Rotating Machine Tester
    • Hook strap assembly
    • Soft pouch
    • Type T thermocouple
    • 3 x grabber clips (red, black, blue) Cat III 1000V, Cat IV 600V
    • 3 x 4mm test leads, 2m, 1 end right angle, 1 end straight (red, black, blue) Cat III 1000V, Cat IV 600V
    • 3 x test probes (red, black, blue), long reach (100mm), Cat III 1000V, Cat IV 600V
    • 2 x Kelvin clip leads, 2 metres, 4mm right-angled connectors (4) single (2-core) cable
  • Product Documents

    Product Attachments

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