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Megger MTR105 Rotating Machine Tester 1010-361

The MTR105 is a dedicated Static Motor Tester with Megger’s tried and trusted suite of insulation resistance tests (IR), plus all the great traditional features and reliability of Megger’s testers.

Important Calibration Information

This instrument comes with a manufacturers calibration certificate.
Please see 'Calibration Options' in the description for more details.

Next Day Delivery (subject to availability)

£1,700.00 excluding VAT £2,040.00 including VAT @ 20%
  • 3 Phase insulation resistance
  • Capacitance and inductance
  • CAT III 600 V up to 3000 m
  • Continuity and diode test
  • DLRO four wire Kelvin
  • Full colour graphic display
  • Motor direction of rotation
  • Temperature correction for insulation resistance
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  • Description
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Megger MTR105 Rotating Machine Tester


The MTR105 is a dedicated Static Motor Tester with Megger’s tried and trusted suite of insulation resistance tests (IR), plus all the great traditional features and reliability of Megger’s 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.

*Important Calibration Information:

This instrument comes complete with the manufacturers calibration certificate. Please be aware that these certificates are generic and may also be time lapsed. If you would prefer a personalised full traceable calibration certificate applied to the equipment before dispatch, then please select this option from the drop-down menu above, an additional calibration charge will apply.

Megger MTR105 Comes Supplied With:

  • MTR105 Rotating Machine Tester 1010-361
  • 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.

Key Features:

  • Full colour 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.

  • 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.

Insulaton 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 MΩ up to 1000 MΩ).
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 4 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.

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.

Storage and Download of Results

Test results can be downloaded to a USB mass storage device , which can be accessed by connecting to a PC or a Laptop running PowerDB

Instrument Software Updates

Occasional information bulletins and software updates may be issued on the Megger web site.


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.

ISSWWW and Megger

The extensive Megger product portfolio provides electrical test equipment for an exceptionally wide range of applications at any point of the electricity network. From small handheld low voltage equipment such as multifunction installation testers through to high voltage asset test equipment like insulation resistance testers, circuit breaker analysers, protection relay test systems to transformer condition measurement devices.

Megger designs and manufactures portable electrical test equipment in factories located in Germany, Sweden, the UK, and USA. Megger products help you install, improve efficiency, reduce cost and extend the life of you or your customers’ electrical assets.

Established in the late 1800s, the company has been designing and making test and measurement instruments that perform electrical measurements for preventative maintenance, troubleshooting and commissioning for decades. Megger products have supported customers all over the world to improve their facilities’ efficiency, reduce costs, extend the life of apparatus and through trending and analysis, anticipate equipment failure and future performance.
Being a brand synonymous with the industry and a cornerstone pioneer of many of today’s everyday items of test equipment, ISSWWW are proud to bring you Megger’s full range of equipment and services, now and into the future.
Megger MTR105 Rotating Machine Tester Specification
Specifications - All quoted accuracies are at 20ºC (68ºF)
Insulation resistance
Volts Accuracy
50 V 10 GΩ ±2% ±2 digits ±4.0% per GΩ
100 V 20 GΩ ±2% ±2 digits ±2.0% per GΩ
250 V 50 GΩ ±2% ±2 digits ±0.8% per GΩ
500 V 100 GΩ ±2% ±2 digits ±0.4% per GΩ
1000 V 200 GΩ ±2% ±2 digits ±0.2% per GΩ
Polarisation index (PI) 10 min / 1 minute ratio
Dielectric absorption ratio (DAR) User configurable 15 s 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
Note Above specifications only apply when high-quality silicone leads are being used - as supplied with the instrument.
Measurement 0.01 Ω to 1 MΩ (0 to 1000 kΩ analogue scale)
Accuracy ±3% ±2 digits (0 to 99.9 Ω
±5% ±2 digits (100 Ω - 500 kΩ)
Test current 200 mA (–0 mA +20 mA) (0.01 Ω - 4 Ω)
Polarity Single or Dual (factory default) polarity
Lead resistance Null up to 10 Ω
Selectable current limit 20 mA and 200 mA
Range 0.1 nF - 1 mF
Accuracy ±5.0% ±2 digits (1 nF - 10 μF)
Range dc: 0 - 1000 V
ac: 10 mV - 1000 V
TRMS sinusoidal (15 Hz - 400 Hz)
Accuracy dc: ± 2% ±2 digits (0 - 1000 V)
ac: ± 2% ±2 digits
(10 mV - 1000 V TRMS)
Frequency range 15 - 400 Hz (50 mV - 1000 V)
Frequency resolution 0.1 Hz
Frequency accuracy ±0.5% ±1 digit
Diode Test Diode test accuracy: ±2% ±2 digits 0.01 V to 3.00 V
Display range 0.00 V to 3.00 V
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.
Range Accuracy Test Frequency
1 H ±(0.7 % +(Lx/10000) % +5 digits) 1 kHz
200 mH ±(1.0 % +(Lx/10000) % +5 digits) 120 Hz
±(0.7 % +(Lx/10000) % +5 digits) 1 kHz
20 mH ±(2.0 % +(Lx/10000) % +5 digits) 120 Hz
±(1.2 % +(Lx/10000) % +5 digits) 1 kHz
2 mH ±(2.0 % +(Lx/10000) % +5 digits) 1 kHz only
Results Srorage 
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.

Standard FREE 3-5 Day Courier Delivery – UK Mainland only - Zones A & B
Included in the price for all orders over £40.00 (exc vat). Sent using express courier, delivered within 3-5 working days from the date of your order, subject to availability.

Standard 1-2 Day Express Courier Delivery – UK Mainland only - Zones A & B
£4.50 for all all orders under £40.00 (exc vat). Sent by express courier, delivered within 1-2 working days from the date of your order, subject to availability.

Express Courier 1-2 Day Delivery – UK Mainland only - Zones A & B
£4.50 select at the checkout. Sent using express courier.

Next Day Delivery – UK Mainland only - Zones A & B
£8.00 select at the checkout. Sent using express courier, orders must be placed before 3pm for next day delivery, subject to availability.

Saturday Pre 12am - UK Mainland only - Zones A & B
£15.00 select at the checkout. Sent using express courier, orders must be placed before 3pm for Saturday delivery.

Orders must be placed before 3pm for next day delivery and a telephone number supplied, subject to availability.
Please note that predicted delivery times are based on regular trading days Monday to Friday. Public holidays, bank holidays and weekends are outside the usual scope of our dispatch and therefore may incure additional days lead time to your order.

Orders requiring calibration. Whilst we take the greatest care to get all orders dispatched and delivered to you in the stated time frame, orders received late afternoon and requiring calibration may on occasion miss dispatch that day, according to the complexity of the calibration. Be assured they will ship on the next dispatch, this in most cases should not add more than 24 hours to you delivery.

Delivery Surcharges
Because of the high cost of carriage we need to apply a surcharge on all deliveries made in the following regions bringing the carriage charges to:

  • Zones A & B  - Mainland delivery rates apply. 
  • Zone C - Scottish Highlands. 
  • Zone D - Outer Hebrides, Orkney Isles, Shetland Isles, Isle of Man, Scilly Isles, and Channel Islands.
  • Zone E - Northern Ireland
  • Zone F - Republic of Ireland

New Postage Map Sept 2018> 

International delivery

International delivery charges are automatically added to your order at the checkout; you can also use the guide below for a guide on prices. For any questions regarding international deliveries please contact us at

If no shipping option is available to your selected country please call us on +44 (0) 1603 406 148 to purchase your items.