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Megger MTR105 Rotating Machine Tester

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1010-361
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The Megger MTR105 Rotating Machine Tester is a handheld, durable and versatile static motor tester. The Megger MTR105 Rotating Machine Tester can also be used as an insulation resistance tester, DLRO (Digital Low Resistance Ohmmeter), voltmeter and LCR meter. Additionally, it is equipped with a thermocouple for measuring the temperature of the units-under-investigation; this, in turn, facilitates temperature-compensated insulation resistance tests.

For a quick introduction to the Megger MTR105 Rotating Machine Tester's measurement capabilities please see the following video and bullet points.

Insulation Resistance Tests

  • Range: 100Ω to 200GΩ
  • Supports PI, DAR, timed and temperature compensation
  • Stabilised insulation test voltage provides a more accurate test voltage without risking over-voltage damage to circuits or components. The output voltage is maintained between 0 and 2% throughout the test range and is accurate to ±2V
  • Variable test voltage range: 10V to 999V. This allows the user to select the exact voltage when a non-standard voltage is required; this voltage is also subject to stabilised output control (above)
  • Buzzer button: ON, VISUAL or OFF options
  • The buzzer can be adjusted to accommodate the required minimum resistance limit: 0.5MΩ to 1000MΩ
  • Buzzer alert issued when the test has been passed

Voltmeter

  • 10 mV to 1000V AC
  • 0 to 1000V DC
  • TRMS: 15Hz to 400 Hz
  • Three-phase supply and direction of rotation

Continuity (Resistance) Test

  • Single automatic resistance range: 0.01Ω to 1.0MΩ
  • Automatic test current selection uses the preferred test current for the load resistance under investigation (200 mA up to 4Ω)
  • Bi-directional test: automatically reverses the current, removing the need to reconnect the test leads
  • Lead Resistance Compensation/ NULL: nullifies up to 10Ω of test lead resistance
  • Dedicated buzzer switch: ON, VISUAL or OFF
  • When a test is passed the buzzer will sound
  • The buzzer can be programmed to accommodate the maximum resistance limit: 1Ω to 200Ω in 12 steps

DLRO: Four-Wire Kelvin Low Resistance

  • Automatic resistance range: 1mΩ to 10Ω
  • 200mA test current
  • Auto and manual test options
  • Bi-direction and single direction options
  • Bi-directional tests automatically reverse the current removing the need to reconnect leads

Motor Direction of Test

  • The motor is rotated in one direction and the phase sequence is indicated on the display
  • The motor is rotated in the opposite direction; the phases are checked and indicated on the display

Inductance, Capacitance and Resistance Meter (LCR)

  • Auto inductive, capacitive and resistive tests
  • Selectable frequency: 120Hz or 1000Hz
  • Auto mode: automatically determines and indicates whether the main element of the load is inductive, capacitive or resistive
  • Selectable inductance and capacitance test

Test results are indicated via the Megger MTR105 Rotating Machine Tester’s full-colour graphic display. The test results for up to 256 motors can be recorded to the Megger MTR105 Rotating Machine Tester; these results can be downloaded to a USB drive. Test results downloaded to a USB device can be accessed by plugging the USB into a PC with Megger’s PowerDB Test Data Management Software installed.

Required tests are easily accessible using the rotary dial; other practical features present on the Megger MTR105 Rotating Machine Tester include guard terminals designed to eliminate surface leakage current whilst detachable test leads with interchangeable clips and probes allow the user to adapt this handheld static motor tester for various applications quickly and easily.

Additionally, the Megger MTR105 Rotating Machine Tester has been constructed to include a tough, rubber over-moulding laid on top of a strong modified ABS housing: the rubber over-moulding provides shock-absorbing outer protection whilst improving the Megger MTR105 Rotating Machine Tester’s grip. This robust instrument has an environmental protection rating of IP54 ensuring that the entire unit, including the battery and fuse compartment, is protected against dust and water ingress.  

Further to this, the Megger MTR105 Rotating Machine Tester is equipped with several safety features and has a safety protection rating of CAT III 600V up to 3000m. This instrument is also compliant with IEC61010 and IEC61557 requirements. Its fast-detecting circuitry reduces the possibility of damage to the unit if it is accidentally connected to live circuits or across phases; it will issue a notification when accidentally connected to a live circuit, as well as halt the testing procedure (except when conducting direction of rotation measurements). The Megger MTR105 Rotating Machine Tester also features detection and inhibit functions when the protection fuse has failed and features a user-selectable insulation test terminal lockout voltage (25V, 30V, 50V and 75V, the default is 50V).

The Megger MTR105 Rotating Machine Tester’s extensive testing capabilities and durable, safe design make it suitable for a variety of applications across a range of industry sectors. For example, this instrument can be used across the utilities, industrial, OEM, service and transport industries in the following capacities:

  • Testing repaired and refurbished motors and generators
  • Monitoring and maintaining in-service motors (offline) in the field
  • Testing newly manufactured motors and generators

The Megger MTR105 Rotating Machine Tester is a versatile, real-world handheld motor tester, voltmeter, DLRO, insulation resistance tester and LCR meter suitable for checking a range of motors across numerous industries.

Megger MTR105 Rotating Machine Tester Key Features

  • A handheld, durable and versatile static motor tester
  • Can also be used as an insulation resistance tester, DLRO, voltmeter and LCR meter
  • Equipped with a thermocouple for measuring the temperature of the unit-under-investigation
  • Temperature-compensated insulation resistance tests
  • Insulation resistance range: 100Ω to 200GΩ
  • Supports PI, DAR, timed and temperature compensation
  • Stabilised insulation test voltage provides a more accurate test voltage without risking over-voltage damage to circuits or components
  • The output voltage is maintained between 0 and 2% throughout the test range and is accurate to ±2V
  • Variable test voltage range: 10V to 999V
  • Select the exact voltage when a non-standard voltage is required; this voltage is also subject to stabilised output control
  • Insulation resistance buzzer button: ON, VISUAL or OFF options
  • The buzzer can be adjusted to accommodate the required minimum resistance limit: 0.5MΩ to 1000MΩ
  • The insulation resistance buzzer alert is issued when the test has been passed
  • Voltmeter AC range: 10 mV to 1000V AC
  • Voltmeter DC range: 0 to 1000V DC
  • TRMS: 15Hz to 400 Hz
  • Three-phase supply and direction of rotation
  • Single automatic continuity/ resistance range: 0.01Ω to 1.0MΩ
  • Automatic test current selection uses the preferred test current for the load resistance under investigation (200 mA up to 4Ω)
  • Bi-directional test: automatically reverses the current, removing the need to reconnect the test leads
  • Lead Resistance Compensation/ NULL: nullifies up to 10Ω of test lead resistance
  • Dedicated continuity/ resistance buzzer switch: ON, VISUAL or OFF
  • When a continuity/ resistance test is passed the buzzer will sound
  • The continuity/ resistance buzzer can be programmed to accommodate the maximum resistance limit: 1Ω to 200Ω in 12 steps
  • Automatic DLRO resistance range: 1mΩ to 10Ω
  • DLRO: 200mA test current
  • Auto and manual test DLRO options
  • Bi-direction and single direction DLRO options
  • Bi-directional DLRO tests automatically reverse the current removing the need to reconnect leads
  • Motor direction of test: tests the direction of rotation of the motor-under-test and displays the phase sequence
  • LCR meter: auto inductive, capacitive and resistive tests
  • LCR meter selectable frequency: 120Hz or 1000Hz
  • LCR meter Auto mode: automatically determines and indicates whether the main element of the load is inductive, capacitive or resistive
  • Selectable inductance and capacitance test
  • Full-colour, graphic display
  • Test results for up to 256 motors can be saved
  • Download test results to a USB drive
  • View results on a PC with the Megger PowerDB Test Data Management Software (NOT included) installed
  • Rotary Dial control
  • Guard terminals eliminate surface leakage current
  • Detachable test leads and interchangeable clips and probes
  • Tough, rubber over-moulding covering a strong ABS housing
  • The rubber over-moulding provides shock-absorbing outer protection and improved grip
  • IP54
  • CAT III 600V up to 3000m
  • Compliant with IEC61010 and IEC61557
  • Fast detecting circuitry reduces the possibility of damage to the unit if accidentally connected to a live circuit or across phases
  • Issues a notification when accidentally connected to a live circuit and will halt testing procedures (except when conducting direction of rotation measurements)
  • Detection and inhibit functions for when the protection fuse has failed
  • User-selectable insulation test terminal lockout voltage (25V, 30V, 50V and 75V, default is 50V)
  • Suitable for use in the utilities, industrial, OEM, service and transport industries
  • Test repaired and refurbished motors and generators
  • Monitor and maintain in-service motors (offline) in the field
  • Test newly manufactured motors and generators
  • A versatile, real-world handheld motor tester, voltmeter, DLRO, insulation resistance tester and LCR meter
  • Suitable for checking a range of motors across numerous industries

What’s Included?

  • Megger MTR105 Rotating Machine Tester 
  • Hook Strap Assembly
  • Soft Pouch
  • Type-T Temperature Probe
  • 3x Grabber Clips (Red, Black and Blue) CAT III 1000V, CAT IV 600V
  • 3x 4mm Test Leads (Red, Black and Blue), 2m, 1 End Right-angle, 1 End Straight CAT III 1000V, CAT IV 600V
  • 3x Long Reach, 100mm Test Probes (Red, Black and Blue) CAT III 1000V, CAT IV 600V
  • 2x Kelvin Clip Lead, 2m
  • 4x 4mm Right-angled Connector
  • 1x Single, 2-core Cable
Part Code1010-361

Megger MTR105 Rotating Machine Tester Technical Specifications 

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.
Continuity 
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
Capacitance 
Range 0.1 nF - 1 mF
Accuracy ±5.0% ±2 digits (1 nF - 10 μF)
Voltmeter 
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.
Inductance 
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)
Power
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
Environment 
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
Physical
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.
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