Megger MTR105 Specifications

MTR105

Rotating Machine Tester

MTR105

Rotating Machine Tester

■ 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

DESCRIPTION

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.

FEATURES

n Guard terminal, to eliminate any surface leakage current.

n Detachable test leads with interchangeable clips and probes

for different applications.

n Stores test results for up to 256 motors, which can be

downloaded to a USB mass storage device .

n Rotary dial control, full graphic display, simple and easy to

use.

n Environmental protection to IP54, providing protection

against moisture and dust ingress, including the battery and
fuse compartment.

n Tough housing: A ‘rubber over moulding’ combines a tough

shock absorbing outer protection with excellent grip, on a
strong modified ABS housing, providing a robust case.

n Rechargeable batteries with mains charger kit option.

■ Environmental protection to IP54

APPLICATIONS

n Production tests for new manufactured motors and

generators.

n Test repaired and refurbished motors and generators.

n Monitoring and maintenance of in service motors (off line)

in the field.

TYPICAL INDUSTRIES INCLUDE

n Utilities: Electrical power generation, water, oil / gas.

n Industrial: Production line / factory maintenance teams,

HVAC field engineers.

n OEM: Motors / generators.

n Service: Motor repair workshops.

n Transport: Rail, electric vehicles, marine, etc.

SAFETY

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.

n Meets the international requirements of IEC61010 and

IEC61557.

n Live circuit detection and test inhibit on all measurements

with user notification (except for direction of rotation
measurements).

n User selectable insulation test terminal lockout voltage

25 V, 30 V, 50 V, 75 V (default is 50 V).

n Detection and inhibit functions when the protection fuse

has failed.

n Suitable for use on CAT III applications and supply voltages

to 600 V.

MTR105

Rotating Machine Tester

INSULATION RESISTANCE TESTS

n Resistance range 100 Ω up to 200 GΩ.

n Supports PI, DAR, Timed and Temperature Compensation.

n 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.

n 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.

n Dedicated buzzer button either ON, VISUAL or OFF.

n Adjustable buzzer for minimum resistance limit

(0.5 MΩ up to 1000 MΩ).

n Buzzer sounds on test pass.

VOLTMETER

n Measures ac 10 mV up to 1000 V; dc 0 to 1000 V; TRMS

(15 Hz up to 400 Hz).

n Three phase supply and direction of rotation.

CONTINUITY (RESISTANCE) TESTS

n Single automatic resistance range from

0.01 Ω to 1.0 MΩ.

n Automatic test current selection uses the preferred test

current for the load resistance under test
(200 mA up to 4 Ω).

n Bi-directional tests option automatically reverses the current

without reconnecting leads.

n Lead resistance compensation (NULL) operates up to 10 Ω

of resistance.

n Dedicated buzzer switch either ON, VISUAL or OFF.

n Adjustable buzzer for maximum resistance limit

(1 Ω to 200 Ω in 12 steps).

n Buzzer sounds on test pass.

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

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

DISPLAY

Full color 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.

DLRO FOUR WIRE KELVIN LOW RESISTANCE

n Automatic resistance range from 1 mΩ up to 10 Ω.

n Selectable auto or manual test.

n Bi-direction or single direction.

n Bi-directional tests option automatically reverses the current

without reconnecting leads.

n 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.

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