MTR105 Rotating Machine Tester
The MTR105 rotating machine tester 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 handheld instrument. Additionally, the MTR105 incorporates temperature measurement and compensation (for IR tests), motor direction of rotation, and supply phase rotation tests.
What's more, the MTR105 has been 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.
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
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
Instrument accuracy
Range | Accuracy | Test Frequency
1 H | ±(0.7 % +(Lx/10000) % +5 digits) | 1 kHz
200 mH | ±(1.0 % +(Lx/10000) % +5 digits) | 120 Hz
200 mH | ±(0.7 % +(Lx/10000) % +5 digits) | 1 kHz
20 mH | ±(2.0 % +(Lx/10000) % +5 digits) | 120 Hz
20 mH | ±(1.2 % +(Lx/10000) % +5 digits) | 1 kHz
2 mH | ±(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)
