Logo_ESKAN.png
UA EN

MMR-650 Microohmmeter

The MMR-650 winding resistance and low resistance meter is designed to measure very low very low resistance of both windings - including amorphous core transformers - and resistive objects. This product is made to be used in power plants, railways and maintenance companies to measure resistance of windings of power transformers and motors, breakers, contacts, earthing conductors, equipotential bondings, welded and soldered connections, bolted connections, and other resistive and inductive objects.

Manufacturer: SONEL S.A. (Poland).

Description


Features
  • Measurement of winding resistance (inductive objects including amorphous core transformers)
  • Measurement of very low resistance
  • Transformer core demagnetization function
  • Automatic temperature compensation function (temperature probe)
  • Function of determining the temperature of a motor under load
  • High immunity to disturbances

Resistance measurement

Range

Resolution

Test current   

Accuracy

0…999.9 μΩ

0.1 μΩ

10 A

±(0.25% m.v. + 2 digits)

1.0000…1.9999 mΩ

0.0001 mΩ

2.000…19.999 mΩ

0.001 mΩ

20.00…199.99 mΩ

0.01 mΩ

10 A / 1 A

200.0…999.9 mΩ

0.1 mΩ

1 A / 0.1 A

1.0000…1.9999 Ω

0.0001 Ω

2.000…19.999 Ω

0.001 Ω

0.1 A

20.00…199.99 Ω

0.01 Ω

10 mA

200.0…1999.9 Ω

0.1 Ω

1 mA

Technical specification

Insulation type

double

Measurement category

III 600 V

Ingress protection

IP67 with closed housing

Protection against external voltage

up to 600 V AC for 10 s

Power supply to battery charger

90 V…265 V/50 Hz…60 Hz, 2 A

Battery charging time

approximately 3.5 hours

Number of measurements (of resistive objects) with 10 A current   
performed when powered from the battery pack

700…800 depending on the ambient temperature

Maximum wire resistance for 10 A current

300 mΩ

Accuracy of measuring current setting

± 10%

Dimensions

318 x 257 x 152 mm

Meter weight

approx. 3.5 kg

Operating temperature

-10°C…+50°C

Charger operating temperature

0°C…+45°C

Storage temperature

-20°C…+60°C

Humidity

20%…90%

Reference temperature

+23°C ± 2°C

Reference humidity

40%…60%

Altitude (above sea level)

<2000 m

Temperature coefficient

±0.01% of d.v./°C ± 0.1 digit/°C

Time to AUTO-OFF

5…45 minutes or option not active, depending on the setting

TFT graphic display

800 x 480 pixels

Interface standard

USB, LAN, Wi-Fi

Standard accessories:

  • MMR-650
  • Double pin Kelvin probe (2 pcs.)
  • Kelvin crocodile (2 pcs)
  • 3 m doublewire cable
  • Temperature probe ST-3
  • Mains cable - IEC C13 plug
  • L-11 carrying case
  • Li-Ion rechargeable battery 7.2 V
  • USB cable
  • Sonel Reader PC software
  • User manual

Optional accessories:

  • Kelvin vice with cables
  • 10 m double-wire test lead (Kelvin crocodile clip / banana plug)
  • 25 m double-wire test lead (Kelvin crocodile clip / banana plug)
  • D2 portable USB report / barcode printer (Sato)
  • Label roll – black on white for D2 printer (SATO)
  • Ribbon for D2 printer (SATO)
  • Barcode scanner 2D (USB)
  • ST-1 temperature probe
  • LAN cable (RJ45)
Back to the list