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Winding Resistance and Low Resistance Meter

Index cat. WMUSMMR650

ean 5907624027176

Ingress protection: IP 67

Measurement category: CAT III 600 V, CAT IV 300 V

Data transmission: LAN, USB, Wi-Fi

Display: touchscreen, graphic, color, backlit

5 550,00 $

few pieces left

Delivery: 24h

Additional accessories

Double-wire test lead 10 m (Kelvin crocodil...

401,63 $


Double-wire test lead 25 m (Kelvin crocodil...

615,83 $


Double-wire test lead 10 m U1/I1 with banan...

244,55 $


Double-wire test lead 10 m U2/I2 with banan...

244,55 $


Doble-wire test lead 6 m (10 /25 A) U1/ I1

141,02 $


Doble-wire test lead 6 m (10 /25 A) U2/ I2

141,02 $


2-core test lead 15 m blue (10 / 25 A) U2/I...

367,71 $


2-core test lead 15 m blue (10 / 25 A) U1/I...

367,71 $


Barcode scanner 2D (USB)

480,17 $


Double pin Kelvin probe with banana connect...

76,75 $


Measure winding resistance and low resistance with MMR-650

Ready to work even in extreme conditions, the winding resistance and small resistance meter Sonel MMR-650 has been created to accurately measure small resistances of resistive and inductive objects. The instrument can be used to measure the resistance of both transformer windings - including amorphous-core transformers - and resistive objects. The MMR-650 meter is dedicated to use in power plants, maintenance companies and railway industry, among others.

Product 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


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.

MMR-650 can be also utilized on production lines (eg. at the final production control stage).

Device capabilities

The MMR-650 winding resistance and low resistance meter provides an innovative combination of a high-performance measuring device with a modern user interface and advanced data management system. Wireless data transmission, enhanced system of 2D codes and ability to print labels to identify test items, all contribute to bringing new quality of work and allow the user to perform a wide range of measurements.

Easy readout

The MMR-650 winding resistance and low resistance meter is equipped with a readable colour touchscreen that, due to its 800 x 480 pixel resolution, provides both high comfort of interacting with the interface and high readability of the measurement results.

Durable and practical casing

In response to the customers needs the MMR-650 microohmmeter has been designed to operate in difficult environmental conditions. A unique casing with the IP67 ingress protection rating ensures that the device is both waterproof and dustproof.