The MMR-630 Series meters are professional portable instruments for measuring very low resistances. Due to their special measurement algorithm they can be used for both resistive and inductive type of a specimen that makes

MMR-630 series perfect instruments for electricians testing electrical junctions, motors and power transformers windings. The results can be stored in the internal memory and send to a computer via serial interface. A quick PASS/FAIL test function with results displayed and acoustically indicated simplifies measurements considerably.

Sonel MMR-630 MicroOhmMeter DLRO ±(0.25% m.v + 2 digits) Accuracy IP54

  • Please allow 4-5 weeks for this product to arrive. 


  • Please see photos and description for full specifications.

    • Measurement of resistive object type:
      - welded and soldered connections, equipotential bonding, earth wire,
      - terminals and connectors, rail welded joints, cables and wires,
      - measurement 4-pole method.
    • Measurement of inductive object type:
      - coils (motors and transformers), low resistance coils.
    • Range selection autoranging or manual (measurement of inductive object type).
    • Selectable measurement mode adjusted to object type:
      - for resistive objects - fast mode (3 seconds),
      - for inductive objects - long mode with automatic discharge after measurements (or with lower accuracy - shorter mode).
    • Selectable measurement mode adjusted to application:
      - normal mode - after pushing „START” button,
      - automatic mode - since test leads are connected to the object meters automatically starts measurement with dual direction current flow and gives average result - what eliminates eventual DC voltage on tested object,
      - continuous mode - every 3 seconds for resistive objects or continuous measurement for inductive objects.
    • Window mode:
      - this option enables setting an upper and a lower limit between which the average measurement result is bound to appear. The results outside of this range will be indicated by two long audible signals and the symbols.
    • MMR-630 is designated not to be effected by interference up to 20 mV and to show noises from 20 to 100 mV (so in edge conditions even 5 times higher than measured drop of potential).
    • Memory store for up to 990 results and a communications facility for transferring data from the device to a PC.

    Electric security:
    - type of insulation: double, according to EN 61010 - 1 and IEC 61557
    - measurement category: CAT III 300 V acc. to EN 61010 - 1
    - protection class acc. to EN 60529: IP54

    Other technical data:
    - meter’s power supply: battery package SONEL/Ni-MH 4,8 V
    - battery charging time: approx. 2,5 hours
    - number of measurements with the current of 10 A: 300
    - auto-off time: 120 seconds
    - immunity to interference: additional error ≤1% for voltage 50 Hz ≤100 mV RMS
    - maximum leads resistance for the 10 A current: 0,1 Ω
    - maximum inductance of the tested object: 40H
    - accuracy of the test current: ±10%
    - resistance measurement time:
    - with the selected resistive object type with the bidirectional current: 3 seconds
    - with the selected inductive object type, dependant on the resistance
    and inductance of the object: a few minutes (max. 10)
    - dimensions: 295 x 222 x 95 mm
    - weight: approx. 1,7 kg

    Rated operational conditions:
    - operation temperature: 0...+40°C
    - storage temperature: -20...+60°C

    MMR-620 microohmmeter conforms the following directives
    or standards according to CE requirements.

    Low Voltage Directive (LVD) 73/23/EEC, 93/68/EEC.

    EN 61010 - 1:2001 Safety requirements for electrical equipment for measurement, control and laboratory use. General requirements .
    EN 61010 - 031:2002: Safety requirements for electrical equipment for measurement, control and laboratory use. Safety requirements for hand-held probe assemblies for electrical measurement and test.

    Electromagnetic compatibility (EMC) 89/336/EEC, 92/31/EEC, 93/68/EEC.

    EN 61326:1997+A1:1998+A2:2001 Electrical equipment for measurement, control and laboratory use - EMC requirements.

For Sales, Calibration, or Repair Services Call 1 (888) 868 - 4546

Contact Us 

750 Oakdale Rd Unit 52

Toronto, Ontario

M3N 2Z4 Canada

Local: (905) 406-0100 

1 (888) 868 - 4546

We Accept

Visit our Top Rated Seller

eBay and Amazon Stores

ebay top rated.png
meatest logo.png
tinsley logo.jpg
keithley logo.png
keysight logo.png
EA logo.PNG
ODA logo.png
isa logo.png
HT logo.jpg
sonel logo.jpg
saluki - Square.jpg
langer logo good.PNG
detectus logo.jpg
megiq logo.PNG
  • Facebook - Grey Circle