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MMR-620 Microohmmeter

The MMR-620 is professional portable instrument for measuring very low resistances. Due to their special measurement algorithm he can be used for both resistive and inductive type of a specimen that makes him 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.
  
Manufacturer: SONEL S.A. (Poland).

Features
  • Automatic or manual selection of measuring range (measurement of objects of an inductive nature)
  • Selection of measurement mode according to the type of measured object
  • Selection of measurement mode depending on application (including control of product series)

Range

Resolution

Test current     

Accuracy

0...999 μΩ

1 μΩ

10 A

±(0.25% m.v. + 2 digits)   

1.000...1.999 mΩ

0.001 mΩ

2.00...19.99 mΩ

0.01 mΩ

20.0...199.9 mΩ

0.1 mΩ

1 A

200...999 mΩ

1 mΩ

0.1 A

1.000...1.999 Ω

0.001 Ω

2.00...19.99 Ω

0.01 Ω

10 mA

20.0...199.9 Ω

0.1 Ω

1 mA

200...1999 Ω

1 Ω

0.1 mA

Technical specification

Insulation type

double

Measurement category

III 300 V

Ingress protection

IP54

Protection against external voltage

up to 440 V AC for 10 s

Power supply to battery charger

100 V…250 V/50 Hz…60 Hz, 200 mA

Battery charging time

ca. 2.5 hours

Number of measurements with 10 A current
performed when powered from the battery pack   

300

Maximum wire resistance for 10 A current

0.1 Ω

Accuracy of measuring current setting

± 10%

Dimensions

295 x 222 x 95 mm

Meter weight

1.7 kg

Operating temperature

0°C…+40°C

Charger operating temperature

+10°C…+35°C

Storage temperature

-20°C…+60°C

Humidity

20%…90%

Reference temperature

+23°C ± 2°C

Reference humidity

40%…60%

Temperature coefficient

±0,01% d.v./°C

Time to AUTO-OFF

120 s

TFT graphic display

192 x 64 pixels

Interface standard

RS-232C

Standard accessories:

  • MMR-620
  • 2 x Kelvin clamp 1 kV 25 A
  • 4 x crocodile clip black 1 kV 32 A
  • 2 x double-tip Kelvin probe (banana sockets)
  • Doble-wire test lead 3 m (10 / 25 A)
  • Mains power cable Euro 2-pin plug / IEC C7 plug
  • NiMH battery 4.8 V 3.2 Ah
  • Unisonel hanging straps
  • L1 carrying case
  • RS-232 serial transmission cable
  • User manual

Optional accessories:

  • 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)
  • Kelvin vice with cables
  • USB/RS-232 adapter
  • Sonel Reader software
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