Sonel MMR-620 Micro Ohmmeter

Measure motor winding resistance and other low resistances

The Sonel MMR-620 Micro Ohmmeter enables accurate measurements of both connections resistance (welded, soldered, bolted) and winding resistance of electrical motors and power transformers.

Measurements of objects resistive in nature

• Welded and soldered connections, equipotential bondings, earthing conductors
• Contacts, welds of rails, conductors and cables
• Measurement according to the four-lead method

Measurements of objects inductive in nature:

• Motor windings
• Low-resistance coils

Additional functions

• 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:
  • Fast measurement (3 seconds) for measurement of objects of a resistive nature
  • Extended measurement for testing of objects of an inductive nature (accelerated mode, with slightly worse accuracy, available)
  • With automatic discharging of the object after measurement
• Selection of measurement mode depending on application (including control of product series):
  • Measurement in normal mode – triggered when the “START” button is pressed
  • Measurement in automatic mode – the instrument awaits connection of all four test leads to the object, after which it automatically start measurement in one or both directions and calculates the mean resistance value
  • Measurement in continuous mode – the meter repeats successive measurement cycles with breaks every 3 seconds (for objects of a resistive nature) or performs measurement continuously (for objects of an inductive nature).
• Window mode:
  • Makes possible to set an upper and lower limit within the measurement result.should remain; sound signal triggered when the result is beyond set range
  • Capability of performing measurements even under disturbances of a value five times greater than the measured signal

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