MMR-620

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Measure motor winding resistance and other low resistances

Possibility to measure objects of resistive and inductive nature with the use of versatile small resistance meter Sonel MMR-620.

We present a professional small resistance meter MMR-620, which ensures high measuring accuracy - the measurement resolution is 1 µΩ. With the use of this device it is possible to perform measurements of objects of both resistive and inductive nature (e.g. testing of transformers or motors). The meter provides a high measuring current for individual subranges and various operating modes, adjusted to the type of measured object - quick measurement mode (3 sec) for testing objects of resistive nature, as well as extended measurement mode for testing objects of inductive nature.
Product features
MMR-620 microohmmeter 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.

Resistance measurement

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	10 A	±(0.25% m.v. + 2 digits)
2.00...19.99 mΩ	0.01 mΩ	10 A	±(0.25% m.v. + 2 digits)
20.0...199.9 mΩ	0.1 mΩ	1 A	±(0.25% m.v. + 2 digits)
200...999 mΩ	1 mΩ	0.1 A	±(0.25% m.v. + 2 digits)
1.000...1.999 Ω	0.001 Ω	0.1 A	±(0.25% m.v. + 2 digits)
2.00...19.99 Ω	0.01 Ω	10 mA	±(0.25% m.v. + 2 digits)
20.0...199.9 Ω	0.1 Ω	1 mA	±(0.25% m.v. + 2 digits)
200...1999 Ω	1 Ω	0.1 mA	±(0.25% m.v. + 2 digits)

m.v. - measured value

Datasheet GB

Declaration of conformity