Catalog index: WMGBMMR620
MMR-620
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.
- 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.
Specification
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.
Directive:
Low Voltage Directive (LVD) 73/23/EEC, 93/68/EEC.
Standards:
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.
Directive:
Electromagnetic compatibility (EMC) 89/336/EEC, 92/31/EEC, 93/68/EEC.
Standards:
EN 61326:1997+A1:1998+A2:2001 Electrical equipment for measurement, control and laboratory use – EMC requirements.
Resistance measurement
| MMR-620 | Current | Accuracy | |
| Range | Resolution | ||
| 0…999μΩ | 1μΩ | 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 | 0,1 mA | |
| 200…1999 Ω | 1 Ω | 0,1 mA | |
– input impedance of the voltmeter: ≥200 kΩ
„m.v.” – measured value.
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