Catalog index: WMGBMMR630
MMR-630
Measure motor winding resistance and other low resistances
Perform precise tests of objects of resistive and inductive nature using one instrument - small resistance meter Sonel MMR-630.
We present a versatile small resistance meter that provides very high measurement accuracy. The measurement resolution is 0.1 µΩ. The MMR-630 model enables measurements of objects of resistive as well as inductive nature, such as transformers and motors. This is due to the large measurement current for the individual subranges and the corresponding operating modes. When testing objects of a resistive nature, rapid measurement (3 seconds) is applicable. When testing inductive objects, extended measurement is used (there is also the possibility of a shortened mode with a slightly lower measurement accuracy).
The MMR-630 has been enhanced with special functions that allow it to be used also in the production cycle for serial measurements, for example, during the inspection of large batches.
Product features
MMR-630 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-630 | Current | Accuracy | |
| Range | Resolution | ||
| 0…999,9μΩ | 0,1μΩ | 10 A | ±(0,25% m.v. + 2 digits) |
| 1,0000…1,9999 mΩ | 0,0001 mΩ | ||
| 2,000…19,999 mΩ | 0,001 mΩ | ||
| 20,00…199,99 mΩ | 0,01 mΩ | 1 A | |
| 200,0…999,9 mΩ | 0,1 mΩ | 0,1 A | |
| 1,0000…1,9999 Ω | 0,0001 Ω | ||
| 2,000…19,999 Ω | 0,001 Ω | 10 mA | |
| 20,00…199,99 Ω | 0,01 Ω | 0,1 mA | |
| 200,0…1999,9 Ω | 0,1 Ω | 0,1 mA | |
– input impedance of the voltmeter: ≥200 kΩ
„m.v.” – measured value.
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