Description MMR 620 Micro Ohmmeter 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 auto-ranging 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 – 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 affected 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, dependent 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. Calibration certificates are issued during the production process. New calibration certificates are available upon request at an additional cost. MMR 620 Micro Ohmmeter
