Cầu đo điện trở một chiều Sonel MMR-620 (1μΩ ~1999,9 Ω)

DESCRIPTION

The MMR-620 Series meters are professional portable instruments for measuring very low resistances. Due to their special measurement algorithm they can be used for both resistive and inductive type of a specimen that makes MMR-620 a perfect instrument for electricianstesting electrical junctions, motors and power transformers windings.The results can be stored in the internal memory and send to a computer via serial interface. A quick PASS/FAIL test function with results displayed and acoustically indicated simplifies measurements considerably. The MMR-620 meter can also be used for testing the quality of the junctions in a production process via the interface.

• • 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

Data sheet

Manual