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Megger 212159 MJ159 Major Megger Hand-Cranked Insulation Resistance Tester 100, 250, 500 & 1000 V; 2 GOhms

Category: Megger
  • No scale multipliers
  • Multiple test voltages for spot and step voltage testing
  • Guard terminal to eliminate surface leakage current
  • Low voltage brushless a.c. generator. Cranking speed between 130 rpm and 170 rpm
  • Available in alternate configurations:
    • 212359 - Dual operation low voltage brushless a.c. generator or 120 V 50/60 Hz mains (line) supply
    • 212459 - Six IEC LR6 cells (AA) Battery life: not less than 1300 insulation or Resistance range tests
    • 212559 - Dual operation 120 V 50/60 Hz mains (line) supply and rechargeable battery. Six NiMh 1800 mAh cells
      Quality is crafted into Megger 212159 MJ159 Major Megger Hand-cranked Insulation Resistance Tester, with excellent test voltage regulation, direct measurement readout and an external guard terminal to eliminate surface leakage current from the measurement. It is portable, self-contained instrument designed to give rapid and accurate measurements.

      Megger 212159 MJ159 Major Megger Hand-cranked Insulation Resistance Tester features an analog display having four selectable test voltages of 100, 250, 500 and 1000 VDC, measuring insulation resistance up to 2000 MΩ,and an ohm range to 5000≈. Power for 212159 is derived from a low-voltage, hand cranked generator which has been designed to be easy to turn even under full load conditions. The low-voltage generator is connected to an electronic inverter to provide a very stable test voltage. Accuracy of measurement is unaffected by variations in the generator cranking speed and the test voltage is maintained at its rated value.

      As a safety feature, the ac voltage range becomes effective as soon as the instrument is connected to the circuit under test. Therefore, a warning is given that the circuit under test is not de-energized before the instrument is operated. Though calibrated for ac voltage, this range also monitors the automatic discharge feature so that after equipment having capacitance (i.e. a cable), has been tested, an indication can be given that the voltage has discharged to a level that is safe for removing the test leads.

      Megger 212159 has a guard terminal which may be used to prevent the effects of surface leakage from influencing the readings. This is achieved by diverting the leakage current through the guard terminal and away from the instrument’s measuring circuit.

      Insulation Range
      Insulation Resistance 0.1Ω - 2000 MΩ
      Accuracy  ±1.25% of fsd on a 2.8 in. (71mm) arc length
      Nominal Test Voltages
      DC Test Voltages 100/250/500/1000 V
      Accuracy 250/500/1000: +30%, -0% max,
      50/100V: +40%, -0% max
      Midscale 4 MΩ
      Short Circuit Current 1.9 mA
      Max Load Capacitance 1 µF with less than ±0.1" pointer movement
      Discharge Up to 1 µF capacitance is discharged
      from 1000 V to less than 42.4 V in less than 4 secs
      Resistance Range 0.1 Ω - 5000 Ω
      Test Voltage Characteristics
      Open Circuit Test Voltage 3 V ±0.2 V
      Short Circuit Current 2 mA ±10%
      Accuracy ±1.25% of fsd on a 2.8 in. (71.1mm) arc length
      Safety Voltage Check
      Voltage measurement 0.1 V - 600 V a.c; the meter is RMS calibrated and average responding
      Safety voltage indicator Indicates the presence of d.c. voltages. Scaling is not the same as the a.c. meter. True d.c. voltage equals scale reading divided by 2.22
      Accuracy  2.5% of full scale
      Power Supply Dual operation low voltage brushless a.c. generator
      or 120 V 50/60 Hz mains (line) supply
      Safety The instruments meet the requirements for double insulation to IEC 1010-1(1995), EN 61010 (1995) to installation Category II, 300 V phase to earth (ground), 600 V installation Category I
      Included Accessories
      • 1 - User Guide
      • 1 - Test lead set (3 leads, 3 prods, 3 clips)
      • 5 - Test record card
      • 1 - Carrying case


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