MEGGER MJ159-MJ359 and 210170 Major Megger Insulation Testers

Portable, self-contained instruments designed to give rapid and accurate measurements. Four of the models feature an analog display having four selectable test voltages of 100, 250, 500 and 1000 V dc, measuring insulation resistance up to 2000 MΩ and an ohm range to 5000 ohms. The other model has four test voltages of 50, 100, 250 and 500 V dc measuring insulation resistance up to 1000 MΩ.

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SKU: 3788

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MEGGER MJ159-MJ359 and 210170 Major Megger Insulation Testers

The MJ159, MJ359, and 210170 Major Megger insulation resistance testers are advanced instruments designed to meet the demanding needs of high-voltage insulation testing. These models excel in providing precise test voltage regulation, making them perfect tools for measuring insulation resistance, especially when higher ranges are necessary.

Each of these testers incorporates a cutting-edge design that features an external guard terminal. This addition significantly helps in eliminating surface leakage current from the measurements, enhancing the accuracy and reliability of the tests. The use of all-electronic components allows these devices to generate a regulated DC high voltage. They employ low-zero-drift, high-accuracy circuits with high current sensitivity to ensure precision in every reading.

Portability is a key aspect of the MJ159, MJ359, and 210170 models. Each unit is housed in a molded, impact-resistant, flame-retardant case made from ABS plastic, which includes a fold-down carrying handle for easy transport. This design not only ensures durability but also user convenience in various testing environments.

The MJ159 and 210170 models are particularly notable for their unique power generation mechanism. They are equipped with low-voltage, hand-cranked generators designed to be effortlessly operated even under full load conditions. The generated voltage is then stabilized through an electronic inverter, guaranteeing that the test voltage remains constant irrespective of the cranking speed.

The MJ159 offers four selectable test voltages—100, 250, 500, and 1000 V DC—and can measure insulation resistance up to 2000 MΩ, with an ohm range extending to 5000 Ω. It shares several features with the MJ359, which, however, relies on either a 120 V AC 50/60 Hz source or a similar low-voltage generator for power.

The 210170 model stands out with its capability to perform high-resistance readings up to 20,000 MΩ and insulation resistance measurements that can reach up to 20 GΩ across all voltage ranges. It includes a comprehensive calibration in megohms, ohms, and AC volts. Additionally, it features a continuity range from 0 to 5000 Ω and a voltage measuring range from 0 to 600 V AC, including the detection of DC voltage presence.

A critical safety feature in all these models is the automatic activation of the AC voltage range as soon as the device is connected to a circuit. This ensures that users are warned if the circuit is live before operation begins. Moreover, following tests on capacitive equipment, such as cables, the testers provide an indication of the voltage level to confirm it is safe to remove the test leads.

MEGGER MJ159-MJ359 and 210170 Major Megger Insulation Testers Specifications

  • Max output voltage (DC):1000 V
  • Max resistance reading:2000 MΩ
  • Resistance measuring range:0.1 Ω – 2000 MΩ
  • No scale multipliers
  • Multiple test voltages for spot and step voltage testing
  • Guard terminal to eliminate surface leakage current
1 review

1 review for MEGGER MJ159-MJ359 and 210170 Major Megger Insulation Testers

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  1. Ryder

    Perfect tool

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Megger since 1889 is a leading global premium manufacturer of measurement and testing technology. Megger top priority has always been to make your everyday work easier and safer. As such, insulation testers, micro-ohmmeters, and multimeters are among the long line of Megger inventions, making this brand one of the pioneers in the electrical industry. Megger products combine many years of experience and the valued feedback from our global users with the inventiveness and conscientiousness of our product developers. In Germany, we manufacture at three sites, Aachen, and Baunach near Bamberg and Radeburg near Dresden. Other manufacturing locations are based in Sweden, England, and America.







Technical Specifications

Specification MJ159                  MJ359 210170
Insulation Resistance 0 to 2,000 MΩ 0 to 20,000 MΩ
Accuracy ±1.25% of fsd on a 2.8 in. (71.1mm) arc length ±3% of scale length on a 3.08 inch arc length
Nominal Test Voltages                                                           DC: 100 V, 250 V, 500 V, 1000 V
Applied test voltage accuracy (250 V, 500 V, 1000 V ranges) +30%, -0% max. +5%, -5% max.
Applied test voltage accuracy (100 V range) +40%, -0% max. +5%, -5% max.
Midscale resistance 4 MΩ 40 MΩ
Short Circuit Current 1.9 mA 220 μA nominal on all ranges
Maximum Load Capacitance                                                 1μF with less than ±0.1” pointer movement
Discharge rate Up to 1 μF capacitance is discharged from 1000 V to less than 42.4 V in less than 4 secs
Automatic discharge Capacitive circuits are automatically discharged when the “TEST” button is released following an insulation test.
Low Resistance Range                                                          0.1 Ω – 5000 Ω
Test Voltage (open circuit) 3 V ±0.2 V 3 V ±5%
Scale length                                                          3.08 in. (78 mm)
Short circuit current 2 mA ±10% 30 mA ±10%
Safety Voltage Measurement 20 V to 600 V AC; the meter is RMS calibrated and average responding
Safety voltage indicator Indicates the presence of DC voltages. Scaling is not the same as the AC meter. True DC voltage equals scale reading divided by 2.22
Physical Characteristics Dimensions 8.25 H x 5 W x 5 D in. (213 H x 124 W x 128 D mm); Weight Approximately 1 kg (2,3lb)