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Megger 212459
MJ459 Major Megger Battery Powered Insulation Resistance Tester
100, 250, 500 & 1000 V; 2 GOhms
Discontinued

  • No scale multipliers
  • Multiple test voltages for spot and step voltage testing
  • Guard terminal to eliminate surface leakage current
  • Six IEC LR6 cells (AA) Battery life: not less than 1300 insulation or Resistance range tests
  • Available in alternate configurations:
    • 212159 - Low voltage brushless a.c. generator. Cranking speed between 130 rpm and 170 rpm
    • 212359 - Dual operation low voltage brushless a.c. generator or 120 V 50/60 Hz mains (line) supply
    • 212559 - Dual operation 120 V 50/60 Hz mains (line) supply and rechargeable battery. Six NiMh 1800 mAh cells
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Megger 212459 Shown
Product Information
Datasheet 234 KB PDF
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Quality is crafted into Megger 212459 MJ459 Major Megger Battery Powered 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 212459 MJ459 Major Megger Battery Powered 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 MJ459 is provided by 6 replaceable “AA” alkaline cells.

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 212459 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.

Specifications
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
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
General
Power Supply Six IEC LR6 cells (AA) Battery life:
not less than 1300 insulation or Resistance range tests
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
Ordering Information
Model Description Buy Online Price
MJ459
MFR ID: 212459
Megger 212459 MJ459 Battery Analog Major Megger Insulation Tester; 100, 250, 500 & 1000 V; 2 GOhms Discontinued
Optional Configurations
MJ159
MFR ID: 212159
Megger 212159 MJ159 Hand-Crank Analog Major Megger Insulation Tester; 100, 250, 500 & 1000 V; 2 GOhms Buy Now See Price In Cart
$1,165.00
MJ359
MFR ID: 212359
Megger 212359, MJ359 Hand-Crank/Line Analog Major Megger Insulation Tester; 100, 250, 500 & 1000 V; 2 GOhms Buy Now See Price In Cart
$1,285.00
MJ559
MFR ID: 212559
Megger 212559 MJ559 Battery/Line Analog Major Megger Insulation Tester; 100, 250, 500 & 1000 V; 2 GOhms Discontinued
Included Accessories
 
  • 1 - User Guide
  • 1 - Test lead set (3 leads, 3 prods, 3 clips)
  • 5 - Test record card
  • 1 - Carrying case
Included