Product Overview: Megger MJ359 1000 V Insulation Tester
Quality is crafted into the Megger MJ359 (212359) Insulation Resistance Tester, which has excellent test voltage regulation, direct measurement readout and an external guard terminal to eliminate surface leakage current from the measurement. The MJ359 is a portable, self-contained instrument designed to give rapid and accurate measurements.
The MJ359 Insulation Resistance Tester features an analog display and has four selectable test voltages of 100, 250, 500 and 1000 VDC; measuring insulation resistance up to 2000 Megaohms; and a resistance range to 5000 ohms.
Power for the MJ359 is provided by a mains line (120VAC 50/60 Hz) or a 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 MJ359 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.
The MJ359 Insulation Resistance Tester 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. The tester is built into a strong ABS plastic case with a fold down carrying handle.
Megger MJ359 Features:
- Excellent test voltage regulation
- Direct measurement readout
- Portable
- Self-contained
- Fast and accurate measurements
- Analog display
- Low-voltage, hand cranked generator
- Strong ABS plastic case with a fold down carrying handle
- No scale multipliers
- Multiple test voltages
- Guard terminal to eliminate surface leakage current
• No scale multipliers
• Multiple test voltages for spot and step voltage testing
• Guard terminal to eliminate surface leakage current
The Megger MJ459 and MJ159 replace the BM12 and MJ10, respectively.
Four models are available for general purpose testing which include a low-voltage model.
All are 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 M-Ohms, 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 M-Ohms.
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