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SMART MEGOHMMETER |
The Megabras MD-5060e is a smart, microprocessor-controlled, 5 kV insulation tester. Besides the conventional measurement of insulation resistances up to 5 TΩ, its advanced features allow to automatically measure both the Polarization Index and Dielectric Absorption Index, thus significantly simplifying testing of transformers.
This insulation resistance tester is a portable, battery-powered equipment. Test voltage may be chosen from 500 V to 5 kV in 500 V steps. Due to its measurement principle (actual voltage and current readings) it is a "true megohmmeter" and so the accuracy of resistance measurement is not affected by any test voltage error. Nevertheless, the High-Voltage generator is electronically stabililized with a better than 2% accuracy in open-circuit condition and for any normal operation battery voltage.
The built-in chronometer automatically counts the elapsed time since the start of measurement. Measured values are transmitted through the serial output (RS-232) and may be logged using a Lap-Top, PDA, or any data-logger for their later analysis. Optionally, the MD-5060e megohmmeter may be supplied with a built-in printer that prints values as a registration of the performed test.
Operation is very simple and user-friendly: just connect the leads, switch-on the equipment, select the test voltage and press the start button. At that moment, high voltage is applied to the sample and the chronometer starts counting the time that goes by. Then the equipment automatically selects the most suitable scale and shows the measured value in the alphanumerical display. Reading is direct, both in digital and analogue form (bar-graph).
In order to guarantee the operator safety, the cabinet is made of a high-breakdown strength plastic and there are no accessible metallic parts. High security output terminals are placed in the furthest and most protected area of the equipment. A light indicator shows high-voltage presence and is switched-off when the capacities (both internal and external) are discharged up to reaching a safe value.
MD-5060e is powered using a rechargeable battery and has an automatic charger that may be connected to 110 V or 220 V mains supply.
The cabinet is strong and lightweight, easy to carry, impact-resistant and suitable to be used under severe weather conditions. Thus the megohmmeter supplies very reliable and accurate measurements both in laboratory and out in the field.