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MD-542

500V INSULATION TESTER
  •  Microprocessor controlled
  • Insulation test up to 100 GΩ @ 500 V
  • Test voltages: 100 V - 250 V - 500 V
  • Short circuit current: 1.5 ± 0.3 mA
  • Guard terminal
  • Auto-range
  • Programmable timer
  • Pass-fail test
  • Low resistance and Continuity measurement
  • AC/DC Voltmeter up to 400 V - True RMS
  • Rechargeable battery
 MD-542
The Megabras MD‑542 is a smart, microprocessor-controlled, 500 V insulation tester for up to 100 GΩ @ 500 V resistance measuring with 100 V, 250 V and 500 V test voltage. It is a portable, hand-held, battery-powered equipment. 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.

Operation is very simple and user-friendly: just connect the leads, switch-on the equipment, select the test voltage and press the start button. Then the equipment automatically selects the most suitable scale and shows the measured value in the digital display.

In order to guarantee the operator safety there are no accessible metallic parts. 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.

Furthermore, it offers useful additional features: 200 mA continuity range, low resistance measurement, AC/DC voltage measurement up to 400 V, selectable timer, hold memory, and selectable resistance limits for pass-fail testing, with acoustic indication.

Surface leakage paths may affect the measurement of high value insulation resistance. The use of the GUARD terminal permits to remove the effect of this current, substantially improving the test result.