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MEGABRAS MD-542 User Manual

Insulation tester
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GU-1220RA

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Summary of Contents for MEGABRAS MD-542

  • Page 1 GU-1220RA...
  • Page 2 MD-542 500 V digital insulation tester GU-1306 © 2008 MEGABRAS. All rights reserved. Printed in Brazil...

  • Page 3: Safety Warnings

    Safety warnings Before to use this instrument the User’s guide and • Safety warnings must be read and understood. • Safety procedures and rules for working near high voltage energized systems must be observed during the use of this equipment. The generated voltages may be dangerous.

  • Page 4: Used Symbols

    Used Symbols Caution, risk of electric shock. Caution, refer to User Guide. AC or DC Equipment complies with current EU Directives. Earth Timer Sound alarm (beep) On / Off Battery...

  • Page 6: Table Of Contents

    Content Safety warnings ............4 Used Symbols ..............5 Description ...............8 Connectors and controls ..........9 Key functions ..............10 Leds ................11 Power supply ..............11 Charging the battery ............12 Low battery indication ............13 Connecting the equipment ..........13 Setting the equipment ............15 Test voltage ..............15 Timer ................15 Limit ................16 Making measurements ...........17...

  • Page 7: Description

    Description The MD-542 is an easy-to-use equipment. It uses an efficient well experienced technology, which provides reliable, safe and accurate measurements of insulation resistances up to 20,000 MΩ @ 500 V, with 3 test voltages: 100 V - 250 V - 500 V.

  • Page 8: Connectors And Controls

    Connectors and controls Terminals 3 ½ digits display Panel Power supply input...

  • Page 9: Key Functions

    Key functions On / Off V Test - it allows to program the test voltage Timer - it allows to program the test duration LIM - it allows to program the limit of the “Pass- Fail test” These keys (decrease or increase) allowing the selection of the value that is being programmed TEST - start / stop the test Hold - press to freeze the displayed value.

  • Page 10: Leds

    Indicates the unit of measured value showed in the display. Indicate the selected test voltage Indicate that the Battery charger is in operation Power supply The MD-542 uses rechargeable NiMH batteries for power supply.

  • Page 11: Charging The Battery

    Charging the battery To recharge the battery: Check if the MD-542 is turned OFF. • Connect the equipment to the mains using the external • power supply. The battery led will keep on lightning with a red light up to completing the charge. At that point, it will change to a green light, being like this up to the equipment disconnection from the mains supply.

  • Page 12: Low Battery Indication

    Low battery indication When the battery charge reach a minimum value, approximately 10%, the message “LO BAT” appears automatically in the display. Connecting the equipment Connect the MD-542 as follow: To measure: Low resistances To measure: Insulation resistances To measure:...
  • Page 13 Connect the test leads to the circuit and turn ON ( the equipment.

  • Page 14: Setting The Equipment

    Setting the equipment Test voltage To select the test voltage: 1- Press the key 2- Press the key , the selected test voltage will be indicated by the leds 3- After 5 seconds without pressing the keys the equipment turn into safety mode. In this mode, the operator cannot change the selected test voltage unless he presses the key again.

  • Page 15: Limit

    Limit Programming the lower insulation limit to perform a “Pass-fail test”: 1- Press the key 2- Press the key to select the limit. The possible values are: 0.2 - 0.3 - 0.4 - 0.5 - 0.6 - 0.7 - 0.8 - 0.9 MΩ 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 MΩ...

  • Page 16: Making Measurements

    Voltmeter True - RMS This instrument measure voltages from 0 up to 400 V. 1- Connect the test leads to the circuit. 2- Turn ON the MD-542 by pressing the key , the equipment starts on voltmeter function. If the MD-542...
  • Page 17 10,000 MΩ up to 10,000 MΩ up to 20,000 MΩ 7- The MD-542 has a built-in chronometer. To see the elapsed time since test voltage is applied, press the 8- To stop the test, press the key . The led...

  • Page 18: Low Resistance / Continuity

    4- Connect the test leads to the circuit to be measured. The display will show the resistance value. If the MD-542 detect a short-circuit or the reading is R < 5 ± 0.5 Ω, the equipment will indicate with a BEEP...

  • Page 19: Auto-Power-Off

    Auto-power-off The MD-542 automatically turns off after 5 minutes of non-use. In measurements with programmed time, the countdown of 5 minutes starts after the test conclusion. To turn the equipment back on, press the key Cleaning Cleaning of this instrument should be carried out using a soft cleaning liquid, after verifying that it doesn’t affect the...

  • Page 20: Technical Specifications

    Technical specifications Nominal test voltages : 100 V - 250 V - 500 V Negative, DC voltage Resistance : 10 kΩ up to 20,000 MΩ @ measurement range 500 V 10 kΩ up to 10,000 MΩ @ 100 V and 250 V Short circuit current : 1.5 ±...
  • Page 21 : 0.2 - 0.3 - 0.4 - 0.5 - 0.6 - 0.7 Pass / fail test - 0.8 - 0.9 MΩ 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 20 - 30 - 40 - 50 - 60 - 70 - 80 - 90 - 100 - 200 - 300 - 400 - 500 - 600 - 700 - 800 - 900 MΩ...
  • Page 22 Power supply : Built-in, NiMH battery Autonomy: 1000 tests of 5 seconds with an interval of 25 seconds according IEC 61557-2. During the measurement is used a test resistance which the value is UN x (1000 Ω / V). Battery charger : Built-in, with external power supply of 9 V - 0.5 A Operation temperature : -5°C to 50°C...

  • Page 23: Warranty

    MEGABRAS. The manufacturer assumes no risk for damage in transit. MEGABRAS will, at its option, repair or replace the defective equipment free of charge or refund your purchase price. However, if...
  • Page 24 Notes...
  • Page 25 MEGABRAS INDÚSTRIA ELETRÔNICA LTDA. Rua Gibraltar 172 - Santo Amaro Zip Code 04755-070 - São Paulo - SP - Brazil Phone: +55 11 5641-8111 Fax: +55 11 5641-9755 www.megabras.com...

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