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Insulation Resistance Tester

BM5200

 
  • BM5200
  • Overview  
  • Application  
  • Downloads  
Overview
  • 1 T Ω, 1.4 mA, 5 kV digital insulation tester with digital and analogue display
  • Five test ranges; 250 V, 500 V, 1000 V, 2500 V and 5000 V
  • Insulation (InS), Polarization Index (PI) and variable timed test (t) modes
  • Selectable DC or AC (including frequency) voltmeter functions
  • Guard terminal to shunt surface leakage currents
  • CATIII 600 V safety rating

Megger BM5200 is a battery powered insulation tester with digital and analogue arc display, designed for high voltage insulation resistance testing in the maintenance and servicing of cables, rotating plant machinery, transformers, switchgear and industrial applications.

DC insulation tests are performed at 250 V, 500 V, 1000 V, 2500 V, 5000 V. Insulation resistance measuring range is 100 k Ω to 1000 G Ω. Automatic discharge for capacitive circuits under test is provided and decaying voltage displayed.

The guard terminal can be used to minimize the effects of surface leakage and hence erroneous measurements when carrying out insulation resistance tests.

Application

Electrical insulating materials deteriorate with time leading to breakdowns and costly repair bills. Insulation resistance testers apply a regulated DC voltage across the insulation and measure current flow through it applying Ohm’s law to calculate insulation resistance. The current flows because no insulation material is perfect.

IR tester uses include:

  • Product test and qualification
  • Installation of equipment
  • Routine maintenance
  • Problem resolutions

Insulation testing with high voltage DC affects insulation polarisation such that consecutive testing without complete discharge of the unit under test will yield different results.

Care should be taken to always employ the same process and technique of connecting to and testing an insulator to be able to trend results. It is important to record temperature of the insulation as well as IR values.

Downloads