Principle


Dielectric Strength, also known as Break Down Voltage, testing is used to measure the electrical strength of a material as an insulator. Dielectric strength is defined as the maximum voltage required to produce a dielectric breakdown through the material and is expressed as Volts per unit thickness. A higher dielectric strength represents a better quality of insulator.

Dielectric strength is calculated by dividing the breakdown voltage by the thickness of the sample. The data is expressed in Volts/mil. The location of the failure is also recorded.



Capabilities


AC and DC

  • ASTM D149 (AC voltage)
  • ASTM D3755 (DC voltage)
  • 4" square sample or larger (thicker samples are tested in oil bath to avoid corona arcing)
  • Testing temperatures (lab ambient)


Equipment



Equipment Type

Information

           

Hipotronics Model D149-DI
  • Testing up to 100KV
  • Open air or oil bath electrodes
  • AC and DC voltage testing
  • Three methods
    • Short time
    • Slow rate-of-rise
    • Step-by-step

   

  • Typical oil bath fixture
  • Typical open air fixture
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