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Testing process for the quality control of electromagnetically actuated switching devices

  • US 5,629,864 A
  • Filed: 11/22/1994
  • Issued: 05/13/1997
  • Est. Priority Date: 05/22/1992
  • Status: Expired due to Fees
First Claim
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1. A testing process for the quality control of electromagnetically actuated switching devices in which current contacts are made by actuating an armature, the process including steps of:

  • a) actuating the armature of a switching device to close the switching device;

    b) detecting sound emitted by the switching device when its armature is actuated;

    c) transmitting the sound detected in step (b) to an evaluation device;

    d) discriminating sound signals caused by a making of the contact from sound signals caused by the armature striking a magnetic core by analyzing at least one of a time curve of individual components of the sound and a frequency curve of the individual components of the sound;

    e) evaluating only the sound signals caused by the armature striking the magnetic core.

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