Testing process for the quality control of electromagnetically actuated switching devices

A testing process for quality control of an electromagnetically actuated switched device in which current contacts are made when an armature is actuated and in which, when properly functioning, the armature comes to rest during a time range, the process comprising steps of:

• a) actuating the armature to close the switching device;
• b) detecting a sound emitted by the switching device when the armature is actuated;
• c) transmitting the sound detected in step (b) to an evaluation device;
• d) discriminating individual components of the sound detected in step (b) based on at least one of a time curve of the individual components of the sound and frequency curve of the individual components of the sound;
• e) analyzing the sound transmitted in step (c) in the time range;
• and
• f) classifying the analyzed sound detected within the time range as at least one of a plurality of faults.

A testing process for the quality control of electromagnetically actuated switching devices in which current contacts are made by actuating an armature, the process comprising steps of:

• a) actuating the armature to close the switching device;
• b) detecting sound emitted by the switching device when the armature is actuated;
• c) transmitting the sound detected in step (b) to an evaluation device;
• d) discriminating individual components of the sound based on at least one of a time curve of the individual components of the sound and frequency curve of the individual components of the sound;
• e) separating sound signals which are generated when the contact is made and generated when the armature strikes a magnetic core from sound signals caused by a post-switching oscillation of components;
• and
• f) objectively determining whether the switching device has a proper sound based on the separated sound signals.