Patent ID: 9654890
Date: 2017-05-16
CPC Classifications: H04R

Claim:
1. A method for testing an apparatus which comprises a set of operational subunits, each of the operational subunits comprising a moving element, wherein each of the moving elements moves between respective first and second extreme positions, the method comprising: transferring to the apparatus stabilization control commands by an electrical driver electrically coupled to the apparatus, thereby resulting in maintaining in a static position a moving element of each out of a subset of electrically driven operational subunits out of the set of operational subunits; transferring to the apparatus, by said electrical driver, first latching-commands for latching to the first extreme position a candidate moving element which is a moving element of a candidate operational subunit out of the subset of operational subunits; when the first latching control commands are in effect, measuring a first output frequency of an oscillator whose output is coupled to the candidate operational subunit in an electrical coupling setup which causes the output frequency of the oscillator to depend on positions of a plurality of moving elements which comprises the candidate moving element; based on the first output frequency determining, by a processor, a state of the candidate operational subunit; and wherein the determining of the state comprises determining a presence of a defect in the candidate operational subunit by said processor.