Improved System for Measuring Contact Induced Harmonics

Portable wireless devices cannot avoid electrical contact due to assembly and maintenance requirements. In this paper, an improved test system is proposed for systematic investigation of harmonic distortion induced by metal to metal contacts. The system supports harmonic distortion measurements, DC resistance measurements, fine control of contact force or contraction and automatic re-mating for statistical purposes. In this regard, forward and reflected harmonic signals are measured and ultrasonic vibration is applied to cure contacts. A novel sample holder structure is designed and fabricated as a test vehicle for the measurements.