Summary
International Symposium on Electromagnetic Compatibility
2014
Session Number:16A2-B
Session:
Number:16A2-B3
Statistical Measurement of Burst Discharge Currents through Fingertip from Charged Human
Yoshihisa Kagawa, Ikuko Mori, Yoshinori Taka, Osamu Fujiwara,
pp.-
Publication Date:2014/05/12
Online ISSN:2188-5079
Summary:
To understand the characteristics of human electrostatic discharges (ESDs), using a 12-GHz digital oscilloscope, we measured discharge currents injected into an IEC (International Electrotechnical Commission) current calibration target through the fingertip from a human body charged at a voltage of 300 V. Occurrence frequencies of the current waveforms and their cumulative relative frequency distributions were investigated. As a result, we confirmed that the finger touch causes burst discharges having current peaks of 60-ps rise time but a few ten milli-amperes, while the hand-held metal produces a one-shot discharge of the current peak with five-to-six amperes and 45-ps rise time. It was also found that the fingertip provides discharge peak currents that vary according to a log-normal distribution, while the hand-held metal bar gives current peaks following a normal distribution.