Summary
International Symposium on Electromagnetic Compatibility
2009
Session Number:24S1
Session:
Number:24S1-3
Derivation of Spark Transients from Finger Touch
Y. Taka,
pp.773-776
Publication Date:2009/7/20
Online ISSN:2188-5079
Summary:
Electrostatic discharges (ESDs) through finger touch from a charged human with low charge voltages below 1000 V cause a fatal EM malfunction in high-tech information equipment.In this study, using the measured results described above and an equivalent circuit we previously proposed for the discharge currents, we derived the corresponding discharge voltages, measurement of which is basically impossible, and examined the effect of the aluminum foil size on discharges through a fingertip in conjunction with the discharge currents and voltages. As a result, we found that the hand-held metal bar and aluminum foil attachment produce a one-shot discharge current with steeply rising time shorter than a hundred picoseconds and the corresponding discharge voltage abruptly changing from the charge voltage to certain remaining voltages due to other types of discharges like glows or arcs following sparks, and the peaks of discharge currents through a fingertip increase with the attachment foil size.