Human body capacitance: static or dynamic concept? [ESD]

Niels M Jonassen

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Abstract

A standing human body insulated from ground by footwear and/or floor covering is in principle an insulated conductor and has, as such, a capacitance, i.e. the ability to store a charge and possibly discharge the stored energy in a spark discharge. In the human body, the human body capacitance (HBC) is traditionally chosen as 100 pF. However, a simple geometric model seems to suggest considerably higher values. A series of experiments, where the capacitance of standing persons were determined for various combinations of footwear and floor coverings, gave values in the order of 100-150 pF when the capacitance was determined by an AC-bridge measurement, but 200-400 pF when the traditional static charge-sharing method was used. Further experiments indicate that the two methods give the same result when the electric flux is well located in a dielectric other than air, but that the static method leads to higher values when a substantial part of the flux extends itself through badly defined stray fields. Since the concept of human body capacitance is normally used in a static (electric) context, it is suggested that the HBC be determined by a static method. No theoretical explanation of the observed differences is presently at hand
Original languageEnglish
Title of host publicationElectrical Overstress/Electrostatic Discharge Symposium Proceedings, 1998
PublisherIEEE
Publication date1998
Pages111-117
ISBN (Print)1-878303-91-0
DOIs
Publication statusPublished - 1998
EventElectrical Overstress/Electrostatic Discharge Symposium -
Duration: 1 Jan 1998 → …

Conference

ConferenceElectrical Overstress/Electrostatic Discharge Symposium
Period01/01/1998 → …

Bibliographical note

Copyright: 1998 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE

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