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Conductive Footwear Tester

IP.com Disclosure Number: IPCOM000061161D
Original Publication Date: 1986-May-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Parkin, DR: AUTHOR [+4]

Abstract

A conductive footwear tester consists of a small box which is connected by a coaxial cable to a floor plate. The floor plate is insulated from the ground by a 2 cm highly nonconductive material. The indicators on the box are three different colored LEDs which signify the three different ranges of the resistance of the footwear being worn. The different cutoff points for the ranges can be adjusted by R11 and R13 for different applications and conditions. The whole test system runs on a single 15 volt power supply for fixed site operation and 18 volts (four 9 volt batteries) for portable use. Only small adjustments of R11, R13 and R15 are required for the change in power source. The tester has a pressure switch on the upper unit to turn on when needed to conserve power.

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Conductive Footwear Tester

A conductive footwear tester consists of a small box which is connected by a coaxial cable to a floor plate. The floor plate is insulated from the ground by a 2 cm highly nonconductive material. The indicators on the box are three different colored LEDs which signify the three different ranges of the resistance of the footwear being worn. The different cutoff points for the ranges can be adjusted by R11 and R13 for different applications and conditions. The whole test system runs on a single 15 volt power supply for fixed site operation and 18 volts (four 9 volt batteries) for portable use. Only small adjustments of R11, R13 and R15 are required for the change in power source. The tester has a pressure switch on the upper unit to turn on when needed to conserve power. The tester is completely safe because the maximum current flowing through the person is 1 uA which is well below any safety requirements.

Conductive footwear is worn by personnel involved with computer components, explosives and other areas where static electricity could cause harm. This footwear coupled with a conductive flooring is an effective measure to prevent a static charge build-up. However, the footwear could become a safety hazard due to its very low resistance or the footwear could become useless if the resistance became too high.

In operation power to the tester circuit is provided by a 15 volt power supply. The 15 volts is divided into three different referenc...