Hand-held non-contacting electric field detection tool

Details Hand-held non-contacting electric field detection tool Hand-held non-contacting electric field detection tool

1992-08-27

1994-11-08

Strecker, Gerard R.

Electricity: measuring and testing

Internal-combustion engine ignition system or device

In situ testing of spark plug

324133, 324 725, F23Q 2310, G01M 1500, F02P 1700, G01R 1914

Patent

active

053630459

ABSTRACT:
A portable hand held diagnostic tool which non-invasively detects an electric field when placed adjacent a component of a spark plug firing portion of an ignition system and provides a positive indication of the detected electric field. A printed circuit board containing a control circuit, a replaceable battery supply, an ON/OFF switch, an indicator such as an LED, and a pickup antenna, is slidably mounted within the hollow interior of a dielectric tubular case. The antenna is located adjacent a pickup end of the case and detects the electric field generated by an ignition system during firing of a spark plug which actuates the LED in response to the detected firing. The dielectric case is free of external metal parts adjacent the pickup end to help minimize arcing. A battery test circuit may be incorporated into the control circuitry to ensure an adequate power supply for operation of the control circuitry. A fixed or variable resistor enables the sensitivity of the firing pickup to be selected.

REFERENCES:
patent: 3369175 (1968-02-01), Morris
patent: 4006409 (1977-02-01), Adams
patent: 4296376 (1981-10-01), Bartol, Jr.
patent: 5103165 (1992-04-01), Sirattz
Product Bulletin Firing Indicators-Spark Plug Service Tools-Hand Tool Industries, Inc., Kent, Ohio, Jun. 1985.

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