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Test Plug

IP.com Disclosure Number: IPCOM000096339D
Original Publication Date: 1963-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Mandra, RR: AUTHOR

Abstract

In servicing and testing DC circuits it is often desirable to determine polarity as well as continuity. In most instances the polarity of the circuit is established and is known to the serviceman. If, due to an alteration or break-down, the leads to the test jack are changed, this plug is useful to indicate the change in polarity.

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Test Plug

In servicing and testing DC circuits it is often desirable to determine polarity as well as continuity. In most instances the polarity of the circuit is established and is known to the serviceman. If, due to an alteration or break-down, the leads to the test jack are changed, this plug is useful to indicate the change in polarity.

In a neon lamp, one of the two electrodes glows when connected to the negative side of a DC circuit. This test plug is based on such characteristic. The plug has a neon lamp 10 encased in a cylindrical handle 11 of insulating material and a tip 12 and sleeve 14 to which the leads of the lamp are connected.

A mark 16 placed on the side of the handle in alignment with the negative electrode 15 glows to indicate negative when the plug is inserted in a test jack. It does not glow to indicate positive. A leveling resistance 17 contained in the handle is connected in series with the lamp.

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