Instrument used for the live troubleshooting of short circuits
First Claim
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1. An apparatus for detecting a short circuit condition in television horizontal deflection circuits, wherein the apparatus comprises:
- leads electrically connected to a television horizontal deflection circuit for receiving a test current from said television horizontal deflection circuit at a time during which said television horizontal deflection circuit is live;
diode circuitry having a plurality of diodes and connected to said leads, for directing said test current from said television horizontal deflection circuit through an ammeter in a predetermined direction regardless of the orientation of the polarity of the leads;
an active circuit having a plurality of electrically conductive active elements connected in series with said ammeter for controlling said test current so that the controlled test current is maintained at a safe level to prevent damage to said apparatus and said television horizontal deflection circuit;
and an indicating means connected in parallel with said ammeter and said active circuit for visually indicating the presence of a short circuit condition.
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Abstract
An instrument used for the live troubleshooting of short circuits in electronic equipment. This instrument has a current indicator, an adjustment to set the maximum current and electrical connectors. The short circuited line on the equipment to be repaired is opened and the connectors are connected, in order to complete the circuit. The instrument is adjusted to deliver a maximum current which is safe for the equipment when the equipment is functioning normally. The technician will now be able to troubleshoot the live circuit without causing further damage.
19 Citations
1 Claim
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1. An apparatus for detecting a short circuit condition in television horizontal deflection circuits, wherein the apparatus comprises:
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leads electrically connected to a television horizontal deflection circuit for receiving a test current from said television horizontal deflection circuit at a time during which said television horizontal deflection circuit is live; diode circuitry having a plurality of diodes and connected to said leads, for directing said test current from said television horizontal deflection circuit through an ammeter in a predetermined direction regardless of the orientation of the polarity of the leads; an active circuit having a plurality of electrically conductive active elements connected in series with said ammeter for controlling said test current so that the controlled test current is maintained at a safe level to prevent damage to said apparatus and said television horizontal deflection circuit; and an indicating means connected in parallel with said ammeter and said active circuit for visually indicating the presence of a short circuit condition.
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Specification
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Current AssigneeLeon St Aubyn Rapaport
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Original AssigneeLeon St Aubyn Rapaport
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InventorsRapaport, Leon St Aubyn
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Primary Examiner(s)BROWN, GLENN WARNER
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Application NumberUS08/588,050Time in Patent Office701 DaysField of Search324/500, 324/511, 324/537, 324/555, 324/556, 340/650, 361/58, 361/93, 361/115US Class Current324/555CPC Class CodesG01R 31/2825 in household appliances or ...G01R 31/2841 Signal generatorsG01R 31/52 Testing for short-circuits,...H04N 17/04 for receivers
