Trouble finder for testing an electrical system of a vehicle for short-circuiting
First Claim
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1. A trouble finder for testing an electrical system, comprising:
- a transformer having an input adapted to be coupled to a power source;
a rectifier, coupled to an output of said transformer;
an oscillator unit coupled so as to receive power from said rectifier;
a regulator coupled to said rectifier so as to receive power therefrom;
means for coupling an output of said oscillator to an input of said regulator;
first and second output terminals for connection to said electrical system to be tested;
an ammeter coupling said voltage regulator to said first output terminal;
a voltmeter coupling said first and second output terminals;
a protection unit coupled to said regulator;
a sensitivity unit, connected to said first and second output terminals and arranged to enable sensing of a voltage across said output terminals, the output voltage deviating from zero upon connection of said trouble finder to an electrical system being tested;
a potentiometer, coupled to said sensitivity unit, for balancing the sensed voltage to zero level; and
wherein said oscillator unit is intended for limiting the output current of the regulator unit at an occurrence of a short-circuit in the electrical system, said oscillator unit being activated by a balanced 0-zero voltage level detected by the sensitivity unit.
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Abstract
A device for tracing preferably short-circuiting in electric systems.
When tracing short-circuiting it is desirable that voltage and current will have normal values immediately after elimination thereof, for instance by contact. This object has been achieved in that an oscillator (23) limits the current at the output (19) to near 0 A as long as short-circuiting remains.
When the short-circuiting ceases this is detected by a unit of sensitivity (24) and, as a result of this, the oscillation stops and preset current and voltage levels are entered immediately and automatically.
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Citations
12 Claims
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1. A trouble finder for testing an electrical system, comprising:
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a transformer having an input adapted to be coupled to a power source; a rectifier, coupled to an output of said transformer; an oscillator unit coupled so as to receive power from said rectifier; a regulator coupled to said rectifier so as to receive power therefrom; means for coupling an output of said oscillator to an input of said regulator; first and second output terminals for connection to said electrical system to be tested; an ammeter coupling said voltage regulator to said first output terminal; a voltmeter coupling said first and second output terminals; a protection unit coupled to said regulator; a sensitivity unit, connected to said first and second output terminals and arranged to enable sensing of a voltage across said output terminals, the output voltage deviating from zero upon connection of said trouble finder to an electrical system being tested; a potentiometer, coupled to said sensitivity unit, for balancing the sensed voltage to zero level; and wherein said oscillator unit is intended for limiting the output current of the regulator unit at an occurrence of a short-circuit in the electrical system, said oscillator unit being activated by a balanced 0-zero voltage level detected by the sensitivity unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification
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Current AssigneePeter Persson
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Original AssigneePeter Persson
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InventorsPersson, Peter
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Primary Examiner(s)Eisenzopf, Reinhard J.
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Assistant Examiner(s)NOT, DEFINED
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Application NumberUS07/235,883Time in Patent Office446 DaysField of Search324/500, 324/503, 324/504, 324/539, 324/542, 324/512, 324/523US Class Current324/503CPC Class CodesB60Q 11/00 Arrangement of monitoring d...G01R 31/006 on road vehicles, e.g. auto...G01R 31/52 Testing for short-circuits,...
