Voltage detectors and electrical continuity checkers
First Claim
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1. A combined voltage detector and electrical continuity checker comprising:
- a housing;
first, second and third light emitting diodes provided on said housing;
first, second and third terminals provided on said housing;
at least one external lead for connection to a terminal;
at least one D.C. bias source for said first and second light emitting diodes which are used primarily for voltage detection and polarity;
a D.C. supply for said third light emitting diode which is used primarily for continuity checking;
first circuit connection means for connecting said bias source and the first and second light emitting diodes in circuit between the first and second terminals; and
second circuit connection means for connecting said D.C. supply and the third light emitting diode in circuit between the second and third terminals;
said at least one D.C. bias source allowing the minimum voltage for conduction of the first and second light emitting diodes to be lowered.
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Abstract
A combined voltage detector and electrical continuity checker in the form of a pencil having a needle capable of piercing electrical insulation, a pair of light emitting diodes for determining the polarity of the voltage, a third light emitting diode and associated circuitry to perform a continuity check, a flexible cable and chip which can be plugged into the pencil to perform either one of the tests in conjunction with the needle, and biasing arrangements for the light emitting diodes in order to lower their threshold of conduction.
43 Citations
10 Claims
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1. A combined voltage detector and electrical continuity checker comprising:
- a housing;
first, second and third light emitting diodes provided on said housing;
first, second and third terminals provided on said housing;
at least one external lead for connection to a terminal;
at least one D.C. bias source for said first and second light emitting diodes which are used primarily for voltage detection and polarity;
a D.C. supply for said third light emitting diode which is used primarily for continuity checking;
first circuit connection means for connecting said bias source and the first and second light emitting diodes in circuit between the first and second terminals; and
second circuit connection means for connecting said D.C. supply and the third light emitting diode in circuit between the second and third terminals;
said at least one D.C. bias source allowing the minimum voltage for conduction of the first and second light emitting diodes to be lowered. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- a housing;
Specification