Patent
Switchless D.C. multifunction tester
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TLDR
A self-contained hand-held portable pocket probe for troubleshooting direct current electrical systems is described in this paper, which includes an electrically conductive probe, a ground terminal, and first and second electrical circuits connected in parallel between the probe and ground terminal.Abstract:
A self-contained hand-held portable pocket probe for trouble shooting direct current electrical systems. The probe includes an electrically conductive probe, a ground terminal, and first and second electrical circuits connected in parallel between the probe and ground terminal. The first electrical circuit includes an illumination device, a rectifying device, and a device for limiting current flow through the illumination device. The first electrical circuit normally enables positive current flow only in the direction from the probe to the ground terminal. The second electrical circuit normally allows current flow in a direction from the ground terminal to the probe and includes an illumination device, a rectifying device and a battery. The probe is designed for use with direct current systems having maximum test voltages in the range of 6-24 volts and for measurement of low impedance grounds.read more
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References
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Patent
Electrical continuity and voltage testing device
TL;DR: A circuit testing device comprises multiple probes at least one of which is sized for insertion into a single electrical socket receptacle, and two of which are applicable to spaced conductive elements to test for electrical continuity there between externally of said device.
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TL;DR: A personal electrostatic safety monitor comprising an electronic circuit which continuously monitors electrostatic energy transfer and similar forms of electrical energy transfer for the purpose of human safety is described in this paper.
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Portable electric capacitor tester using an LED indicator
TL;DR: A portable electric tester energized by a self-contained battery including switch means and a Light Emitting Diode (LED) device for testing capacitors upon visual interpretation of the luminosity of the light emitting diode is described in this paper.
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Current monitor circuits
TL;DR: In this article, a visual indicator in parallel with a zener diode, positioned in series with a load, is provided to monitor the presence of current flow in a circuit over a range of several orders of magnitude.