CN2048591U

CN2048591U - Contactless electric tester

Info

Publication number: CN2048591U
Application number: CN 89204792
Authority: CN
Inventors: 郭静峰
Original assignee: 郭静蜂
Priority date: 1989-04-25
Filing date: 1989-04-25
Publication date: 1989-11-29

Abstract

The utility model provides a non-contact type induction electroscope. The non-contact type induction electroscope mainly comprises six phase reversers, a multivibrator circuit, and a light emitting diode display circuit which is controlled by a triode. The high input impedance of one of phase reversers is used for inducting the weak alternating signal of an external electrical field, and then, the weak alternating signal is enlarged and shaped to control the multivibrator circuit and the triode. When a measured object is electrified, the multivibrator circuit starts to oscillate to drive a buzzing sheet to sound. The triode is led through to make a diode which is connected with the collector of the triode send light, and the simultaneous sound-light display is used for judging whether the measured object is electrified or not.

Description

Contactless electric tester

The utility model relates to a kind of device of contactless check electric signal.

Existing electroscope mainly is a test pencil, and whether test pencil is metal end to be touched testee and by forming the loop between human body and the ground, utilize the demonstration inspected object of neon bulb charged.The disadvantage of this test pencil is to contact with object, can't search hidden electrified body, also has the danger that electric shock is hurted sb.'s feelings when surveying high pressure.

The purpose of this utility model is that a kind of electroscope that need not contact testee will be provided.

Based on above-mentioned purpose, the oncontacting electroscope that the utility model relates to is a kind of induction type electroscope, utilize the faint alternating signal of the induction end induction external electrical field of a high input impedance, then this induced signal is amplified and shaping, thereafter remove to control a multivibrator, whether starting of oscillation judges whether testee is charged from oscillator.Electroscope of the present utility model realizes simultaneously that by piezo and light emitting diode acousto-optic shows.Use this electroscope, need not touch anything, just can judge whether supply line switches on, distinguish live wire and center line and search the circuit breakpoint.

Below in conjunction with embodiment and accompanying drawing thereof the utility model is done specific descriptions.

The galvanoscopic circuit diagram of oncontacting that Fig. 1 the utility model proposes for basis.

Symbol among the figure: G ₁-G ₆Represent six identical phase inverters, R ₁-R ₇Expression resistance, C ₁And C ₂Expression electric capacity, D ₁-D ₃The expression diode, BG represents transistor, and Y represents piezo, and K represents switch, and E is power supply (3V).Phase inverter G ₁Input end make induction end, it has very high input impedance, G ₂With G ₁The induced signal shaping of the amplification of output is also exported 50 hertz square-wave signal, G ₅And G ₆And R ₅, R ₆And C ₂Constitute multivibrator, G ₃And G ₄Play inverting function and control above-mentioned multivibrator and triode BG respectively, at last by hummer Y and light emitting diode D ₂Indicate charged situation.

This galvanoscopic course of work is such, closed power switch K, D ₃Luminous expression electroscope power connection.If measured object is charged, induced signal input G is arranged then when induction end is close ₁, through G ₁Output signal after the amplification is higher than G ₂Threshold voltage (1.5V), G ₂Output terminal be low level, through G ₃Become high level after anti-phase and make D ₁End, the input end of multivibrator is a high level, so the oscillator starting of oscillation, hummer Y sounding, G ₄The anti-phase triode BG base stage of exporting to makes BG conducting, D ₂Luminous.If measured object is not charged, then the duty of above-mentioned each element just in time turns (anti-phase), D ₂All reactionless with Y.Regulate R ₄And R ₅Can change the volume of this galvanoscopic sensitivity and piezo Y.

Six phase inverters among Fig. 1 can be with the phase inverter (not gate) of six separation, and an also available integrated package replaces, and the element that dotted line comprised can be with an integrated circuit CD4069 realization, and digital 1-14 represents the subscript of this integrated package respectively.

Claims

1, a kind of oncontacting electroscope is characterized in that comprising six identical phase inverter G ₁-G ₆, resistance R ₁-R ₇, capacitor C ₁And C ₂, diode D ₁-D ₃, triode BG and piezo Y, R1-R ₄And capacitor C ₁Form phase inverter G ₁Input impedance, G ₁Output terminal and G ₂Input end link to each other: G ₂Output terminal and G ₃And G ₄Input end link to each other G ₃Output terminal by diode D ₁With G ₅Input end link to each other G ₅Output terminal and G ₆Input end link to each other G ₄Input end connect the base stage of triode BG, D ₂Be connected on the collector of BG R ₅, R ₆And C ₂Connect G respectively ₅Input end and G ₆Two ends form multi-resonant oscillating circuit, piezo Y is connected on G ₆Output terminal and power cathode between, R ₇And D ₁Be connected between the power positive cathode after the series connection.