CN2126919Y

CN2126919Y - Ac.acoustooptic detecting instrument

Info

Publication number: CN2126919Y
Application number: CN 92225834
Authority: CN
Inventors: 王孚望
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-06-15
Filing date: 1992-06-15
Publication date: 1993-02-10
Anticipated expiration: 2002-06-15

Abstract

The utility model relates to an ac acoustic-optic detecting instrument which is mainly composed of a probe, an outer shell, switches, a luminous indicator, electronic elements in the outer shell, etc. The utility model utilizes grid electrodes of two field-effect tranisistors as the probe. The utility model adopts three groups of linkage four-bit selecting switches. Three detecting states can be selected. The indication is carried out in an acoustic-optic mode. The utility model has the characteristics of more functions, acoustic-optic display and little electric power consumption.

Description

ac.acoustooptic detecting instrument

The utility model relates to a kind of device that detects alternating current, particularly a kind of contactless hum photodetection instrument.

The tradition electricity measurer is direct contact type as test pencil, is replaced by noncontact electricity measurer technology gradually in recent years.

The probe of noncontact electricity measurer has the employing transistor base, as Chinese patent CN2050171U, also have and adopt field effect transistor, as Chinese patent CN2039429U, CN2037479U, Chinese patent CN2039429U is used to survey diode of the preceding string of grid contact of electric signal, is provided with the oscillatory circuit of transformer, triode composition in the circuit; It is measuring head, triode with the field effect transistor as signal amplifier, the light emitting diode contactless electricity measurer as display that Chinese patent CN2037479U discloses a kind of, is connected to resistance between the source electrode of its field effect transistor and the drain electrode.This electricity measurer circuit is simple, but function is insufficient, only has luminous demonstration, does not have the sounding indication.

The purpose of this utility model provides a kind of multiple test function that has, and can send different sound and light signals, hum photodetection instrument easy and simple to handle.

Embodiment of the present utility model is as follows:

External Design probe, shell, switch, luminous indication, direct supply, loudspeaker, electronic component and lead are housed in the shell, luminous indication has two, one is the light emitting diode D2 of display power supply situation, and another is that signal shows light emitting diode D1, and two field effect transistor BG1 and BG2 that are used to survey electric signal are arranged, be connected to resistance R 1 between the source electrode of BG2 and the drain electrode, triode BG3, the BG4, the BG5 that have also had switch and signal amplification, resistance R 2, R3, R6, capacitor C 1, C2;

Above-mentioned switch is four selector switch of three-group linkage;

Above-mentioned probe is a combined probe, and the drain electrode of BG1 and BG2 is joined, and grid is as the contact on the probe;

Above-mentioned BG4, BG5 are compound transistors, and the collector of BG3 and the base stage of BG4 are joined, and middle series connection variable resistor R5 also is connected to the branch road of being made up of resistance R 4 and socket ZD;

The emitter of above-mentioned BG4 and BG5 inserts the input end of an integrated package KD9561 respectively, the output termination loudspeaker of KD9561.

The utlity model has acousto-optic and show and multiple measurement function that power consumption is less.

Below in conjunction with embodiment and accompanying drawing structure of the present utility model is described in more detail.

Fig. 1 is an electrical schematic diagram of the present utility model, and Fig. 2 is an outside drawing of the present utility model.

As shown in Figure 2, the utility model has conical combined probe (1), shell (4), switch (3), luminous indication (2) and twin-core plug (5), electronic circuit board and lead are housed in the shell, its connecting relation as shown in Figure 1, wherein R5 is a variable resistor, be used to adjust detection sensitivity, C1 and C2 are filter capacitor, R6 is a current-limiting resistance, power supply adopts the 3V direct current, and light emitting diode D1 and D2 are as luminous indication (2), and wherein D1 shows detection signal, D2 display power supply break-make, principle of work of the present utility model is as follows:

The grid of field effect transistor BG1 is when the AC field, resistance between its drain electrode and the source electrode will increase, thereby BG3 is become by conducting to be ended, so BG4 and BG5 conducting, integrated circuit KD9561 gets, sound horn, when BG1 leaves AC field, triode BG3 conducting, BG4 and BG5 are ended, integrated package KD9561 outage, loudspeaker stop sounding, because BG1 sensitivity is very high, so can measure alternating current more at a distance, and BG2 and to be connected to resistance R 1 its sensitivity very low can only work just near lead the time, so can distinguish live wire and ground wire, when switch connect first grade, input end inserted resistance R 2, causes front end not worked, this moment twin-core plug (5) is inserted socket ZD and can carry out the continuity check of contact, noiseless when circuit is disconnected, during link tester, BG4, the BG5 conducting, integrated package KD9561 gets, sound horn, thereby can realize three kinds of test functions of the utility model by switch transition, under three kinds of states, make integrated package choosing sound send three kinds of different tone colors, as when checking circuit on-off, send blast of whistle, sound the alarm when checking fiery ground wire, and when surveying the voltage height of alternating current, send out police whistle sound, switch also has one grade to be the state that closes.Glittering with D1 in the time of above-mentioned sounding, as long as power supply has electricity, circuit is unimpeded, D2 is just bright, in addition, and the utility model not power consumption under waiting status, good looking appearance, easy to operate.

Claims

1, a kind of hum photodetection instrument comprises probe (1), shell (4), switch (3), luminous indication (2), and direct supply, loudspeaker, electronic component and lead are housed in the shell, and luminous indication (2) comprises that on/off shows light emitting diode D ₂Show light emitting diode D with signal ₁, electronic component comprises the field effect transistor BG that is used to survey AC signal ₂, play the triode BG of on-off action ₃, resistance R ₂, R ₃, R ₆, capacitor C ₁, C ₂, field effect transistor BG ₂Source electrode and the drain electrode between be connected to resistance R ₁, it is characterized in that:

A. above-mentioned switch (1) is four selector switch of three-group linkage;

B. above-mentioned probe (1) is a combined probe, and another field effect transistor BG is arranged ₁, BG ₁With BG ₂Drain electrode join, grid as the probe (1) contact;

C. above-mentioned BG ₃Collector be connected to compound transistor BG ₄, BG ₅, BG ₃Collector and BG ₄Base stage join middle series connection variable resistor R ₅, also be connected to by resistance R ₄Branch road with socket ZD composition;

D. above-mentioned BG ₄And BG ₅Emitter insert the input end of an integrated package KD9561, the output termination loudspeaker of KD9561 respectively.

2, hum photodetection instrument according to claim 1, it is characterized in that on first group of four selector switch of above-mentioned three groups of positions interlock three select contacts respectively with the source electrode of BG1, the source electrode of BG2, R2 branch road join, and public contact connects the base stage of BG3; On second group three select contacts all to join with the common port of BG1, BG2, BG5, its public contact connects positive source; Three selections on the 3rd group are touched first and are connect sky, and the common port with BG1, BG2 links to each other, and another meets KD9561, and its public contact inserts KD9561, more than three groups the 4th select the contact all to connect sky.

3, hum photodetection instrument according to claim 1 is characterized in that being inserted with on the above-mentioned socket ZD twin-core plug (5).