CN2134655Y

CN2134655Y - Acoustooptic electroscope

Info

Publication number: CN2134655Y
Application number: CN 92223043
Authority: CN
Inventors: 汤欣荣
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-05-23
Filing date: 1992-05-23
Publication date: 1993-05-26
Anticipated expiration: 2002-05-23

Abstract

The utility model relates to an acoustic-optic electroscope which can be used for testing an AC circuit under 500V. The utility model has the functions of testing a closed circuit and a broken circuit, testing a phase line on an insulation layer, searching broken circuit points, fixedly testing a capacitor, judging the quality of a PN junction for silicon semiconductor, distinguishing the insulation performance of an electrical apparatus, distinguishing the positive and negative poles of DC power supply, and alarming in acoustic-optic. The utility model is composed of a metallic testing contact terminal, current-limiting resistance, shunt resistance, divider resistance, a compound triode, a light-emitting diode, an audio integrated block, a loudspeaker, a cell support, a battery, a hand contact electrode, and a housing. In use, the acoustic-optic electroscope sounds through the loudspeaker and displays lumination through the light-emitting diode.

Description

Acoustooptic electroscope

The utility model relates to a kind of improved electricity measurer, and is a kind of more precisely except that electrical verification, can survey to open circuit, short circuit, search electric wire inner wire trip point, shows the electricity measurer that can work below 500V simultaneously with acousto-optic.

Existing electricity measurer is mainly by test contact, current-limiting resistance, neon tube or liquid crystal display numeral, symbol or light emitting diode, electronic module, metal spring, the hand touched electrode is composed in series, during electrical verification by the neon tube in the electricity measurer luminous or liquid crystal display or lumination of light emitting diode, the indication measured conductor charged.

But neon tube is an inflation glass tube, leaks gas easily and loses efficacy.Liquid crystal display (numeral, symbol) can't self check, and electric industry rules regulation, must on known energized conductor, test electricity measurer before the electrical verification, confirm that electricity measurer is working properly, can electrical verification on measured conductor, this all is quite to bother to installing and keeping in repair, particularly open circuit in electrical system, when leaking electricity, can only use multimeter to search, multimeter is many gears multirange precision instrument, volume carries inconvenience greatly, operates also more complicated.

Moreover neon tube is luminous, the light emitting diode indication, and light intensity is all less, thus when the high light occasion is used, easily cause and measure error, can't reading when the electricity measurer of liquid crystal display numeral, symbol in the dark uses.

The purpose of this utility model provides a kind of improved electricity measurer, and it can contact, every the insulation course electrical verification, searches insulated line inner wire trip point.Can survey that conductor opens circuit, path, the quality of the quality of qualitative determination small capacitor and silicon semiconductor PN junction judges the both positive and negative polarity of direct supply also to have sound and light of alarm.Whether electricity measurer self work normally also needn't be carried out on known energized conductor, can detect by human body.

The utility model is achieved in that in a plastic casing, pack one into by light emitting diode, the compound amplification of semiconductor, switching tube, audio manifold block, three resistance, the electronic circuit that loudspeaker, battery carrier, battery, spring, hand touched electrode, metal contact are formed.Two low-power transistors are housed, three resistance, a light emitting diode, an audio manifold block, loudspeaker, battery carrier, battery, hand touched electrode, spring, metal contact on printed circuit board (PCB).

Resistance is connected in the collector or emitter circuit of semiconductor complex pipe with after light emitting diode is connected, and the direct current pressure drop at its two ends is for audio manifold block provides power supply.Be connected to a shunt resistance between the base stage of semiconductor complex pipe and emitter, at the front end of complex pipe current-limiting resistance, spring, metal contact be housed, battery is the general supply of circuit, and utmost point of power supply and hand touched electrode are joined.During electrical verification, the metallic test contact contacts with tested metallic object, when if there is voltage in metallic object relative to the earth, this voltage induced is to semiconductor complex pipe base stage, complex pipe conducting, lumination of light emitting diode, integrated package gets electric work, output audio signal promotes the loudspeaker sounding, so reached the purpose of contact electrical verification.

Below in conjunction with accompanying drawing the utility model principle of device and using method are described in more detail.

Fig. 1 be a kind of concrete structure of the utility model the clump to sectional view.

Fig. 2 is an electrical schematic diagram of the present utility model.

With reference to Fig. 1, the metallic test contact 1 with excellent conductive performance and physical strength is moulded casting in insulation crust 2, and test contact 1 is made into screwdriver-like, makes electricity measurer double as screwdriver.Shell 2 is that the plastics that have two windows are made, one window 16, and whether luminous in order to observe light emitting diode, another aperture 13 is used for the air hole of loudspeaker 12.The convex cylindrical cavity is arranged in the shell 2, test contact 1, end at shell 2, put in cavity contacts with spring 3 from conical top, spring 3 other ends and current-limiting resistance 4 join, current-limiting resistance 4 joins with metal contact 19 again, and metal contact 19 is welded on the printed circuit board (PCB) 18 with triode 17 base stages.Shunt resistance 5, triode 7, divider resistance 15, audio manifold block 8, battery carrier 9, loudspeaker 12, hand touched electrode 11, all be welded on the circuit board 18, light emitting diode is welded on the circuit board 18, and luminophor inserts in the aperture 16, plastic casing 2 latter half of from longitudinal center have the removable band cap type of a half block Plastic hanger 10, it is locked with miniature self tapping sieve silk with corresponding second half, or fixes with the pawl interlocking.

With reference to Fig. 2, further specify the realization of principle of the present utility model and purpose:

One, contact electrical verification, every the insulation course electrical verification, search the trip point in the insulated line.

When test contact 1 and tested metallic object join, if during the above voltage of metallic object band alternating voltage 3V, this voltage is by test contact 1, the base stage of current-limiting resistance 4, triode 17, make the base potential of triode 17 be higher than the emitter current potential, triode 17 conductings, it makes triode 7 base potential raise again, so triode 7 conductings, light emitting diode 6 is luminous because of there being electric current to pass through, and the decline of the collector potential of triode 7, and audio manifold block 8 obtains voltage power supply, output audio signal promotes loudspeaker 12 sounding.

When human body contacts with hand touched electrode 11, and with test contact 1 and approaching every the insulation course energized conductor, insulation course inner wire electric field will be sensed on the test contact 1, by current-limiting resistance 4, to the base stage of triode 17, make

triode

17,7 work, light emitting diode 6 is luminous, audio manifold block 8 work, loudspeaker 12 sounding.

According to above-mentioned principle, to there be one of the insulated conductor that opens circuit to be terminated at the AC power phase line, other end insulation, human body contact electricity measurer hand touched electrode 11, and with test contact 1 near tested insulated conductor and the phase line end that joins, light emitting diode 6 is luminous, and loudspeaker 12 sounding move test contact 1 then along insulation course, when moving to the broken string place, test contact 1 readvances, then test contact 1 shift-in with the discontiguous broken string part of phase line, the light of light emitting diode 6 extinguishes, loudspeaker 12 is noiseless.

Two, self detect, survey path, open circuit, the decision circuitry insulating property, judge small capacitor quality and amount of capacity relatively.

Human body contact hand touched electrode 11, the contact of engaged test simultaneously 1, then the positive pole 20 of battery 14 is by hand touched electrode 11, and human body resistance, test contact 1, current-limiting resistance 4 are added on the base stage of triode 17, make triode 17 base potential be higher than the emitter current potential, triode 17 conductings make triode 7 base potential raise then triode 7 conductings, light emitting diode 6 is luminous, audio manifold block 8 gets electric work, and loudspeaker 12 sounding illustrate that electricity measurer is working properly.

In like manner, human body contacts hand touched electrode 11, contacts an end of measured conductor simultaneously, and this conductor other end contacts with test contact 1, if conductor is disconnected, then light emitting diode 6 is luminous, simultaneously loudspeaker 12 sounding.

In like manner, human body contact hand touched electrode 11 contacts simultaneously by the metal shell of electricity measurer, and test contact 1 contacts with tested appliances power source input end lead, at this moment appliance mains switch is in on-state, and appliances power source and electric network source disconnect, if electrical apparatus insulation is functional, then light emitting diode 6 is not luminous, loudspeaker 12 is noiseless, if the electrical apparatus insulation performance well or is not damaged, then light emitting diode 6 is luminous, loudspeaker 12 sounding.

In like manner, survey the small capacitor quality, relatively the electric capacity size: human body contacts hand touched electrode 11, contacts an electrode of tested small capacitor simultaneously, and test contact 1 contacts with another electrode of tested small capacitor.Like this, be equivalent to tested small capacitor and human body resistance, test contact 1, current-limiting resistance 4, the positive pole 20 of triode 17 base stages and power supply 14, form charge circuit, when being good by small capacitor, capacitor is recharged, and charging beginning small capacitor is equivalent to short-circuit line, and charging current is bigger, so light emitting diode 6 is luminous stronger, loudspeaker 12 sounding are normal, and along with the minimizing of charging current, the light of light emitting diode 6 also weakens gradually, extinguish at last, also from normally all undesired noiseless at last to tone etc., above-mentioned tested small container is if capacity is big more, so for loudspeaker 12, light emitting diode 6 is from luminous just long more to the fall time more by force, and loudspeaker 12 is just long more normal last noiseless perdurability from sounding.

In like manner, survey the quality of silicon materials semiconductor PN: human body hand touched electrode 11, touch a utmost point of tested semiconductor PN simultaneously, another utmost point of tested semiconductor PN contacts with test contact 1, survey once, exchange the two poles of the earth of tested semiconductor PN, survey once again, tested semiconductor PN is good, then light emitting diode 6 is luminous, the N district of a very tested semiconductor PN that once joins with test contact of loudspeaker 12 sounding is a negative pole, with palmistry touch one very promptly anodal by the P district of semiconductor PN then, if twice test light emitting diode 6 is all not luminous or all luminous, loudspeaker 12 is all noiseless or all sound, and then PN junction is bad.

Three, sound and light alarm

When hand touched electrode 11 and test contact 1 and any alarm sensor join, as long as the signal that test contact 1 obtains makes triode 17 base potential be higher than the emitter current potential by current-limiting resistance 4, triode 17 conductings, also conducting of triode 7, light emitting diode 6 is luminous, loudspeaker 12 sounding are realized sound and light alarm.

Four, differentiate the both positive and negative polarity of direct supply

Hand touched electrode 11 contacts with an electrode of tested direct supply, another electrode of test contact 1 and tested direct supply joins, if light emitting diode 6 is luminous, and loudspeaker 12 sounding, then an electrode of the tested direct supply that joins with test contact 1 is for anodal, and another is the negative pole of direct supply very.

The utility model has reduced the electrical verification program, has improved failure judgment speed and electrical verification accuracy, has saved high-precision meter.

Claims

1, a kind of electricity measurer is characterized in that; It is by a plastic casing 2, test contact 1, current-limiting resistance 4, spring 3, shunt resistance 5, light emitting diode 6, triode 7,17, audio manifold block 8, divider resistance 15, loudspeaker 12, battery carrier 9, battery 14, metal contact 19, Plastic hanger 10, hand touched electrode 11 is formed.

2, electricity measurer as claimed in claim 1 is characterized in that it forms compound amplification, switching tube with two triodes 7,17.

3, electricity measurer as claimed in claim 1 is characterized in that being connected with a current-limiting resistance 4 between the base stage of triode 17 and test contact 1.

4, electricity measurer as claimed in claim 1 is characterized in that being connected to a shunt resistance 5 between the base stage of triode 17 and power cathode.

5, electricity measurer as claimed in claim 1 is characterized in that it connects with a light emitting diode 6 with a divider resistance 15.

6, electricity measurer as claimed in claim 5 is connected to the collector or the emitter of triode 7 after it is characterized in that divider resistance 15 and light emitting diode 6 being connected.

7, electricity measurer according to claim 1, after it is characterized in that divider resistance 15 and light emitting diode 6 being connected, the pressure drop at its two ends is promptly as the supply voltage of audio manifold block 8.

8, electricity measurer according to claim 1 is characterized in that leaving the mounting hole 16 of luminotron 6 on the insulation shell 2 of its usefulness, and the air hole 13 of loudspeaker 12 is equipped with hand touched electrode 11 and metallic test contact 1.