CN2141085Y - Acoustooptic instrument for measuring voltage - Google Patents

Abstract

Disclosed is an acoustooptic instrument for measuring voltage, which is composed of a contact detection circuit, an induction detection amplifying circuit, a filter voltage amplifying and controlling circuit, an audio oscillating and acoustooptic displaying circuit, a power circuit, a positive pole outputting sheet for power supply, etc. The utility model is characterized in being additionally provided with the contact detection circuit, the filter voltage amplifying and controlling circuit, and the positive pole outputting sheet for power supply. The utility model which is of stable performance can alone test, can discern the phase wire of a cable and the zero wire of the cable, and can discern the phase wire of twisted wire and the zero wire of the twisted wire, and can discern the on-off of the cable without the power supply and the on-off of the cable with the power supply.

Description

Acoustooptic instrument for measuring voltage

The utility model belongs to a kind of electric testing instrument, is mainly used in distinguishing of phase line and zero line, and the acousto-optic of active and passive foreskin lead break-make shows measurement.

For a long time, the electrician utilizes test pencil difference phase line and zero line, but owing to induced potential between the lead is very strong, and the restriction of natural conditions, can not reliably show.No. 8 Patent Gazette for Utility Models of the 7th volume in this year, announced that a kind of application number is the patented claim of 902096559 " cable, electric wire somascope ", its primary structure is to be made of induction detector amplifier, audio oscillation sound and light show circuit and DC power supply circuit, solve the deficiency of above-mentioned test pencil, also can lean on sound, light to distinguish to the break-make of charged cable, electric wire simultaneously.But this somascope is because non-contact can not contact conductor, the charged state of pair twist zygonema can not directly be recognized and can not distinguish the break-make of cold cable, electric wire, self also can not verification, the structural scarce limit of this somascope in addition, amplitude to signal level can not be controlled, and causes the duty potentially unstable.

The purpose of this utility model exactly in order to overcome the deficiency of above-mentioned technology, provides a kind of acousto-optic current measuring instrument of multi-functional stable performance.

The utility model is to realize like this, the voltage signal input circuit that it is composed in parallel by contact detecting circuit (1) and induction detector amplifier (2), through filtering voltage amplification control circuit (3), trigger audio oscillation sound and light show circuit (4), and DC power supply circuit (5) and positive source output chip (6) formation.Be characterized in that this current measuring instrument has increased contact detecting circuit (1) and filtering voltage amplification control circuit (3) and positive source output chip (6).Described contact detecting circuit (1), it is by metal contact Q, resistance in series R1, the base stage of another termination triode BG1 of R1, the emitter and collector of BG1 inserts the positive pole of A point and direct supply respectively and forms.Said filtering voltage amplification control circuit (3), it is by triode BG4, and the adjustable resistance WR2 that is connected to the capacitor C 1 between this pipe base stage and the positive source and is connected to this pipe emitter forms.

The utlity model has following advantage and good effect:

1, stable performance, and have self checking function;

2, function is many, can not only distinguish the phase line and the zero line of cable, twisted conductor, can also check the break-make of active passive cable, electric wire.

Below in conjunction with accompanying drawing, the utility model is further described.Fig. 1 is a circuit structure block scheme of the present utility model, wherein 1 is the contact detecting circuit, the 2nd, the induction detector amplifier, the 3rd, the filtering voltage amplification control circuit, the 4th, the audio oscillation sound and light show circuit, the 5th, DC power supply circuit, the 6th, positive source output chip, Fig. 2 are the electron device key wiring diagrams of a kind of embodiment of the present utility model, and wherein Q is a metal contact, R1 is the resistor of resistance 1-15M Ω, WR2 is the adjustable resistance of resistance 82K Ω, and C1 and C2 are that capacity is the ceramic capacitor of 0.02uf, and LED1 is a LE type light emitting diode, Y is a HTD27A-1 type piezoelectric ceramics sound sheet, BG1-BG5 is a 3DG type transistor, and BG6 is a 3CG type transistor, the 6th, and the positive source output chip, O is the annular opening antenna made from copper sheet, and DC is the direct supply of 3V-4.5V.Its connection is: metal contact Q is connected with R1 one end, the base stage of another termination BG1 of R1, the emitter of BG1 connects the A point, the collector of BG1 connects common ground, the emitter of BG2 connects the base stage of BG3, and the collector of BG3 connects common ground, and the emitter of BG3 connects the A point, the termination A point of C1, another termination common ground.The base stage of triode BG4 connects the A point, its collector connects common ground, emitter connects the end of adjustable resistance WR2, the base stage of another termination triode BG5 of WR2, the emitter of BG5 connects the negative pole of power supply DC, its collector connects the base stage of BG6, the emitter of BG6 connects common ground, one end of its collector and capacitor C 2, the positive pole of LED 1, the end of piezoelectric ceramics sound sheet Y joins, the base stage of another termination BG5 of C2, the negative pole of LED1 connects the DC negative pole, another termination common ground of Y, and the positive pole of DC is drawn lug plate 6.

Below in conjunction with Fig. 2 principle of work of the present utility model is explained: by Q, R1, the contact detecting circuit (1) that BG1 forms, with by O, BG2, the induction detector amplifier (2) that BG3 forms, formed a shunt voltage signals collecting input circuit, when its positive voltage signal that collects arrives the A point, after C1 filtering, enter BG4 and carry out voltage amplification, for preventing this overtension, cause BG5 saturated, make audio oscillation acousto-optic thereafter show cisco unity malfunction, so between the base stage of the emitter of BG4 and BG5, be provided with an adjustable resistance WR2, when the BG4 output voltage is excessive, regulate WR2, the Vebo that makes BG5 is about 0.7 volt, and maximum is no more than the linear amplification scope of BG5.Through filtering voltage amplification control circuit (3), export an effective positive voltage like this, trigger audio oscillator circuit (4), and demonstration sound, light.When with contacting contact Q on the other hand, during another hand contact positive source output chip 6, show acousto-optic as if this instrument, then Instrument working state is normal, otherwise this current measuring instrument has fault, this can self check, and utilizes this point to distinguish the break-make of passive cable, electric wire simultaneously.

Claims (3)

1, a kind of acousto-optic current measuring instrument, the voltage signal input circuit that it is composed in parallel by contact detecting circuit (1) and induction detector amplifier (2), through filtering voltage amplification control circuit (3), trigger audio oscillation sound and light show circuit (4), and DC power supply circuit (5) and positive source output chip (6) formation, it is characterized in that: this current measuring instrument has increased contact detecting circuit (1) and filtering voltage amplification control circuit (3) and positive source output chip (6).

2, according to the described acousto-optic current measuring instrument of claim 1, it is characterized in that described contact detecting circuit, it is by metal contact Q, resistance in series R1, the base stage of another termination triode BG1 of R1, the emitter and collector of BG1 inserts the positive pole of A point and direct supply respectively and forms.

3, according to the described acousto-optic current measuring instrument of claim 1, it is characterized in that, described filtering voltage amplification control circuit (3), it is made up of triode BG4 and the adjustable resistance WR2 that is connected to the capacitor C 1 between this pipe base stage and the positive source and is connected to this pipe emitter thereof.