CN2112158U

CN2112158U - Test pencil using acoustooptic determing voltage value

Info

Publication number: CN2112158U
Application number: CN 92204016
Authority: CN
Inventors: 孙凯
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-03-12
Filing date: 1992-03-12
Publication date: 1992-08-05

Abstract

Disclosed is a test pencil using acoustic-optic to detect a voltage value, comprising two insulating housing, two metallic detecting heads, and conducting wire. One insulating housing is provided with three sets of circuits, namely, a voltage regulator circuit for voltage transformation, a voltage indicating circuit, and a tone circuit, wherein, the voltage regulator circuit for voltage transformation is composed of a transformer, a rectifying device and a voltage regulating device; the voltage indicating circuit is composed of an integrated circuit, light emitting diodes, a resistance sampling network, and a range switch; the tone circuit is connected with a buzzer. In use, the utility model can identify the size of voltage and can identify whether current exists according to the luminescence of different light emitting diodes and the sonification pitch of the buzzer. The utility model which is not provided with power supply has the advantages of convenient observation and convenient operation.

Description

Test pencil using acoustooptic determing voltage value

The utility model relates to a kind of test pencil, particularly recognizes the test pencil of voltage swing with acousto-optic.

Universal electric meter and neon tube test pencil are arranged in the normally used survey electric tool.Though multimeter measuring accuracy height, volume is big, and inconvenience is carried, and is difficult for when light is dark observing; Though the luminous indication of neon tube test pencil energy is charged, but light is darker, can not distinguish voltage swing, simultaneously also can be luminous when measuring induced voltage, make the people can't judge whether really to have, can not satisfy the requirement that not only is easy to carry but also can predicts voltage swing, so convenient inadequately.

The purpose of this utility model is that a kind of test pencil with acousto-optic identification voltage swing will be provided.It can predict the size of voltage and whether electricity is arranged with acousto-optic, also is easy to carry, and is easy to use.

The purpose of this utility model is achieved in that this test pencil with acousto-optic identification voltage swing, is made of two insulation crusts, two metal gauge heads and lead; In insulation crust, be provided with three kinds of circuit therein, i.e. the voltage transformation mu balanced circuit of being made up of transformer, rectification and stable-pressure device is by integrated circuit, row's light emitting diode, the voltage indicating circuit that sample resistance network and range switch are formed; And constituted by the tone circuit that the time base circuit that is connected with hummer, electric capacity, resistance is formed.When two test pencil gauge heads touched the measured point respectively, the voltage between the measured point was transformed into low voltage through voltage transformation and mu balanced circuit with tested voltage scale, sent into and measured and indicating circuit harmony demodulation circuit; Measurement and indicating circuit just drive different lumination of light emitting diode according to voltage, are used to refer to the height of tested voltage; The tone circuit just changes with tested magnitude of voltage and changes the frequency of sounding, and drives hummer then and sounds, and makes the people can hear different acoustic.

Advantage of the present utility model is that volume is little, is easy to carry, can be by sound and different light emitting diodes luminous, and the size of judgement point-to-point transmission voltage, change in voltage situation and whether charged, and do not need power supply, even under dark surrounds, also to be convenient to observe, signal is obvious.

Concrete structure of the present utility model is provided by following examples and accompanying drawing thereof:

Fig. 1 is the utility model structure member installation site synoptic diagram.

Fig. 2 is that different light emitting diodes and two-way switch are annotated the sign synoptic diagram in the utility model.

Fig. 3 is an inner structure synoptic diagram in the utility model.

Fig. 4 is the utility model circuit diagram, wherein

I is voltage transformation and mu balanced circuit synoptic diagram.

II is to measure and the indicating circuit synoptic diagram.

III is the tone circuit diagram.

Describe in detail below in conjunction with accompanying drawing:

With reference to accompanying drawing, this device is by insulation crust 1,2, metal gauge head 3, and the lead 4 that connects gauge head constitutes, and in insulation crust 1, has only lead to pass, in insulation crust 2, be provided with voltage transformation mu balanced circuit I, be connected with the voltage indicating circuit II of row's light emitting diode 5 and the tone circuit III that is connected with hummer 6, on the surface of insulation crust 2, the corresponding aperture that must expose device that leaves.Voltage transformation and mu balanced circuit I are by transformer 7 silicon rectification bridges 8, filtering constitutes with electric capacity 9 and three terminal regulator 10, when gauge head touches the measured point, alternating current is and is switched on the transformer 7, when it elementary is connected to AC power, secondarily level promptly induce one with the elementary proportional and alternating voltage that reduces, this alternating voltage is sent into silicon rectification bridge 8 rectifications, through electric capacity 9 filtering, obtain reflecting the DC voltage of tested AC supply voltage, this DC voltage is delivered to and is measured and indicating circuit, and three terminal regulator 10 produces a galvanic current and presses, through electric capacity 9 filtering, send into tone circuit III.

Be connected with the measurement and the voltage indicating circuit II of row's light emitting diode 5, by model is the integrated circuit 11 of LH3914, include the light emitting diode 5 of D1～D10, resistance, and potentiometer sample resistance network and the range switch 18 formed constitute, 10 light emitting diodes 5 are in order to indicate having or not and height of tested voltage, integrated circuit LM3914 inside includes reference power supply and comparer, when importing under the different voltage condition at its 5th pin, it can drive different lumination of light emitting diode according to the voltage height is different on 5 pin, with the height of instructed

voltage.By resistance

12,13, the sample resistance network that trimmer

potentiometer

14,15,16,17 is formed can be calibrated test pencil by adjusting

trimmer potentiometer

14,15,16,17.Being the 380V shelves when pushing range switch 18 to the A position, can surveying 320～410 voltage, is the 220V shelves when pushing the B position to, can survey voltage between 160～250V.

Be connected with the tone circuit III of hummer 6, mainly constituted by the time base circuit 22 of model by NE555, time base circuit 22 and resistance 19,20, electric capacity 21 constitutes an oscillator, when the DC voltage of sending here by voltage transformation and mu balanced circuit I different and not simultaneously with tested alternating voltage height, this voltage is delivered to the oscillator that is made of time base circuit 22 through resistance 19, its oscillation frequency is changed, the signal that is produced is exported by 22 3 pin, through resistance 23, electric capacity 24 is added on the hummer 6, makes it that sound equipment take place, and can come from the size that the different height that produce sound equipment of its oscillation frequency are discerned voltage simultaneously.

During the utility model assembling, should calibrate, promptly when toggle switch 18 is the 220V shelves, insert the 160V50Hz sinusoidal ac with gauge head, transfer potentiometer 17 to make the D1 in the light emitting diode 5 just luminous, insert the 250V50Hz sinusoidal ac with gauge head again, transfer potentiometer 17 to make D10 just luminous; Equally, when toggle switch 18 is the 380V shelves, insert the 320V50Hz sinusoidal ac, transfer potentiometer 15 to make D1 just luminous, insert the 410V50Hz sinusoidal ac with gauge head again, transfer potentiometer 14 to make D10 just luminous with gauge head.

When the utility model uses, housing 2 is had the one side of light emitting diode towards the user, so that observe, contact measured body respectively with two gauge heads, light situation from light emitting diode, whether electricity and voltage height is arranged as can be known, when using the 220V shelves to measure, if during tested undertension 160V, then light emitting diode is all not luminous, when tested voltage is between 160V～250V, corresponding light emitting diode just can be luminous, when tested voltage surpassed 250V, then light emitting diode D10 lighted always, and meanwhile the sound equipment of hummer also changes.Its working method is identical with 220V class person when using the 380V shelves instead.

Claims

1, a kind of test pencil, particularly recognize the test pencil of voltage swing with acousto-optic, by insulation crust 1,2, metal gauge head 3, and the lead 4 that connects gauge head constitutes, it is characterized in that: in insulation crust 1, have only lead 4 to pass, in insulation crust 2, be provided with voltage transformation mu balanced circuit I, be connected with the measurement and the voltage indicating circuit II of row's light emitting diode and the tone circuit III that is connected with hummer, and on the surface of shell 2, the corresponding aperture that must expose device that leaves.

2, the test pencil with acousto-optic identification voltage swing according to claim 1, it is characterized in that described voltage transformation and mu balanced circuit I are made of with electric capacity 9 and three terminal regulator 10 transformer 7, silicon rectification bridge 8, filtering, the gained electric current simultaneously leads to be measured and the indicating circuit II, and one side is led to tone circuit III.

3, the test pencil with acousto-optic identification voltage swing according to claim 1, it is characterized in that described measurement and the voltage indicating circuit II that is connected with row's light emitting diode, by integrated circuit LH3914, light emitting diode 5, sample resistance network and range switch 18 that resistance and potentiometer are formed constitute, and change the voltage of back by the 5th pin input of integrated circuit LH3914.

4, the test pencil with acousto-optic identification voltage swing according to claim 1 is characterized in that the described tone circuit III that is connected with hummer 6, and by time base circuit 22, hummer 6 and the oscillator that is made of resistance, electric capacity are constituted.