CN2136474Y

CN2136474Y - Test pencil with sound-and-light alarm

Info

Publication number: CN2136474Y
Application number: CN 92230634
Authority: CN
Inventors: 陈士华
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-08-18
Filing date: 1992-08-18
Publication date: 1993-06-16
Anticipated expiration: 2002-08-18

Abstract

The utility model discloses a test pencil with a sound-and-light alarm, which is composed of a probe, and a current-limiting resistor, a neon bulb, a spring, a copper electrode positioned in a pencil and a pencil cap. The utility model also comprises a sound alarming device formed by the method that the triggered end of a soft packaging CMOS integrated circuit is connected with the neon bulb by the spring, the output end is connected with the base electrode of a triode, other two ends are respectively connected with both ends of the power source, the emitter of the triode is connected with the minus pole of the power source, and the integrated circuit is connected with the positive pole of the power source via a sounder. When the utility model is used for checking, the neon bulb emits light when electricity exists and the neon bulb sends out the alarm sound at the same time; the sound and the light disappear simultaneously when the utility model is removed. Even though the battery runs out or the circuit is broken suddenly and the alarming operation can not carried out, the neon bulb can still work normally without affecting the function of testing the electricity.

Description

Test pencil with sound-and-light alarm

The utility model relates to a kind of improved electrical test pencil, sound and light alarm test pencil.

Test pencil is good and cheap, safe because of it, reliable as the easiest survey instrument of picking up, and is extensively popularized by people and uses.It is to judge by neon tube is whether luminous whether measured object charged, thus when evening and light are dark reflection obviously, and in place outdoor and that light is stronger, difficulty is debated not, shows not obviously, causes illusion easily.Be head it off, the patent No. 91214888.8 " music test pencil " just utilizes sound and light alarm to remedy above-mentioned weak point; But this test pencil use the back musical sound really to last till sung till.

The purpose of this utility model is to provide a kind of sound and light alarm test pencil, and acousto-optic can show simultaneously during use, and after using, acousto-optic can disappear simultaneously.

The utility model is achieved in that by probe, the current-limiting resistance, neon tube, spring, copper electrode and the pen cap that are placed in the pen are formed, comprise that also the trigger end by soft encapsulation CMOS integrated circuit is connected with neon tube by spring, output terminal is connected with the base stage of triode, two ends connect the two ends of power supply respectively in addition, the emitter of triode connects power cathode, and collector connects the audible alarm unit that positive source is formed by acoustical generator.

Fig. 1. structural representation of the present utility model.

Fig. 2. wiring diagram of the present utility model.

Below in conjunction with accompanying drawing embodiment of the present utility model is further described:

The probe (1) of screwdriver-like is made in penholder (2) front end die casting, making test pencil can make screwdriver uses, current-limiting resistance (3), neon tube (4) contact with copper electrode (5) by spring (6), and copper electrode (5) exposes the outside surface of penholder (2), and is the same with commercially available test pencil.

Power supply (11) E is a button cell, and acoustical generator (8) is a contact pin type, compact electromagnetic sound equipment DYX.The pen cap (9) is made of aluminum alloy materials, on a square sound hole (10) that helps is arranged, make chimes of doom more loud and clear, the lower end be pressed on that copper electrode (5) is gone up and with its good contact.

Circuit board (7) is soft encapsulation CMOS integrated circuit, and power supply (11) is fixed on the circuit board (7), and acoustical generator (8) directly is welded on the circuit board (7), and circuit board (7) external diameter and the pen cap (9) internal diameter close-fitting are fixed in the pen cap (9).

The trigger end of CMOS integrated circuit is connected with neon tube (4) by spring, output terminal is connected with the base stage of triode BG, two ends connect the two ends of power supply (11) respectively in addition, the emitter of triode BG connects power supply (11) negative pole, collector is formed audible alarm unit by the positive pole that acoustical generator (8) connects power supply, and neon tube (4) end in addition is connected as shown in Figure 2 with probe (1) by current-limiting resistance (3).

During use test probe (1) is contacted with tested metal, hand is held the pen cap (9) part, does not have electricity as measured object, and then test pencil is reactionless.Charged as measured object, electric current triggers the CMOS integrated circuit by the small alternating voltage that probe (1), current-limiting resistance (3) and neon tube (4) produce by spring (6), make triode BG conducting, send loud and clear chimes of doom by acoustical generator (8), neon tube (4) is shinny simultaneously.Taking away the test pencil acousto-optic disappears simultaneously.

The utility model is compared with prior art picked up when neon tube is shinny when surveying and is sent chimes of doom, and test pencil when taking away acousto-optic disappear simultaneously, simple and easy to use. And audible alarm circuit independence is strong, can not audible alarm even forgotten replacing or circuit accidental damage after battery uses up, do not affect yet survey Electricity Functional still can be shinny because of the neon tube part, as usual demonstration work, stable performance, safety, reliably. Though increased the audible alarm circuit, whole circuit part all is contained in the pen cap, does not also need any switch control, and whole test pencil volume is the same with existing test pencil big, and is cheap, easy to carry. It is the ideal product of test pencil upgrading.

Claims

1, a kind of sound and light alarm test pencil is by probe (1), the current-limiting resistance (3), neon tube (4), copper electrode (5), spring (6) and the pen cap (9) that are placed in the pen are formed, it is characterized in that also comprising that the trigger end by soft encapsulation CMOS integrated circuit is connected with neon tube (4) by spring (6), output terminal is connected with the base stage of triode, two ends connect the two ends of power supply respectively in addition, the emitter of triode connects power cathode, and collector connects the audible alarm unit that positive source is formed by acoustical generator (8).

2, test pencil according to claim 1 is characterized in that power supply (11) is a button cell, and acoustical generator (8) is compact electromagnetic sounder DYX, and the pen cap (9) is made of aluminium alloy, on a square sound hole (10) that helps is arranged.The lower end is pressed on the copper electrode (5).

3, test pencil according to claim 1 and 2, it is characterized in that circuit board (7) is soft encapsulation CMOS integrated circuit, power supply (11) is fixed on the circuit board (7), acoustical generator (8) directly is welded on the circuit board (7) for contact pin type, circuit board (7) external diameter and the pen cap (9) internal diameter close-fitting are fixed in the pen cap (9).