CN201477175U

CN201477175U - Multifunctional test pencil

Info

Publication number: CN201477175U
Application number: CN2009203062305U
Authority: CN
Inventors: 叶成城
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-07-15
Filing date: 2009-07-15
Publication date: 2010-05-19
Anticipated expiration: 2019-07-15

Abstract

The utility model relates to a multifunctional test pencil comprising a signal amplifying circuit, an audible and visual alarming circuit, a test contact and a touch electrode, wherein the signal amplifying circuit comprises a triode, and the audible and visual alarming circuit is composed of an LED lamp and a speaker. The multifunctional test pencil is simple in structure and high in sensibility, has more than ten functions such as testing on and off of electric devices, testing short circuit of electric devices, testing conductors, semi-conductors and insulators, testing behavior and polarity of a diode, being used as emergency lighting at night and the like, and is a good assistant for electronic fabrication, electrician operations and home appliance repair.

Description

Multi-functional electroprobe

Technical field

The utility model relates to the equipment that a kind of instructed voltage exists, especially a kind of electroprobe.

Background technology

The electroprobe of Chu Shouing generally is to be in series by test contact, metal spring, current-limiting resistance, neon lamp and hand touched electrode in the market, and its weak point is that the neon lamp demonstration is not obvious, and structure is complicated, and has only a kind of contact electroscope function, function singleness; Owing to do not adopt electron device, sensitivity is not high.

Summary of the invention

Technical problem to be solved in the utility model is, multi-functional, simple in structure, highly sensitive electroprobe is provided.

For solving the problems of the technologies described above, the utility model is by the following technical solutions: a kind of magical electroprobe, include plastic casing, test contact, the hand touched electrode, the LED lamp, power supply, it is characterized in that also including first triode, second triode, the 3rd triode, current-limiting resistance, described first transistor base connects test contact, described first transistor emitter is connected with second transistor base, described second transistor emitter is connected with the 3rd transistor base, described first transistor collector and second transistor collector are connected in circuit node, described LED lamp is anodal to be connected with circuit node, described LED lamp negative pole is connected with the 3rd transistor collector, described positive source is connected with circuit node, described power cathode is connected with the 3rd transistor emitter, described current-limiting resistance one end connecting circuit node, the described current-limiting resistance other end connects the hand touched electrode.

The magical electroprobe of the utility model utilizes first triode, second triode to constitute the signal amplifying return circuit, when test contact is sensed faint signal, equal to have added bias voltage in test contact, make the 3rd triode conducting through amplifying, the conducting of luminous loop, the LED lamp is luminous, and prompting has voltage to exist, parts are few, and are simple in structure; The signal amplifying return circuit enlargement factor height that first triode, second triode constitute, highly sensitive; The magical electroprobe of the utility model has the whether short circuit of break-make road, test electrical equipment, tested conductor, semiconductor and insulator, measuring diode quality and the polarity of self check, test electrical equipment, as a plurality of functions such as emergency lightings at night.

The utility model will be further described below in conjunction with the drawings and specific embodiments.

Description of drawings

Fig. 1 is the structural representation of the magical electroprobe of the utility model;

Fig. 2 is the circuit theory diagrams of the magical electroprobe of the utility model.

Embodiment

As Fig. 1, shown in Figure 2, a kind of magical electroprobe, include plastic casing 1, test contact 2, hand touched electrode 3, LED lamp L, power supply E, also include the first triode V1, the second triode V2, the 3rd triode V3, current-limiting resistance R, the described first triode V1 base stage connects test contact 2, the described first triode V1 emitter is connected with the second triode V2 base stage, the described second triode V2 emitter is connected with the 3rd triode V3 base stage, the described first triode V1 collector and the second triode V2 collector are connected in circuit node P, described LED lamp L is anodal to be connected with circuit node P, described LED lamp L negative pole is connected with the 3rd triode V3 collector, described power supply E is anodal to be connected with circuit node P, described power supply E negative pole is connected with the 3rd triode V3 emitter, described current-limiting resistance R one end connecting circuit node P, the described current-limiting resistance R other end connects hand touched electrode 3.The magical electroprobe of the utility model utilizes the first triode V1, the second triode V2 to constitute the signal amplifying return circuit, when test contact 2 is sensed faint signal, equal to have added bias voltage in test contact 2, make the 3rd triode V3 conducting through amplifying, the conducting of luminous loop, L is luminous for the LED lamp, and prompting has voltage to exist, and is simple in structure; The signal amplifying return circuit enlargement factor height that the first triode V1, the second triode V2 constitute, highly sensitive; The magical electroprobe of the utility model also has a plurality of functions of following argumentation.When magical electroprobe is carried out self check, with contacting hand touched electrode 3, another hand engaged test contact 2 on the other hand, human body is equivalent to a small resistor, pin equals to hold contiguously, and human body and current-limiting resistance R dividing potential drop produce weak voltage in test contact 2, equal to have added bias voltage in test contact 2, make the 3rd triode V3 conducting through amplifying, the conducting of luminous loop, L is luminous for the LED lamp, proof electroprobe itself is working properly, finishes self-checking function; When the break-make road of test electrical equipment, with contacting hand touched electrode 3 on the other hand, one end of another hand contact electrical equipment, the other end of test contact 2 contact electrical equipment, if the bright expression of LED lamp L is a path, expression is not to open circuit if LED lamp L works, and same principle can tested conductor, the base stage and the type of semiconductor and insulator, measuring diode quality and polarity, measurement triode; Whether when with magical electroprobe test electrical equipment during short circuit, with contacting hand touched electrode 3 on the other hand, test contact 2 contacts electrical equipment, if short circuit then electrical equipment has voltage, the LED lamp is luminous, if do not have short circuit then the LED lamp is not luminous; The utility model also have test capacitors whether quality and estimation capacitance, test solution ion concentration, test battery both positive and negative polarity, test water level, test bearing fault, as functions such as emergency lighting at night, test zero live wires.

As a kind of improvement, described LED lamp L two ends are parallel with a circuit branch, and described branch road is provided with K switch, the loudspeaker S that is connected in series.Utilize the disjunction of K switch can realize whether the loudspeaker loop works, when switch when closing, during the conducting of luminous loop, electroprobe not only sends wigwag, and the loudspeaker signal prompt of sounding; When switch when dividing the position, during the conducting of luminous loop, this moment, electroprobe only sent wigwag, this occasion can be used magical electroprobe when the emergency lighting at night.

As a kind of concrete application mode, the Standard resistance range of described current-limiting resistance R is 1M Ω～2M Ω.Current-limiting resistance R is current limliting too hour well, and electric consumption E energy; Equal to open circuit the electroprobe cisco unity malfunction when too big.

As a kind of concrete application mode, described triode enlargement factor β 〉=60, can get 60 or 70 or 80, triode enlargement factor β is when this scope value, can guarantee that electroprobe has enough sensitivity, simultaneously the triode of this span is more stable, be difficult for producing the self-excitation wild effect, in application without negative feedback measure stabilizing circuit.

As a kind of concrete application mode, described loudspeaker S adopts piezoelectric type.In piezoelectricity at present commonly used, moving iron, moving-coil, static, loudspeaker technology such as pneumatic, adopt the piezoelectric type loudspeaker can bring into play its efficient height, characteristics that frequency is high, can ignore in the application scenario of electroprobe and its shortcoming such as distortion are big etc., and the price material benefit.

As a kind of concrete application mode, described power supply E is No. 7 batteries of two joints.Adopt No. 7 batteries of two joints can satisfy the requirement of magical electroprobe to power source performance, No. 7 battery prices material benefit simultaneously, technology maturation, buying are the good selections of power supply aspect conveniently.

The utlity model has characteristics such as multi-functional, simple in structure, sensitivity height, is the good assistant of electronic production, electrician's operation, household appliances maintenance.

More than explanation is just illustrative for the utility model; and it is nonrestrictive; those of ordinary skills understand; under the situation of the spirit and scope that do not break away from following claims and limited; can make many modifications; change, or equivalence, but all will fall in the protection domain of the present utility model.

Claims

1. multi-functional electroprobe, include plastic casing (1), test contact (2), hand touched electrode (3), LED lamp (L), power supply (E), it is characterized in that also including first triode (V1), second triode (V2), the 3rd triode (V3), current-limiting resistance (R), described first triode (V1) base stage connects test contact (2), described first triode (V1) emitter is connected with second triode (V2) base stage, described second triode (V2) emitter is connected with the 3rd triode (V3) base stage, described first triode (V1) collector and second triode (V2) collector are connected in circuit node (P), described LED lamp (L) is anodal to be connected with circuit node (P), described LED lamp (L) negative pole is connected with the 3rd triode (V3) collector, described power supply (E) is anodal to be connected with circuit node (P), described power supply (E) negative pole is connected with the 3rd triode (V3) emitter, described current-limiting resistance (R) end connecting circuit node (P), described current-limiting resistance (R) other end connects hand touched electrode (3).

2. multi-functional electroprobe according to claim 1 is characterized in that described LED lamp (L) two ends are parallel with a circuit branch, and described circuit branch is provided with switch (K), the loudspeaker (S) that are connected in series.

3. multi-functional electroprobe according to claim 1 and 2, the Standard resistance range that it is characterized in that described current-limiting resistance (R) are 1M Ω～2M Ω.

4. multi-functional electroprobe according to claim 1 and 2 is characterized in that described triode enlargement factor β 〉=60.

5. multi-functional electroprobe according to claim 3 is characterized in that described triode enlargement factor β 〉=60.

6. multi-functional electroprobe according to claim 2 is characterized in that described loudspeaker (S) adopt piezoelectric type.

7. multi-functional electroprobe according to claim 1 and 2 is characterized in that described power supply (E) is No. 7 batteries of two joints.

8. multi-functional electroprobe according to claim 3 is characterized in that described power supply (E) is No. 7 batteries of two joints.

9. multi-functional electroprobe according to claim 4 is characterized in that described power supply (E) is No. 7 batteries of two joints.

10. multi-functional electroprobe according to claim 5 is characterized in that described power supply (E) is No. 7 batteries of two joints.