CN202676795U - Induction-type test pencil with simple, practical and high sensitivity characteristics - Google Patents
Induction-type test pencil with simple, practical and high sensitivity characteristics Download PDFInfo
- Publication number
- CN202676795U CN202676795U CN 201220312399 CN201220312399U CN202676795U CN 202676795 U CN202676795 U CN 202676795U CN 201220312399 CN201220312399 CN 201220312399 CN 201220312399 U CN201220312399 U CN 201220312399U CN 202676795 U CN202676795 U CN 202676795U
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- triode
- test pencil
- button cell
- light emitting
- emitting diode
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Abstract
The utility model relates to an induction-type test pencil with simple, practical and high sensitivity characteristics. The test pencil comprises an insulation pencil body with a clip, a metal nib, triodes, a light emitting diode, a touch switch and a button cell. The test pencil is characterized in that: the other end of the nib which is extruded out of the pencil body is connected with a base electrode of a triode BG1; the triode BG1 and a triode BG2 form a composite triode which is connected with a triode BG3 so as to form a direct coupling emitter following amplification circuit; a collector of the triode BG3 is connected with a cathode of the light emitting diode; an emitting electrode of the triode BG3 is connected with the cathode of the button cell; an anode of the button cell is connected with the touch switch; the other end of the switch is connected with the anode of the light emitting diode and the collectors of the triode BG1 and the triode BG2. By using the test pencil of the utility model, whether there is electricity can be known without contacting an electrified body; whether an internal lead is charged can be perceived through an insulated wire slot and a shallow-layer wall body; a live wire and a zero line can be distinguished or the test pencil can be served as a broken line tracing instrument. The structure is simple. Sensitivity is high and security is good.
Description
Technical field
The utility model relates to a kind of test pencil, is a kind of simple, practical, highly sensitive induction type test pencil specifically.
Background technology
Whether present general test pencil adopts the direct contact electrification body of metal contact to see more charged, owing to needing participating in directly of human body, just there is certain danger in this, and in some specific occasion, the test pencil contact can't arrive, and has also therefore affected work.
Summary of the invention
The purpose of this utility model provides so a kind of electronic test pencil, its simple structure, and Lay Importance on Practical is abandoned complicated electronic circuit and the function that is of little use, targetedly selection, thereby simple, safe, reliable, highly sensitive.
The utility model comprises insulation handwriting, metal nib, triode, light emitting diode, touch-switch, the button cell with pen clip.The base stage of the other end connecting triode BG1 of the metal nib that outstanding insulation handwriting is outer, triode BG1 and triode BG2 form compound transistor, be connected into direct-coupling emitter following amplifying circuit with triode BG3, the collector of triode BG3 and the negative pole of light emitting diode join, emitter and the button battery cathode of triode BG3 join, the anodal touch-switch that connects of button cell, the collector of the other end of switch and light emitting diode positive pole, triode BG1 and triode BG2 joins.
Description of drawings
Fig. 1 is the utility model circuit theory diagrams.
Fig. 2 is the utility model inner structure schematic diagram.
Among the above-mentioned figure, comprise insulation handwriting 1, metal nib 2, triode BG1, BG2, BG3, LED, button cell E, touch-switch K.
Embodiment
Referring to Fig. 1, Fig. 2, metal nib, triode BG1, BG2, BG3, LED, button cell E, K switch connect by figure, and triode BG1, BG2, BG3 select 9016, and enlargement factor is greater than 80, collector current 25mA; Light emitting diode is selected the red pipe of BT-201, working current 10-20mA, and limiting current 50mA can omit the light emitting diode protective resistance like this; Button cell is 2 SR44, voltage 3V.Because the utility model sensitivity is good, easily electromagnetic induction occurs and make LED luminous, so the duty that a switch is used for the control test pencil is installed.Touch-switch K is installed in below the pen clip, makes operation more convenient.During work, press pen clip, make the K switch connection, near measured body, behind the nib induction conduction field, electric field signal amplifies and conducting through triode, thereby makes lumination of light emitting diode.Know in actual use (button cell voltage 2.5V), cable luminotron when 3cm begins to light, yarn begins to light when 10cm, and can see through the plastic insulation wire casing and whether shallow-layer body of wall perception inner lead have electricity, but also perception common electric electromagnetic field strong and weak or use as the burn out detection instrument.Because the utility model is highly sensitive, to the difficult difference of nearer live wire, zero line or severed thread end, but behind the segment distance of being separated by, can clearly differentiate live wire, zero line or break point by the luminous degree of light emitting diode apart.
Claims (2)
- One kind simple, practical, highly sensitive induction type test pencil, comprise the insulation handwriting (1) with pen clip, metal nib (2), triode BG1, BG2, BG3, LED, touch-switch K, button cell E, it is characterized in that, the base stage of the other end connecting triode BG1 of the metal nib that outstanding insulation handwriting is outer, triode BG1 and triode BG2 form compound transistor, be connected into direct-coupling emitter following amplifying circuit with triode BG3, the collector of triode BG3 and the negative pole of light emitting diode join, the negative pole of the emitter of triode BG3 and button cell E joins, the anodal touch-switch K that connects of button cell, the other end of switch and light emitting diode are anodal, the collector of triode BG1 and triode BG2 joins.
- 2. test pencil as claimed in claim 1, its used triode model is 9016, and the diode model is BT-201, and button cell is 2 SR44, voltage 3V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220312399 CN202676795U (en) | 2012-07-01 | 2012-07-01 | Induction-type test pencil with simple, practical and high sensitivity characteristics |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220312399 CN202676795U (en) | 2012-07-01 | 2012-07-01 | Induction-type test pencil with simple, practical and high sensitivity characteristics |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202676795U true CN202676795U (en) | 2013-01-16 |
Family
ID=47497693
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220312399 Expired - Fee Related CN202676795U (en) | 2012-07-01 | 2012-07-01 | Induction-type test pencil with simple, practical and high sensitivity characteristics |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202676795U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112526393A (en) * | 2020-11-26 | 2021-03-19 | 广东电网有限责任公司中山供电局 | Metal meter box electric leakage warning device |
-
2012
- 2012-07-01 CN CN 201220312399 patent/CN202676795U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112526393A (en) * | 2020-11-26 | 2021-03-19 | 广东电网有限责任公司中山供电局 | Metal meter box electric leakage warning device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130116 Termination date: 20130701 |