CN214895488U - Fault self-checking circuit of alternating current test pencil - Google Patents
Fault self-checking circuit of alternating current test pencil Download PDFInfo
- Publication number
- CN214895488U CN214895488U CN202120366695.0U CN202120366695U CN214895488U CN 214895488 U CN214895488 U CN 214895488U CN 202120366695 U CN202120366695 U CN 202120366695U CN 214895488 U CN214895488 U CN 214895488U
- Authority
- CN
- China
- Prior art keywords
- pin
- input circuit
- test pencil
- port
- singlechip
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The utility model discloses an exchange and examine test pencil trouble self-checking circuit, its characterized in that: including response sheetmetal, sensing signal input circuit, fault detection input circuit, singlechip, the response sheetmetal has two welding pin, including pin a, pin b, pin a with the port P1 of singlechip is connected and constitutes sensing signal input circuit, pin b through middle connecting terminal c with the port P2 of singlechip is connected and constitutes fault detection input circuit. The problem of current non-contact examine the electrography, in case the response sheetmetal of nib became invalid, will produce the alert problem of wrong report is solved, normally reliably provide the self-checking function to whole induction loop, solved the potential safety hazard of non-contact AC test electrography on the market, the circuit is simple, reliable and stable.
Description
Technical Field
The utility model relates to an exchange and examine the electrography circuit field, especially relate to an exchange and examine electrography trouble self-checking circuit.
Background
The head of the traditional test pencil is mostly a naked metal pencil head, and the tail is a metal contact. When the test pencil is used, the metal pen point is directly connected with the electric wire to be tested, a tester touches the metal at the tail part of the test pencil by hands, a small amount of current flows through the test pencil from the electric wire to be tested, and the tester goes to the ground. At this time, if the test pencil fails, the tester may be directly connected to the electric wire, which may cause danger to personnel.
The existing electricity detection pen is improved, all circuits including the metal induction sheet are wrapped in the plastic shell, and alternating current is detected by utilizing the principle of an induction electric field. The human body is not contacted with the electric wire any more, so that the non-contact electricity detection is realized. But this technique also presents safety concerns. When the metal induction sheet in the shell is welded insecurely or is disconnected due to other reasons, the circuit cannot obtain an alternating current signal correctly, the test pencil can be used for false alarm, and personnel danger can be caused.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an exchange and examine electrography trouble self-checking circuit to solve current non-contact and examine the electrography, in case the response sheetmetal of nib became invalid, will produce the alert problem of wrong report, normally reliably provide the self-checking function to whole induction loop, solved non-contact on the market and exchanged the potential safety hazard of examining the electrography, the circuit is simple, reliable and stable.
In order to achieve the above purpose, the utility model adopts the following scheme:
the utility model provides an exchange and examine test pencil trouble self-checking circuit, includes response sheetmetal, sensing signal input circuit, fault detection input circuit, singlechip, the response sheetmetal has two welding pins, including pin a, pin b, pin a with the port P1 of singlechip is connected and constitutes sensing signal input circuit, pin b through intermediate junction terminal c with the port P2 of singlechip is connected and constitutes fault detection input circuit.
The utility model provides a exchanges test pencil trouble self-checking circuit, pin a with pin b, the certain distance is separated by.
The utility model provides an exchange and examine test pencil trouble self-checking circuit, be equipped with at least one resistance between pin b and the port P1 of singlechip.
The utility model provides an exchange and examine test pencil trouble self-checking circuit, pin a with be equipped with at least one resistance between the intermediate junction terminal c.
The utility model provides an exchange and examine test pencil trouble self-checking circuit, intermediate junction terminal c is through a resistance ground connection.
The utility model provides a self-checking circuit of alternating current test pencil trouble possesses following advantage and beneficial effect: the utility model discloses a to current non-contact examine electrography, metal response piece welding insecure in the casing, perhaps because other reasons break off, the response sheetmetal of nib became invalid, make the circuit unable correctly obtain alternating current signal, will make and examine electrography wrong report police, probably cause the dangerous problem of personnel, through setting up the response signal input circuit and fault detection input circuit and combining together with the singlechip, normally reliably provide the self-checking function to whole response circuit, the potential safety hazard of examining electrography is exchanged to non-contact on the market has been solved, the circuit is simple, and is stable and reliable.
Drawings
Fig. 1 is the circuit diagram of the utility model discloses alternating current test pencil trouble self-checking circuit.
The reference numbers in the figures denote:
1. an induction metal sheet; 2. an induction signal input circuit; 3. a fault detection input circuit; 4. and a single chip microcomputer.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, the fault self-checking circuit of the alternating current test pencil comprises an induction metal sheet 1, an induction signal input circuit 2, a fault detection input circuit 3 and a single chip microcomputer 4.
The model that the singlechip used is STM8S003F 3.
The induction metal sheet is provided with two welding pins which comprise a pin a and a pin b, and the pin a and the pin b are separated by a certain distance.
The pin a is connected with a port P1 of the single chip microcomputer to form the induction signal input circuit 2, and the pin b is connected with a port P2 of the single chip microcomputer through a middle connecting terminal c to form the fault detection input circuit 3.
The ports P1 and P2 can select any two pins of PD2, PD3, PD5, PD6 and PC 4.
The port P1 has two modes of operation, the first being an input mode and the second being an output mode.
Example 1:
when the port P1 is in the input mode, the pin a is connected with the port P1 of the single chip microcomputer to form the sensing signal input circuit 2.
The single chip microcomputer 4 can read the strength of the sensing signal through the port P1. When AC power is detected, an AC power alarm is given to the user.
At least one resistor is arranged between the pin b and the port P1 of the single chip microcomputer, and the resistance value of the resistor is 10K omega.
Example 2:
when the port P1 is in output mode, the pin b is connected with the P2 port of the single chip microcomputer through the middle connection terminal c to form the fault detection input circuit 3.
The port P1 outputs a fault test signal, which can output a high level or a specific pulse wave, and the single chip microcomputer 4 can read the fault test signal sent by the port P1 through the port P2. If the fault test signal sent by the port P1 can be completely received, the whole sensing circuit is complete and reliable. If the fault detection signal from the port P1 cannot be completely received, it indicates that the sensing circuit has a fault, and may be caused by a cold solder joint, a desoldering of the sensing metal sheet 1, or a resistance failure. At this point, an alarm is given to the user to indicate to the user that the instrument has been damaged.
At least one resistor is arranged between the pin a and the middle connecting terminal c, and the resistance value of the resistor is 20M omega.
The middle connecting terminal c is grounded through a resistor, and the resistance value of the resistor is 20M omega
The above embodiments are provided only for the purpose of illustration, and those skilled in the art can make various changes or modifications without departing from the spirit and scope of the present invention. Including but not limited to adding two pins to three or more pins of the sense metal sheet. Including but not limited to removing two pins and connecting the signal input circuit and the fault detection input circuit directly with both ends of the sensing metal sheet. Including but not limited to adding a single chip port to send and receive other auxiliary signals and the like as judgment. Including but not limited to slight variations in the arrangement and number of resistors. Therefore, all equivalent technical solutions should also belong to the scope of the present invention.
Claims (5)
1. The utility model provides an exchange and examine test pencil trouble self-checking circuit which characterized in that: including response sheetmetal (1), sensing signal input circuit (2), fault detection input circuit (3), singlechip (4), the response sheetmetal has two welding pin, including pin a, pin b, pin a with the port P1 of singlechip is connected and constitutes sensing signal input circuit (2), pin b through intermediate junction terminal c with the port P2 of singlechip is connected and constitutes fault detection input circuit (3).
2. The ac test pencil fault self-checking circuit according to claim 1, characterized in that: the pin a and the pin b are separated by a certain distance.
3. The ac test pencil fault self-checking circuit according to claim 1, characterized in that: at least one resistor is arranged between the pin b and the port P1 of the single chip microcomputer.
4. The ac test pencil fault self-checking circuit according to claim 1, characterized in that: at least one resistor is arranged between the pin a and the middle connecting terminal c.
5. The ac test pencil fault self-checking circuit according to claim 1, characterized in that: the intermediate connection terminal c is grounded via a resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120366695.0U CN214895488U (en) | 2021-02-07 | 2021-02-07 | Fault self-checking circuit of alternating current test pencil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120366695.0U CN214895488U (en) | 2021-02-07 | 2021-02-07 | Fault self-checking circuit of alternating current test pencil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214895488U true CN214895488U (en) | 2021-11-26 |
Family
ID=78857405
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120366695.0U Active CN214895488U (en) | 2021-02-07 | 2021-02-07 | Fault self-checking circuit of alternating current test pencil |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214895488U (en) |
-
2021
- 2021-02-07 CN CN202120366695.0U patent/CN214895488U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102859375B (en) | Protective switch with status detection | |
| CN110045208A (en) | It is a kind of for quickly detecting the fexible unit and method of electric connector | |
| CN113447885B (en) | Electric energy meter wrong wiring rapid detection circuit and device | |
| CN201600429U (en) | Electric leakage detector for electronic detonator network | |
| CN112858838A (en) | Cable fault positioning system and method | |
| CN201589815U (en) | Resistance test device | |
| CN214895488U (en) | Fault self-checking circuit of alternating current test pencil | |
| CN202119854U (en) | Pin welding state detection apparatus | |
| CN201122115Y (en) | Point type constant temperature-sensitive fire detector | |
| CN106556771B (en) | A kind of priming system circuitry self test survey method | |
| CN101119137A (en) | Multi-core coaxial cable component open-closed circuit detector and detecting method | |
| CN104198879A (en) | Polarity tester | |
| CN201060242Y (en) | Multi-core co-axial cable assembly opening-breaking circuit detector | |
| CN211348487U (en) | Power interface detection system | |
| CN209640434U (en) | A kind of equipment for the vehicle-mounted school VOBC line | |
| CN201378193Y (en) | Ground wire detecting device | |
| CN212083530U (en) | Improved high-voltage electroscope | |
| CN207689533U (en) | A kind of test pencil warning device | |
| CN114137363A (en) | Non-invasive AC/DC power flow direction detection device and judgment method | |
| CN207742273U (en) | A kind of electronic equipment fault locator | |
| CN210401531U (en) | Electric safety monitoring device | |
| CN208156121U (en) | A kind of check device of engine wiring harness short circuit | |
| CN216869884U (en) | Auxiliary device for calibrating electric contact pressure gauge | |
| CN109387693A (en) | DC electroscope | |
| CN110927563A (en) | Circuit board pad short circuit detection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |