Test pencil and self-checking use method thereof

Abstract

The invention relates to the technical field of test pencils, in particular to a test pencil and a self-checking use method thereof. Comprising a pen body, a power supply assembly, an electricity testing circuit assembly for testing whether an electricity-tested object is electrified, an electricity testing circuit detection assembly for testing whether the electricity testing circuit assembly is intact, and a contact detection assembly for testing whether the electricity testing pen is in good contact with the conductive surface of the electricity-tested object. Whether the electricity testing result is valid or not is judged by judging whether the test pencil is in contact with the conductive surface of the electricity-tested object or not; the three-step electricity testing method is automatically realized, and whether the electricity testing result is effective or not is judged by judging whether the electricity testing circuit assembly of the test pencil is intact or not before and after electricity testing. Therefore, the possibility that the electrified tested object is misjudged to be non-electrified due to poor contact or the fault of the test pencil is effectively solved, the correctness of electricity testing is ensured, the potential safety hazard is avoided, and the working efficiency of electricity testing is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of test pens, and in particular to a test pen and a self-testing method thereof. Background Art

[0002] Electricity is essential for daily life and production. While it brings convenience, it also carries certain risks. When electrical equipment malfunctions, maintenance often takes place during a power outage. This requires a voltage tester to verify that there is no power before maintenance can be performed safely. Even when operating with power on, there are significant differences between operating with power on and without power off. If a power outage is mistakenly identified, live operation will not be performed. On-site electrical testing is directly related to operational safety, and misidentification is essential.

[0003] However, there is often light interference on site and the light is unclear. When testing electricity, it is easy for the metal contacts of the test pen to come into contact with non-metallic pollutants on the surface of the object being tested, affecting the test results. The charged object being tested may be mistakenly tested as uncharged, posing a safety hazard.

[0004] At the same time, since the test pen is easy to break and the test results are not completely accurate, a three-step test method is required for on-site testing. Although the test operation is complicated, it can ensure that the test result of the object being tested is correct and there is no electricity.

[0005] The standard steps of the three-step electrical test method are as follows:

[0006] First, before testing for electricity, use the tester to verify that it is in good condition on a powered device: connect the tester pen or tester to a known powered device to verify whether it can work normally and ensure that the test equipment is intact.

[0007] Test the electrical equipment to be tested: Use a good tester to test the input and output wires and the casing of the electrical equipment to confirm that there is no voltage on the equipment.

[0008] Finally, after verifying that there is no voltage, check the electroscope on a powered device again: connect the electroscope to a known powered device again to ensure that it still works normally, thereby verifying the integrity and accuracy of the electroscope.

[0009] Application scenarios and importance of the three-step electrical test method:

[0010] The three-step electrical test method is primarily used to ensure the safety of electrical equipment before maintenance or repair. By verifying the integrity and accuracy of the electroscope, it can help prevent accidents caused by energized equipment. This method is crucial in the power industry and other fields requiring electrical safety inspections, effectively ensuring worker safety and equipment operation.

[0011] To ensure that the test pen can correctly detect the power during the test, it is necessary to use the test pen to test the power supply before and after the test to determine whether the test pen is good or bad. Only when the test pen correctly indicates that there is power in these two checks and the object being tested has no power will the test result be valid. This process increases the number of test steps and reduces the efficiency of the test.

[0012] What's worse, many people fail to strictly follow the three-step electrical testing method when testing electricity. Due to the damage of the test pen, they fail to discover it in time, resulting in the energized object being mistakenly considered to be de-energized, posing a safety hazard. Summary of the Invention

[0013] In view of the fact that there are many interferences in the above-mentioned existing on-site electrical testing, which affect the testing: due to light interference and unclear light, it is easy for the metal contacts of the test pen to come into contact with non-metallic contaminants on the surface of the tested object during on-site testing, affecting the test results. In order to ensure that the test pen can correctly test the electricity during the test process, the present invention is proposed.

[0014] Therefore, the present invention aims to provide a test pencil.

[0015] In order to solve the above technical problems, the present invention provides the following technical solutions: a test pencil, comprising:

[0016] Pen body;

[0017] Power supply components;

[0018] An electrical testing circuit component that checks whether the object being tested is energized;

[0019] A test circuit detection component for verifying that the test circuit component is intact; and

[0020] A contact detection component that verifies whether the test pencil is in good contact with the conductive surface of the object being tested.

[0021] As a preferred solution of a test pen of the present invention, the power supply component includes a contact detection power supply for providing power to the contact detection component and an analog power supply for providing circuit to the test circuit detection component, and both the contact detection power supply and the analog power supply are electrically suspended.

[0022] As a preferred embodiment of the test pen of the present invention, the test circuit assembly includes a metal test contact, a protective resistor, a neon bulb, a first spring, and a metal cap. During the test, a path is formed between the conductive surface of the object being tested and the metal test contact, the protective resistor, the neon bulb, the first spring, the metal cap, and the human body. If the neon bulb glows, it indicates that the object being tested is charged; if the neon bulb does not glow, it indicates that the object being tested is not charged.

[0023] As a preferred embodiment of an electric test pen of the present invention, the electric test circuit detection component includes a normally closed contact, which is connected to the electric test metal contact, the protective resistor, the neon bulb and the simulated power supply to form a path. If the neon bulb glows, it indicates that the electric test circuit component is intact; otherwise, it indicates that the electric test circuit component is faulty.

[0024] As a preferred embodiment of the present invention, a test pen for testing electricity is provided, wherein: the contact detection component includes a contact detection electrode, a second spring, and a contact detection indicator; the contact detection electrode is a slender metal strip, one side of which is inside the pen body; the second spring pushes the contact detection electrode to extend a certain distance from the tip of the pen when the test pen is not testing electricity; when the contact detection electrode and the metal contact of the test electricity are simultaneously contacted by the conductive surface of the test object, the contact detection indicator gives an indication of good contact.

[0025] As a preferred embodiment of the present invention, the contact detection indicator performs detection in voltage indication mode and current indication mode. In the voltage indication mode, the contact detection indicator detects the voltage between the contact detection electrode and the metal contact for electrical testing. If there is no voltage between the contact detection electrode and the metal contact for electrical testing, it indicates that the metal contact for electrical testing is in good contact with the object to be tested; otherwise, it indicates that there is no good contact. In the current indication mode, the contact detection indicator detects the current between the contact detection electrode and the metal contact for electrical testing. If there is current between the contact detection electrode and the metal contact for electrical testing, it indicates that the metal contact for electrical testing is in good contact with the object to be tested; otherwise, it indicates that there is no good contact.

[0026] As a preferred embodiment of the present invention, a test pen for an electrician is provided, wherein: the normally closed contact includes a first contact surface and a second contact surface, the first contact surface is fixed to the pen body, the second contact surface is fixed to the contact detection electrode of the contact detection component, and there is a non-metallic partition between the second contact surface and the contact detection electrode; when testing for electricity, the contact detection electrode is squeezed back a certain distance from the pen body by the object being tested, the normally closed contact is disconnected, and the analog power supply provided on the neon bulb is disconnected.

[0027] As a preferred embodiment of the test pen of the present invention, the pen body is an insulating material shell, including a pen tip, a shell, a transparent window, and a test pen inner cavity. The pen tip is fixed with a metal contact for testing electricity, the shell is provided with a test pen inner cavity, a metal cap is fixed to the tail end of the shell, and the transparent window is provided on the shell near the neon bulb and the contact detection indicator to facilitate observation by the operator.

[0028] A self-test method, comprising a test pencil, includes the following steps:

[0029] When testing electricity, the effectiveness of the test is determined by judging whether the test pen is in contact with the conductive surface of the object being tested. Specifically:

[0030] If the contact is good, the electrical test is effective;

[0031] If the contact is poor, the test result that the object being tested has no electricity will be invalid.

[0032] As a preferred embodiment of the self-test method of the present invention, the test circuit components are automatically monitored before and after the test, and the monitoring of the test circuit components is disconnected during the test. The three-step test method has the following specific steps:

[0033] Before testing electricity, use the automatic test pen to check whether the circuit components are intact;

[0034] When testing electricity, stop testing the test pen to check whether the circuit components are intact and let the test pen test electricity normally;

[0035] After the electrical test, the test pen will automatically test whether the circuit components are intact;

[0036] Before and after the electrical test, if the circuit components of the test pen are intact, the test result that the object being tested has no electricity is valid.

[0037] The beneficial effects of the present invention include: 1. Avoiding safety hazards: The validity of a voltage test result indicating no power on the object is determined by determining whether the voltage test pencil is in contact with the conductive surface of the object being tested. This automatically implements a three-step voltage test method, determining the validity of a voltage test result indicating no power on the object being tested by checking the integrity of the voltage test pencil's circuit components before and after the test. This effectively eliminates the possibility of misjudging a live object as no power due to poor contact or a faulty voltage test pencil, ensuring accurate voltage testing and avoiding safety hazards.

[0038] 2. Improve the efficiency of electrical testing: Automatically realize the three-step electrical testing method. The electrical testing process automatically realizes the normal operation of the test pen before and after the test, which improves the efficiency of electrical testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0040] Figure 1 This is a schematic diagram of the complete structure of an electric test pencil of the present invention;

[0041] Figure 2 This is a schematic diagram of the structure of an electric test pencil of the present invention that has anti-field interference capabilities;

[0042] Figure 3 A schematic diagram of a voltage indication mode in a voltage test pen and a self-test method thereof of the present invention;

[0043] Figure 4 The present invention is a schematic diagram of a current indication mode of a test pen and a self-test method thereof.

[0044] Figure numbers: 1. Pen body; 11. Pen tip; 12. Outer shell; 13. Transparent window; 14. Inner cavity of the test pen; 2. Power supply assembly; 21. Contact detection power supply; 22. Analog power supply; 3. Test circuit assembly; 31. Test metal contact; 32. Protection resistor; 33. Neon bulb; 34. First spring; 35. Metal cap; 4. Test circuit detection assembly; 41. Normally closed contact; 411. First contact surface; 412. Second contact surface; 5. Contact detection assembly; 51. Contact detection electrode; 52. Second spring; 53. Contact detection indicator; 531. Light-emitting diode; 532. First resistor of indicator; 533. Second resistor of indicator; 534. Third resistor of indicator; 535. Transistor. DETAILED DESCRIPTION

[0045] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0046] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0047] Secondly, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it constitute a separate or selective embodiment that is mutually exclusive with other embodiments.

[0048] Furthermore, the present invention is described in detail with reference to schematic diagrams. For ease of illustration, when describing the embodiments of the present invention, cross-sectional views illustrating device structures may be partially enlarged and not to scale. Furthermore, the schematic diagrams are merely illustrative and should not limit the scope of protection of the present invention. Furthermore, in actual production, the three-dimensional dimensions of length, width, and depth should be included.

[0049] Example 1

[0050] Reference Figure 1 - Figure 2, which is the first embodiment of the present invention, provides a test pen, which includes a pen body 1; a power supply component 2; a test circuit component 3 for detecting whether the tested object is charged; a test circuit detection component 4 for detecting whether the test circuit component 3 is intact; and a contact detection component 5 for detecting whether the test pen is in good contact with the conductive surface of the tested object.

[0051] Specifically, the power supply assembly 2 includes a contact detection power supply 21 for providing power to the contact detection assembly 5 and an analog power supply 22 for providing circuitry to the electrical circuit detection assembly 4. Both the contact detection power supply 21 and the analog power supply 22 are electrically suspended.

[0052] Furthermore, the electrical testing circuit assembly 3 includes an electrical testing metal contact 31, a protective resistor 32, a neon bulb 33, a first spring 34, and a metal cap 35. During electrical testing, a path is formed between the conductive surface of the object being tested and the electrical testing metal contact 31, the protective resistor 32, the neon bulb 33, the first spring 34, the metal cap 35, and the human body. If the neon bulb 33 glows, it indicates that the object being tested is charged; if the neon bulb 33 does not glow, it indicates that the object being tested is not charged.

[0053] Furthermore, the electrical detection circuit detection component 4 includes a normally closed contact 41, which is connected to the electrical detection metal contact 31, the protective resistor 32, the neon bulb 33, and the simulated power supply 22 to form a circuit. If the neon bulb 33 glows, it indicates that the electrical detection circuit component 3 is intact. Otherwise, it indicates that the electrical detection circuit component 3 is faulty. In addition, an inductive current shunt capacitor is added in parallel on both sides of the neon bulb 33 to eliminate the influence of inductive current on the neon bulb 33 that does not pose a harmful effect.

[0054] Among them, the normally closed contact 41 includes a first contact surface 411 and a second contact surface 412. The first contact surface 411 is fixed to the pen body 1, and the second contact surface 412 is fixed to the contact detection electrode 51 of the contact detection component 5. There is a non-metallic partition between the second contact surface 412 and the contact detection electrode 51; when testing the electricity, the contact detection electrode 51 is squeezed back into the pen body 1 for a distance by the object being tested, the normally closed contact 41 is disconnected, and the analog power supply 22 provided on the neon bulb 33 is disconnected.

[0055] Furthermore, the contact detection assembly 5 includes a contact detection electrode 51, a second spring 52, and a contact detection indicator 53. The contact detection electrode 51 is a slender metal strip, one side of which is inside the pen body 1. The second spring 52 pushes the contact detection electrode 51 out of the pen tip 11 for a certain distance when the test pen is not testing electricity. When the contact detection electrode 51 and the metal contact 31 of the test object are simultaneously in contact with the conductive surface of the test object, the contact detection indicator 53 sends a good contact indication.

[0056] Among them, the contact detection indicator 53 performs detection in voltage indication mode and current indication mode. In the voltage indication mode, the contact detection indicator 53 detects the voltage between the contact detection electrode 51 and the test metal contact 31. If there is no voltage between the contact detection electrode 51 and the test metal contact 31, it means that the test metal contact 31 is in good contact with the object being tested; otherwise, it means that there is no good contact. In the current indication mode, the contact detection indicator 53 detects the current between the contact detection electrode 51 and the test metal contact 31. If there is current between the contact detection electrode 51 and the test metal contact 31, it means that the test metal contact 31 is in good contact with the object being tested; otherwise, it means that there is no good contact.

[0057] Furthermore, the pen body 1 is an insulating material shell 12, including a pen tip 11, a shell 12, a transparent window 13, and a test pen inner cavity 14. The pen tip 11 is fixed with a metal test contact 31, and the test pen inner cavity 14 is provided in the shell 12. A metal cap 35 is fixed to the tail end of the shell 12. The transparent window 13 is set at the shell 12 near the neon bulb 33 and the contact detection indicator 53 to facilitate observation by the operator. A lighting lamp is also added to the pen tip 11 to provide lighting in front of the test pen during operation.

[0058] During operation, the operator touches the test pencil's metal contact 31 to the conductive surface of the object being tested. Simultaneously, the contact detection electrode 51 also contacts the object. When the object compresses the contact detection electrode 51, it retreats a distance into the test pencil body 1, disconnecting the normally closed contact 41 and the analog power supply 22, thereby stopping power to the test circuit assembly 4. At this point, the neon bulb 33 in the test circuit assembly 3 will illuminate or not, depending on whether the object is charged. If the neon bulb 33 illuminates, the object is charged; if it does not, it is not charged.

[0059] At the same time, the contact detection assembly 5 begins operating. The contact detection indicator 53 detects the voltage or current between the contact detection electrode 51 and the test metal contact 31 in voltage or current indication mode. If the contact detection indicator 53 detects no voltage or current between the contact detection electrode 51 and the test metal contact 31, it indicates that the test metal contact 31 is in good contact with the object being tested. Otherwise, it indicates poor contact. The contact detection indicator 53 will indicate whether the contact is good or not through an indicator light or a sound.

[0060] In addition, the induced current shunt capacitor eliminates the harmless induced current from affecting the neon bulb 33, ensuring the accuracy of the test results. The light at the tip 11 illuminates the front of the test pen during operation, making it easier for the operator to operate. Throughout the entire process, the pen body 1 is made of insulating material, ensuring the operator's safety.

[0061] Example 2

[0062] Reference Figure 1 - Figure 4 , which is a second embodiment of the present invention, provides a self-testing method, specifically including automatically monitoring the test circuit assembly 3 before and after the test, and disconnecting the monitoring of the test circuit assembly 3 during the test. The three-step test method specifically includes the following steps:

[0063] S1. Before testing electricity, use the test pen to automatically test whether the circuit component 3 is intact.

[0064] S2. When testing electricity, stop testing the test pen to see if the test circuit component 3 is intact and let the test pen test electricity normally. When testing electricity, determine whether the test is valid by judging whether the test pen is in contact with the conductive surface of the object being tested. Specifically, if the contact is good, the test is valid; if the contact is poor, the test result that the object being tested has no electricity is invalid.

[0065] S3. After the electrical test, the tester automatically tests whether the circuit component 3 is intact.

[0066] Wherein, before and after the electrical test, if the electrical test circuit assembly 3 of the test pen is intact, the electrical test result that the object being tested has no electricity is valid.

[0067] Among them, the test circuit component 3 for testing whether the tested object is charged, the test circuit detection component 4 for testing whether the test circuit component 3 is intact, and the contact detection component 5 for testing whether the test pen is in good contact with the conductive surface of the tested object can monitor whether the test metal contact 31 of the test pen is in good contact with the metal surface of the tested object during the test, automatically realize the three-step test method for testing, avoid the misjudgment of the tested object as having no power, possible safety hazards, and improve the efficiency of the test work.

[0068] Example 3

[0069] Reference Figure 1 - Figure 3 , which is the third embodiment of the present invention, provides a test pen and its self-testing method, which includes a contact detection indicator 53 detecting the current between the contact detection electrode 51 and the test metal contact 31 in the current indication mode. If there is current between the contact detection electrode 51 and the test metal contact 31, it means that the test metal contact 31 is in good contact with the object being tested; otherwise, it means that there is no good contact.

[0070] Specifically, the contact detection indicator 53 includes a circuit connected to the positive pole of the power supply to the second indicator resistor 533 and the third indicator resistor 534. The other end of the third indicator resistor 534 is connected to the contact detection electrode 51 and the base of the transistor 535. The other end of the second indicator resistor 533 is connected to the positive pole of the light-emitting diode 531. The negative pole of the light-emitting diode 531 is connected to the collector of the transistor 535. The emitter of the transistor 535 is connected to the negative pole of the power supply and the electrical detection metal contact 31.

[0071] The light emitting diode 531 selected in this circuit emits red light when powered on. When the light emitting diode 531 emits red light, it indicates poor contact; when it does not emit light, it indicates good contact.

[0072] Specifically: during the electrical test, if the electrical test metal contact 31 and the contact detection electrode 51 are not in good contact with the conductive surface of the object being tested, there is a potential difference between the electrical test metal contact 31 and the contact detection electrode 51, and the light-emitting diode 531 is turned on and emits red light; if the electrical test metal contact 31 and the contact detection electrode 51 are in good contact with the conductive surface of the object being tested, the voltage difference between the electrical test metal contact 31 and the contact detection electrode 51 is zero, and the light-emitting diode 531 is turned on and does not emit light.

[0073] Furthermore, the power provided by the contact detection power supply 21 to the contact detection component 5 is loaded on the contact detection indicator 53, the positive pole of the power supply line is connected to the indicator first resistor 532, the other end of the indicator first resistor 532 is connected to the positive pole of the light-emitting diode 531, the negative pole of the light-emitting diode 531 is connected to the contact detection electrode 51, and the negative pole of the power supply is connected to the electrical detection metal contact 31.

[0074] The light emitting diode 531 selected in this circuit emits green light when powered on. The green light of the light emitting diode 531 indicates good contact, and the absence of light indicates poor contact.

[0075] During the electrical test, if the electrical test metal contact 31 and the contact detection electrode 51 are not in good contact with the conductive surface of the object being tested, no current flows between the electrical test metal contact 31 and the contact detection electrode 51, and the light-emitting diode 531 does not emit light; if the electrical test metal contact 31 and the contact detection electrode 51 are in good contact with the conductive surface of the object being tested, current flows between the electrical test metal contact 31 and the contact detection electrode 51, and the light-emitting diode 531 is turned on and emits green light.

[0076] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A test pencil, characterized by: include, Pen body (1); Power supply assembly (2); An electrical testing circuit assembly (3) for testing whether the object being tested is charged; A test circuit detection component (4) for detecting whether the test circuit component is intact; and A contact detection component (5) is used to check whether the test pencil is in good contact with the conductive surface of the object being tested.

2. The voltage tester according to claim 1, characterized in that: The power supply component (2) comprises a contact detection power supply (21) for providing power to the contact detection component (5) and an analog power supply (22) for providing circuits to the electrical circuit detection component (4). Both the contact detection power supply (21) and the analog power supply (22) are electrically suspended.

3. The voltage tester according to claim 2, characterized in that: The electric detection circuit assembly (3) comprises an electric detection metal contact (31), a protective resistor (32), a neon bulb (33), a first spring (34), and a metal cap (35). During electric detection, a conductive surface of the object being detected forms a path with the electric detection metal contact (31), the protective resistor (32), the neon bulb (33), the first spring (34), the metal cap (35), and the human body. If the neon bulb (33) emits light, it indicates that the object being detected is charged, and if the neon bulb (33) does not emit light, it indicates that the object being detected is not charged.

4. The voltage tester according to claim 3, characterized in that: The electric detection circuit detection component (4) includes a normally closed contact (41), and the normally closed contact (41) is connected to the electric detection metal contact (31), the protective resistor (32), the neon bulb (33) and the simulated power supply (22) to form a path. If the neon bulb (33) is lit, it indicates that the electric detection circuit component (3) is intact, otherwise it indicates that the electric detection circuit component (3) is faulty.

5. The voltage tester according to claim 4, characterized in that: The contact detection assembly (5) comprises a contact detection electrode (51), a second spring (52), and a contact detection indicator (53). The contact detection electrode (51) is a slender metal strip, one side of which is inside the pen body (1). The second spring (52) pushes the contact detection electrode (51) to extend a certain distance from the pen tip (11) when the test pen is not testing electricity. When the contact detection electrode (51) and the metal contact (31) of the test pen are simultaneously in contact with the conductive surface of the test object, the contact detection indicator (53) sends a good contact indication.

6. The voltage tester according to claim 5, characterized in that: The contact detection indicator (53) performs detection in a voltage indication mode and a current indication mode. In the voltage indication mode, the contact detection indicator (53) detects the voltage between the contact detection electrode (51) and the metal contact (31) for testing electricity. If there is no voltage between the contact detection electrode (51) and the metal contact (31) for testing electricity, it indicates that the metal contact (31) for testing electricity is in good contact with the object being tested; otherwise, it indicates that there is no good contact. In the current indication mode, the contact detection indicator (53) detects the current between the contact detection electrode (51) and the metal contact (31) for testing electricity. If there is current between the contact detection electrode (51) and the metal contact (31) for testing electricity, it indicates that the metal contact (31) for testing electricity is in good contact with the object being tested; otherwise, it indicates that there is no good contact.

7. The voltage tester according to claim 6, characterized in that: The normally closed contact (41) comprises a first contact surface (411) and a second contact surface (412), wherein the first contact surface (411) is fixed to the pen body (1), and the second contact surface (412) is fixed to the contact detection electrode (51) of the contact detection component (5), and a non-metallic partition is provided between the second contact surface (412) and the contact detection electrode (51); when testing electricity, the contact detection electrode (51) is squeezed by the object being tested and retracted a distance from the pen body (1), the normally closed contact (41) is disconnected, and the analog power supply (22) provided on the neon bulb (33) is disconnected.

8. The voltage tester according to claim 7, characterized in that: The pen body (1) is an insulating material shell, comprising a pen tip (11), a shell (12), a transparent window (13), and an electrician's pen inner cavity (14); the pen tip (11) is fixed with an electrician's metal contact (31); the shell (12) is provided with an electrician's pen inner cavity (14); a metal cap (35) is fixed to the tail end of the shell (12); the transparent window (13) is arranged at the shell (12) near the neon bulb (33) and the contact detection indicator (53), so as to facilitate observation by operators.

9. A self-test method, characterized by: The test pencil according to any one of claims 1 to 8, comprising: When testing electricity, the effectiveness of the test is determined by judging whether the test pen is in contact with the conductive surface of the object being tested. Specifically: If the contact is good, the electrical test is effective; If the contact is poor, the test result that the object being tested has no electricity will be invalid.

10. A self-test method, characterized by: The test pencil according to any one of claims 1 to 8, comprising: The electric test circuit component (3) is automatically monitored before and after the electric test, and the monitoring of the electric test circuit component (3) is disconnected during the electric test. The three-step electric test method has the following specific steps: Before testing electricity, automatically test the circuit component (3) with the test pen to see if it is intact; When testing electricity, stop testing the test pen to check whether the circuit component (3) is intact and allow the test pen to test electricity normally; After the electrical test, the test pen automatically tests whether the electrical circuit component (3) is intact; Before and after the electrical test, if the electrical test circuit assembly (3) of the test pen is intact, the electrical test result that the object being tested has no electricity is valid.

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