CN217639260U - Test pencil - Google Patents

Abstract

A test pencil comprises an insulating shell, a test contact, a neon tube and an electrode, wherein the test contact is arranged on the insulating shell, the surface of the insulating shell is provided with the electrode, and the insulating shell is internally provided with the neon tube. The utility model relates to a test pencil has increased partly shunt resistance for shunt resistance one end also inserts the circuit, and not only can judge whether electrified can also judge whether be the dangerous voltage that has potential threat to the human body through the contact of human body and electrode, improves the safety in utilization.

Description

Test pencil

[ technical field ] A

The utility model relates to an electronic product testing tool especially relates to a can discern safe and dangerous voltage's test pencil.

[ background of the invention ]

At present, the known test pencil structure is formed by connecting a test contact, a current-limiting resistor, a neon tube, a metal spring and a hand contact electrode in series. The test contact is contacted with the tested object, the hand touches the hand touch electrode, when the tested object has relatively high voltage, the neon tube is lighted, which shows that the tested object is electrified. However, the metal housings of many electrical appliances do not carry a shock voltage that is dangerous to the human body, and only indicate that the distributed capacitance and/or the normal resistance induce a potential to ignite the neon tube. The general test pencil can not distinguish dangerous electric shock voltage and non-dangerous induced potential, which causes difficulty in detecting electric leakage and is easy to cause misjudgment.

[ summary of the invention ]

The utility model discloses a to current problem, provide a can discern safe voltage and dangerous voltage's test pencil, increased partly shunt resistance for shunt resistance one end also inserts the circuit, and not only can judge whether electrified can also judge whether be the dangerous voltage that has potential threat to the human body through the contact of human body and electrode, improves the safety in utilization.

The utility model relates to a test pencil, including insulating casing, test contact, neon tube and electrode, the test contact sets up on insulating casing, has the electrode on the insulating casing surface and is equipped with the neon tube in the insulating casing, and its characterized in that is equipped with the electrode on resistance, neon tube, spring and the insulating casing in the insulating casing, and has set up a shunt resistance circuit parallelly connected with this resistance, neon tube and spring in insulating casing.

The two parallel connection circuits are a first connection circuit and a second connection circuit respectively, and the second connection circuit is a shunt resistance circuit comprising a shunt resistance.

The first connecting circuit is connected with a current-limiting resistor, a light-emitting neon tube and a first spring in series in sequence and finally connected with a hand-touch electrode on the insulator shell.

The second communication circuit is connected with a shunt resistor and a second spring in series in sequence and finally connected to the recognition electrode on the insulator shell.

The insulating shell has a transparent structural region in the middle, and the neon tube arranged in the insulating shell corresponds to the transparent structural region.

The utility model relates to a test pencil has increased partly shunt resistance for shunt resistance one end also inserts the circuit, and not only can judge whether electrified can also judge whether be the dangerous voltage that has potential threat to the human body through the contact of human body and electrode, improves the safety in utilization.

[ description of the drawings ]

Fig. 1 is a schematic structural view of a test pencil according to the present invention;

wherein: 10. a housing; 11. a current limiting resistor; 12. a first spring; 13. a hand-touch electrode; 14. a transparent structure region; 20. testing the contact; 21. a shunt resistor; 22. a second spring; 23. a recognition electrode; 30. a neon tube; 100. a first connection circuit; 200. a second pass circuit;

[ detailed description ] A

The invention will be described in detail with reference to the drawings and embodiments, examples of which are illustrated in the drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the present invention.

Referring to fig. 1, there is shown a test pencil, which comprises an insulating casing 10, a test contact 20, a neon tube 30 and electrodes, wherein the test contact 20 is arranged on the insulating casing 10, the electrodes are arranged on the surface of the insulating casing 10, and the neon tube 30 is arranged in the insulating casing 10, characterized in that a resistor, the neon tube 30, a spring and the electrodes on the insulating casing 10 are arranged in the insulating casing 10, and a shunt resistor circuit connected with the resistor, the neon tube and the spring in parallel is arranged in the insulating casing 10.

The two parallel communication circuits are the first communication circuit 100 and the second communication circuit 200, and the second communication circuit 200 is a shunt resistance circuit including the shunt resistance 21.

The first connecting circuit 100 is connected in series with a current limiting resistor 11, a light emitting neon tube 30 and a first spring 12 in sequence, and finally connected to a hand contact electrode 13 on the insulator housing 10.

The second communication circuit 200 is connected in series with a shunt resistor 21 and a second spring 22 in this order, and is finally connected to a recognition electrode 23 on the insulator housing.

The insulating housing 10 has a transparent structural region 14 in the middle, and neon tubes 30 disposed within the insulating housing 10 correspond to the transparent structural region 14. The transparent structure region 14 is changed to make the neon tube light-emitting condition be smoothly observed by user so as to judge that whether it is charged or not or whether it is charged with dangerous voltage or not by means of that the neon tube is lighted or not.

When the test pencil is used, the test contact 20 is used for contacting an electrical appliance, and a human hand holds the test pencil part, when the human hand only contacts the hand touch electrode 13, the test contact 20, the current-limiting resistor 11, the neon tube 30 and the hand touch electrode 13 form a loop, and under the condition that the human hand only contacts the hand touch electrode 13, the neon tube 30 is lighted to indicate that a detected object is electrified.

At this moment, we can use the test pencil to further test, namely whether the apparatus has dangerous voltage, when the hand touches the hand touch electrode 13 and the identification electrode 23 at the same time, if the measured object does not have dangerous voltage, when there is no dangerous potential, because the internal resistance of the potential source is very large, thus has reduced the charged potential of the measured object, the neon tube does not light, if the measured object has dangerous electric shock voltage, because its internal resistance is small, insert the shunt resistor 21 and hardly reduce the charged potential of the measured object, the neon tube 30 keeps light, indicate the measured object has dangerous voltage, thus achieve the goal of distinguishing safe and dangerous voltage.

The utility model relates to a test pencil has increased partly shunt resistance for shunt resistance one end also inserts the circuit, and not only can judge whether electrified can also judge whether be the dangerous voltage that has potential threat to the human body through the contact of human body and electrode, improves the safety in utilization.

The above description is only for the preferred embodiment of the present invention, and the present invention is not limited to the above description, and although the present invention is disclosed in the preferred embodiment, it is not limited to the above description, and any person skilled in the art can make modifications or changes equivalent to the above disclosed technical content without departing from the technical scope of the present invention.

Claims (5)

1. A test pencil comprises an insulating shell, a test contact, a neon tube and an electrode, wherein the test contact is arranged on the insulating shell, the surface of the insulating shell is provided with the electrode, and the insulating shell is internally provided with the neon tube.

2. The test pencil of claim 1 wherein the two parallel circuits are a first circuit and a second circuit, and wherein the second circuit is a shunt resistor circuit including a shunt resistor.

3. The test pencil of claim 2 wherein the first connecting circuit is serially connected with a current limiting resistor, a neon bulb and a first spring in sequence, and is finally connected to the hand contact electrode on the insulator housing.

4. The test pencil of claim 2, wherein the second connection circuit is connected in series with a shunt resistor, a second spring, and finally to the identification electrode on the insulator housing.

5. The test pencil of claim 1 wherein the insulating housing has a transparent structural region in the middle thereof and the neon tube disposed within the insulating housing corresponds to the transparent structural region.

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