CN2165450Y

CN2165450Y - Test pencil

Info

Publication number: CN2165450Y
Application number: CN 93221911
Authority: CN
Inventors: 韩亚林
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-08-16
Filing date: 1993-08-16
Publication date: 1994-05-18
Anticipated expiration: 2003-08-16

Abstract

The utility model relates to a test pencil which can emit light flickeringly. A diode and a capacitor are added in the test pencil which is composed of the existing insulating outer shell, a test contact head, a current-limiting resistor, a neon tube and a hand-contact electrode. The diode is electrically connected between the current-limiting resistor and the neon tube. Both ends of the capacitor are electrically connected with both ends of the neon tube respectively. The test contact head is contacted with a tested object, and the hand of a person contacts the hand-contact electrode. When the tested object corresponding to the earth ground has higher voltage, the neon tube generates more conspicuous dynamic flash light in order to test the electrified condition of the tested object at the bright point conveniently.

Description

Test pencil

The utility model relates to Electric tester, the especially test pencil that can glisten that a kind of instructed voltage exists.

Common test pencil structure is to be in series by test contact, current-limiting resistance, neon tube, metal spring and hand touched electrode.Test contact is contacted with measured object, staff contact hand touched electrode, when measured object had high voltage relative to the earth, neon tube was luminous, and the expression measured object is charged.But this static luminous being difficult for is found at the light place.

The purpose of this utility model provides a kind of test pencil, and its neon tube can be glisteningly luminous, more common test pencil static luminous more eye-catching.

The purpose of this utility model is achieved in that in insulation crust test contact, current-limiting resistance, diode, neon tube and hand touched electrode are electrically connected in proper order, and the two ends of a capacitor are electrically connected with the two ends of neon tube respectively.Like this, during test pencil work, along with the continuous charging and the discharge of capacitor, periodic change in voltage will appear in its two ends, and Bing Lian neon tube will be with flash of light frequently with it.The speed of capacitor charging/discharging is relevant with the capacitance of itself, and therefore, the big I that changes electric capacity changes the flashing rate of neon tube.

Owing to adopt such scheme, can make test pencil produce comparatively eye-catching dynamic flash of light, to measure the charged situation of measured object easily at the light place.It only increases a diode and a capacitor on the basis of common test pencil, simple in structure.

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is circuit theory diagrams of the present utility model.

Fig. 2 is the longitudinal profile structural map of an embodiment of the utility model.

Among the figure: 1. test contact 2. insulation crusts 3. springs 4. current-limiting resistances 5. sheet metals 6. pads 7. supports 8. diodes 9. capacitors 10. pads 11. sheet metals 12. pads 13. slits 14. sheet metals 15. neon tubes 16. support end points 17. hand touched electrode

In Fig. 1, test contact (1), current-limiting resistance (4), diode (8), neon tube (15) and hand touched electrode (17) series connection, capacitor (9) is parallel to the two ends of neon tube (15).Wherein, the resistance of current-limiting resistance (4) is 1～2 megaohm, and the capacitance of capacitor (9) is 0.1～0.33 microfarad, and withstand voltage is 160 volts, and diode (8) is the 2CP18 type.

With reference to Fig. 2, test contact (1) stretches into its cavity at insulation crust (2) one ends, contacts with spring (3), and an end of current-limiting resistance (4) contacts with spring (3), and the other end is resisted against on the sheet metal (5).It is moulding in the melt support (7) of string shape that the two ends of two rectangle sheet metals (5) and (11) embed two xsects respectively, and fold forms pad (6) and (10).The end of narrow sheet metal (14) being close to support (7) outside and having favorable elasticity is by slit (13) twice bending, and at the inboard pad (12) that forms of support (7), the other end is located to broaden and formed a bending at support end points (16).The positive pole of diode (8) is welded on the pad (6), and negative pole is welded on the pad (10), and the bipod of capacitor (9) is welded on respectively on pad (10) and (12).Sheet metal (11) slightly is shorter than the length of neon tube (15) apart from the distance of support end points (16), to guarantee good contact the between sheet metal (11), neon tube (15), sheet metal (14) and hand touched electrode (17).

Claims

1, a kind of test pencil, form by insulation crust, test contact, current-limiting resistance, neon tube and hand touched electrode, it is characterized in that: the diode that has its two poles of the earth to be electrically connected with the two respectively between current-limiting resistance and the neon tube, the two ends of neon tube are electrically connected with the two ends of a capacitor respectively.

2, test pencil according to claim 1 is characterized in that diode and capacitor are contained between the two stands, and the bipod of the two poles of the earth of diode and capacitor all is welded on the pad that embeds on the interior sheet metal of support.