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Electric test pen capable of judging alternating current and direct current

A technology of alternating and direct current, test pen, applied in the direction of indicating the existence of current/voltage, etc., can solve the problem of not being able to identify the charged properties of the object to be measured, and not being able to distinguish between direct current and alternating current.

Inactive Publication Date: 2012-05-09
张海艇
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The currently used electric test pen can easily detect whether the measured object has electricity, but there is still a shortcoming that it cannot identify the electrified property of the measured object well, that is, it cannot distinguish whether the measured electricity is DC or AC. of

Method used

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  • Electric test pen capable of judging alternating current and direct current
  • Electric test pen capable of judging alternating current and direct current

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Experimental program
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Effect test

Embodiment Construction

[0011] Embodiments of the present invention will be described in detail with reference to accompanying drawings: by detection circuit 3, alternating current display circuit 5, direct current display circuit 8, test pen holder 1, shell 2, battery 10 form a test pen that can distinguish between alternating and direct currents, in detection circuit 3 Contains a field effect transistor 14, the gate of the field effect transistor 14 is connected to the test penholder 1, its drain is connected to the positive pole of the battery 10 through a resistor 4, its source is connected to the negative pole of the battery 10, and the gate of the field effect transistor 14 When the voltage transmitted from the test pen holder 1 is not received, its drain is at low level, and when the gate receives the voltage transmitted from the test pen holder, its drain is at high level.

[0012] The AC display circuit 3 contains an NPN triode 6, and a capacitor 13 for blocking DC and AC is connected in seri...

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Abstract

The invention relates to an electric test pen capable of judging alternating current and direct current, which consists of a detecting circuit, an alternating-current display circuit, a direct-current display circuit, a test pen holder, an outer shell and a battery, wherein the detecting circuit comprises a field-effect pipe, the grid electrode of the field-effect pipe is connected with the test pen holder, the drain electrode of the field-effect pipe is connected with the positive pole of the battery by a resistor, the alternating-current display circuit comprises an NPN (negative-positive-negative) type triode, a capacitor which is used for separating direct current and leading alternating current to pass through, and a red light-emitting diode, the direct-current display circuit comprises an NPN type triode, an inductor for separating alternating current and leading direct current to pass through, and a green light-emitting diode, when tested electricity is alternating current, the current passes a capacitor and conducts the NPN type triode in the alternating current display circuit, a red light-emitting diode is lightened, when the tested electricity is direct current, the current passes the inductor and conducts the NPN type triode in the direct current display circuit, the green light-emitting diode is lightened, and the electric test pen can well distinguish the attributes of alternating current and direct current of the tested electricity.

Description

Technical field [0001] The invention relates to an electric test pencil, in particular to an electric test pencil capable of distinguishing AC and DC. Background technique [0002] The currently used electric test pen can easily detect whether the measured object has electricity, but there is still a shortcoming that the charged property of the measured object cannot be well identified, that is, it cannot be well distinguished whether the measured electricity is DC or AC. of. Contents of the invention [0003] The purpose of the present invention is to provide a kind of test pencil that can distinguish between alternating and direct currents. For achieving the above-mentioned purpose, the technical solution adopted by the present invention to solve technical problems is: by detection circuit, alternating current display circuit, direct current display circuit, test pen holder, shell, The battery forms a test pen capable of distinguishing AC and DC, and the detection circu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/145G01R19/15
Inventor 张海艇
Owner 张海艇
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