CN201754165U

CN201754165U - Flashing neon-electroscope

Info

Publication number: CN201754165U
Application number: CN2010202890147U
Authority: CN
Inventors: 伍水生
Original assignee: Hengyang Fengshun Automobile Axle Co Ltd
Current assignee: Hengyang Fengshun Automobile Axle Co Ltd
Priority date: 2010-08-07
Filing date: 2010-08-07
Publication date: 2011-03-02
Anticipated expiration: 2020-08-07

Abstract

A flashing neon-electroscope, comprising an outer casing, which is characterized in that: the test circuit comprises the core components of a field effect tube, a triode and an LBD. When tested, the detecting head may not directly contact with the power supply, has good safety, displays by the flashing of the LBD LED, is convenient for observing, is exactly identified, is specifically suitable for working under strong light or in field condition, and has a wide range of application.

Description

A kind of flashing type test pencil

Technical field

The utility model provides a kind of circuit test instrument, particularly a kind of flashing type test pencil.

Background technology

At present, the testing tool that uses when circuit is carried out easily-testing is commonly the luminous test pencil of Contact Sensor neon tube, must directly contact with power supply during test, when circuit is charged by the continuous luminous demonstration of neon tube, occur easily not seeing under high light or during field work and cause erroneous judgement, poor safety performance.

Summary of the invention

The purpose of this utility model is in order to overcome above-mentioned weak point, and provide a kind of and discern accurately, flashing type test pencil that security performance is good.

The purpose of this utility model is achieved in that a kind of flashing type test pencil, comprise shell, the test circuit that it is characterized in that it is with field effect transistor BG1, triode BG2, BG3, LED is that core is formed, wherein the BG1 grid connects the detecting head of test pencil, the BG1 drain electrode also connects the BG2 base stage, resistance R 1, R2 one end, the BG2 collector also connects the BG3 base stage, resistance R 3 one ends, BG2 emitter and connecting resistance R4 one end, capacitor C negative pole, the LED negative pole, BG3 emitter and connecting resistance R5 one end, the C positive pole, anodal K switch one end that connects of direct supply E, the K other end, the LED positive pole, R5, R3, the R1 other end also connects, the BG1 source electrode, R2, the R4 other end, the BG3 collector, the E negative pole also connects, and each element is installed in the enclosure, on the panel.

The utility model during test, is connected K switch owing to adopt above design, during when the detecting head contact or near circuit-under-test, not charged as circuit-under-test, conducting between then BG1 drain electrode, the source electrode, BG2 ends, and is not worked by the squegger that BG2, BG3 form, and LED is not luminous; Charged as circuit-under-test, after BG1 grid input signal makes the resistance between drain electrode, the source electrode increase to certain resistance, BG2, BG3 conducting, capacitor C is former to be discharged through emitter, the collector of BG3 through the electric energy that R4, R5 filled, the positive pole that is equivalent to C is communicated with direct supply E negative pole, be that electric energy that C stores is connected with E and powered to LED, make LED luminous, as long as input electrical signal exists, the charge and discharge process of C just makes the R4 two ends variation of voltage height occur, cause BG2 to repeat by, conducting, the driving LED flicker is luminous.Detecting head can directly not contact with power supply, and security performance is good, is shown by the LED flicker, is convenient to observe, and identification accurately is particularly suitable under the high light and operation under the field condition, and is applied widely.

Description of drawings

Fig. 1 is the utility model structural representation;

Fig. 2 is the utility model test circuit circuit diagram.

Embodiment

Now illustrated embodiment is made detailed description to the utility model in conjunction with the accompanying drawings.

As shown in Figure 2, test circuit is with field effect transistor BG1, triode BG2, BG3, LED is that core is formed, wherein the BG1 grid connects the detecting head of test pencil, the BG1 drain electrode also connects the BG2 base stage, resistance R 1, R2 one end, the BG2 collector also connects the BG3 base stage, resistance R 3 one ends, BG2 emitter and connecting resistance R4 one end, capacitor C negative pole, the LED negative pole, BG3 emitter and connecting resistance R5 one end, the C positive pole, anodal K switch one end that connects of direct supply E, the K other end, the LED positive pole, R5, R3, the R1 other end also connects, the BG1 source electrode, R2, the R4 other end, the BG3 collector, the E negative pole also connects, and each element is installed in the enclosure, on the panel.

Claims

1. flashing type test pencil, comprise shell, the test circuit that it is characterized in that it is with field effect transistor BG1, triode BG2, BG3, LED is that core is formed, wherein the BG1 grid connects the detecting head of test pencil, the BG1 drain electrode also connects the BG2 base stage, resistance R 1, R2 one end, the BG2 collector also connects the BG3 base stage, resistance R 3 one ends, BG2 emitter and connecting resistance R4 one end, capacitor C negative pole, the LED negative pole, BG3 emitter and connecting resistance R5 one end, the C positive pole, anodal K switch one end that connects of direct supply E, the K other end, the LED positive pole, R5, R3, the R1 other end also connects, the BG1 source electrode, R2, the R4 other end, the BG3 collector, the E negative pole also connects, and each element is installed in the enclosure, on the panel.