CN2226309Y

CN2226309Y - AC-DC polarity test pencil

Info

Publication number: CN2226309Y
Application number: CN 95231699
Authority: CN
Inventors: 陈洪义
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-07-14
Filing date: 1995-07-14
Publication date: 1996-05-01
Anticipated expiration: 2005-07-14

Abstract

The utility model provides an AC-DC polarity test pencil. The utility model has the main techniques that in an insulation casing, a testing contact is connected with a transistor and a diode passes through a current-limiting resistance; the transistor and the diode are connected with a battery and an electricity conductive screw through a red LED and a green LED. The utility model has the advantages the utility model can conveniently and accurately test the pole of the alternating current and the pole of the direct current and can quickly and accurately find the failure part through the judgment of the pole of the alternating current and the pole of the direct current, the structure is simple and the test range can be between 5 to 500 volts.

Description

Alternating current-direct current polarity electroscope

The utility model relates to the Electric tester that a kind of test voltage exists, the particularly a kind of Electric tester that can relatively test combined-voltage and "+", "-" polarity.

At present, the luminous electroscope of the neon tube of use is inaccurate, not obvious to measuring earth-free direct supply "+" "-" polarity.In addition, to 100 volts of following combined-voltages, because the display effect of neon tube is poor, phenomenon such as can occur not working or brightness is not obvious.

The purpose of this utility model is for a kind of alternating current-direct current polarity electroscope is provided, can show automatically significantly that charged position over the ground is direct current or exchanges, be direct current "+" utmost point, still "-" utmost point, simultaneously, the 100 volts of following combined-voltage problems of measuring have been solved.

The purpose of this utility model is achieved in that measuring contacts links to each other with diode with triode by current-limiting resistance in insulation shell, and triode links to each other with battery and contact screw by red and green luminous diode with diode.Constitute alternating current-direct current polarity electroscope.When tested position was alternating voltage, alternating current was added to electroscope by test contact, touched the contact screw formation loop of electroscope again through the finger of test person.Red and green luminous diode is simultaneously bright, represents that tested position is an alternating voltage, and Red LED1 is bright, represents that tested position is DC voltage "+" utmost point, and red pipe does not work, and green Guan Liang represents that tested position is DC voltage "-" utmost point.The purpose of the combined-voltages below reaching test alternating current-direct current "+", "-" utmost point and measuring 100 volts.

Owing to adopt such scheme, can make things convenient for, test accurately combined-voltage polarity, can find the position of fault quickly and accurately by the judgement of alternating current-direct current polarity, simple in structure, test specification can be at 5-500 volts.

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

It on the figure structural drawing of the present utility model

Fig. 2 is circuit theory diagrams of the present utility model

Fig. 3 is a user mode reference diagram of the present utility model

By on the figure as can be known, measuring contacts 1 is housed in insulation crust 2, measuring contacts 1 is by current-limiting resistance R and triode B ₁With diode D ₁Link to each other triode B ₁With diode D ₁By red and green luminous diode G ₁, G ₂With battery E and triode B ₂With diode D ₂Link to each other, by metal emit 3, spring 4 links to each other with contact screw 5.

As shown in Figure 2, when tested position was alternating voltage, alternating current was added to electroscope by test contact 1, touched the contact screw 5 formation loops of electroscope again through the finger of test person.When alternating voltage was positive half cycle "+", electric current was by test contact 1---current-limiting resistance R---triode B ₁Base stage---triode B ₁Emitter---diode D ₂---contact screw 5---staff forms the loop.Therefore, diode B ₁Conducting, and triode B ₂End diode D ₁End, because triode B ₁Conducting, the positive pole of battery E---Red LED1 G ₁---triode B ₁Collector---triode B ₁The negative pole of emitter battery E form the loop.Red LED1 G then ₁Bright, triode B ₂End green light emitting diode G ₂Do not work.In like manner, when alternating voltage was negative half period "-", electric current was by test contact 1---current-limiting resistance R---diode D ₁Triode B ₂Emitter triode B ₂Base stage contact screw 5---staff forms the loop.So triode B ₂Conducting, and triode B ₁End diode D ₂End.Because triode B ₂Conducting, the positive pole of battery E---green LED G ₂Triode B ₂Collector triode B ₂Emitter---the negative pole of battery E, form loop, then green LED G ₂Bright, triode B ₁End red light emitting diodes G ₁Do not work, like this when the voltage at tested position when exchanging, red light emitting diodes G ₁With green LED G ₂Simultaneously bright, when the voltage at tested position is direct current "+", red light emitting diodes G ₁Bright, green LED G ₂Do not work.When the voltage at tested position is direct current "-", red light emitting diodes G ₁Do not work green LED G ₂Bright.

As shown in Figure 3, "+" of its electric loop, "-" extremely exist insulation resistance R+, R-to the grounded part of its electric equipment in the straight-flow system, (R+ is "+" polar circuit insulation resistance over the ground, R-is "-" polar circuit insulation resistance over the ground), the straight-flow system circuit is many more, and the numerical value of its insulation resistance R+, R-is just more little.During test, "-" utmost point of the shell of a hand electric shock device or hardware (promptly) circuit is by electroscope, through human body, through ground, "+" utmost point that arrives circuit through "+" utmost point insulation resistance R+ forms the loop, like this, makes the green pipe of electroscope luminous, thereby, determine that tested position is "-" utmost point of circuit, in like manner, "-" utmost point insulation resistance R-by circuit during test "+" polar circuit forms the loop, make the red pipe of electroscope luminous, determine that tested position is "+" utmost point of circuit.This point obtains just testing in practice, works very well, and for the less motor excitation loop of independent straight-flow system, the utility model also can reflect circuit polarity over the ground exactly, and the neon tube electroscope is then surveyed to be come out.

Claims

1, a kind of alternating current-direct current polarity electroscope, it is characterized in that: measuring contacts links to each other with diode with triode by current-limiting resistance in insulation shell, and triode links to each other with contact screw with battery by red and green luminous diode with diode.