CN2137362Y

CN2137362Y - Multifunctional test pen

Info

Publication number: CN2137362Y
Application number: CN 92216769
Authority: CN
Inventors: 尚庆祥
Original assignee: Dandong Relay Factory First Branch Factory
Current assignee: Dandong Relay Factory First Branch Factory
Priority date: 1992-08-15
Filing date: 1992-08-15
Publication date: 1993-06-30
Anticipated expiration: 2002-08-15

Abstract

The utility model relates to a novel measuring pen, comprising a plastic shell, a measuring contact, a current-limited resistor, a hand-touch electrode and a combined dynatron amplifying and acousto-optic displaying circuit. The utility model is characterized in that through the measuring pen, and one or two pressure-dividing resistor R2 or R3 branch, and the selection on the resistance value of R2 and R3, the measuring pen has the functions of distinguishing dangerous voltage, and judging whether a high voltage measurement, a measured lead and a transistor powered-on or off. Besides, the utility model has the advantages of multifunction and flexible and easy use.

Description

The multifunctional testing pen

The utility model relates to a kind of instructed voltage and exist, and the Electric tester, the particularly test pencil of forming by plastic casing, test contact, current-limiting resistance, driving sound and light show circuit and hand touched electrode of energy measurement circuit break-make.

Electric tester has various structure at present, the more CN89211746.x patent disclosure of kind a kind of " multifunctional testing pen " its be exactly to form by plastic casing, test contact, current-limiting resistance, driving sound and light show circuit and hand touched electrode, driving sound and light show circuit is to be made of compound transistor amplifying circuit and load cross-over connection both ends of power thereof.Test contact is joined by current-limiting resistance and compound amplifying triode base stage, and hand touched electrode and compound amplifying triode collector join.When test contact contacts with tested metallic object, when staff contacts with the hand touched electrode, just can indicate metallic object whether charged, when measured object has high voltage for the earth, drive display circuit work, the light emitting diode starter represents that tested metallic object is charged.When test contact and plain conductor one end in contact, a hand of staff contacts with this lead other end, when the another hand contacts with the hand touched electrode, just can indicate whether plain conductor is conducting on the other hand.Light emitting diode starter when being conducting, otherwise starter not, when but measured object is not with the adventurous electric shock voltage of people, with when ambient electromagnetic field is strong, also can make the light emitting diode starter in the test pencil, can not distinguish dangerous voltage when therefore its examination is electric, easy misoperation when it surveys break-make causes difficulty and brings wrong judgement to test job

The purpose of this utility model provides a kind of multifunctional testing electroprobe, it can be distinguished tested metallic object easily and whether have dangerous voltage, and the induced potential that still is safe from danger can also high voltage testing, be whether sensing has high-voltage charged body, the accurate break-make of test lead etc.

The utility model is that the technical solution of finishing above-mentioned task employing is, one or two divider resistance branch roads are set in test pencil, divider resistance one end and compound amplifying triode base stage are joined, the other end be with this/two divider resistance branch roads have by/be communicated with, disconnected joining of two kinds of duties respectively with power supply ground.When the divider resistance branch road disconnects, finish the former examination electric work energy of not distinguishing dangerous voltage; With when ambient electromagnetic field is strong, sensing has high-voltage charged body, promptly finishes the high voltage testing function; When inserting its resistance value much smaller than the divider resistance branch road of current-limiting resistance resistance, be used for examination, when tested metallic object voltage is low, because divider resistance has reduced the base potential of compound amplifying triode, can not reach the required current potential that starts to work, then amplifying circuit is not worked, and luminous original paper is starter not.Otherwise starter then, thereby reach the differentiation safe or dangerous voltage, one/another its resistance value is bigger when inserting, during the divider resistance branch road of several megaohms, identical with above-mentioned principle, its influence that reduces ambient electromagnetic field reduces the induced potential of compound amplifying triode base stage, transfers to from the electroscope function of sensing high voltage electrified body and makes lead on off test function.

Above-mentioned divider resistance branch road can two all be provided with, and is switched, also one can be set by multi-gear switch.

Below in conjunction with accompanying drawing the utility model is described in further detail.

Fig. 1 is the utility model circuit theory diagrams.

Fig. 2 is the circuit theory diagrams of another embodiment of the utility model.

Fig. 3 is the vertical section structure synoptic diagram of the utility model embodiment test pen.

The utility model includes plastic casing 2, test contact 1, current-limiting resistance R ₁, drive sound and light show circuit and hand touched electrode 7, driving sound and light show circuit is by BG ₁, BG ₂, BG ₃Compound transistor amplifying circuit and load hummer HTD LED cross-over connection both ends of power thereof constitute, test contact 1, current-limiting resistance R ₁Series connection is joined with compound amplifying triode base stage, and hand touched electrode 7 is joined with compound amplifying triode collector, is characterised in that it also has one/two the divider resistance R that are electrically connected with compound amplifying triode base stage ₂With/R ₃Branch road, promptly the base stage of compound amplifying triode also with one/two divider resistance R ₁With/R ₃Link to each other divider resistance R ₂, R ₃Join divider resistance R with power supply ground ₁, R ₃Branch road optionally is communicated with respectively, and it all is connected, disconnects two kinds of duties, is as shown in Figure 2 to divide in addition with three gear toggle switch K to be communicated with, to disconnect.R ₂As the divider resistance branch road of hazard recognition voltage, it generally is 20～80 volts according to pre-determined danger/starting voltage value, determines its resistance, usually current-limiting resistance R ₁Resistance is several megaohms, so preferably get 1/50～6/50 of current-limiting resistance value, i.e. R ₂Resistance is 100K-600K Ω preferably, when whether the differentiation measurand has dangerous voltage, and divider resistance R ₂Be access in test circuit, if tested metallic object when having not dangerous high potential the acousto-optic display original set stop acoustic luminously, and the acousto-optic display original set keeps the sounding build-up of luminance when having dangerous voltage.

At R ₂, R ₃When not being access in, this test pen is reported to the police as high voltage testing, prompting and is used.When having than strong-electromagnetic field around this test pen, when promptly high-voltage charged body being arranged, the base stage of test contact, compound amplifying triode produces induced potential, when compound amplifying triode base stage induced potential reaches its operating voltage, amplifying circuit work, acousto-optic element shows.

At R ₃When being access in, this test pen uses R as the test break-make ₃Function and R ₂Identical, its resistance value is several megaohms, and preferably 3～6 megaohms are worked as R ₃It overcomes/reduces the influence of ambient electromagnetic field to compound amplifying triode base stage when being access in test circuit, makes carrying out that test circuit can be accurately stable to lead, and whether the test of break-make quality such as filament, transistor etc.

As shown in Figure 3, the utility model is made into the screwdriver shape, but double as screwdriver usefulness, shell is that handle 2 is that transparent plastic is made, and it has a cylindrical cavity 4, and test circuit device element and battery 5 are installed on the circuit board, are contained in the cavity 4.The circuit board two ends are provided with elastic metallic contact 9,10, and lower end contact 10 touches with test contact 1 the inner of cutter head shape.Hand touched electrode 7 is arranged on the bonnet 3, and it touches with the elastic metallic contact 9 that is arranged on the circuit board, offers slotted eye on shell 2 shell walls, is used for being communicated with, disconnecting R ₂, R ₃The handle 12 of dialling of switch 8 stretch out outside this hole, control outside shell with hand,

The utility model is simple in structure, can make normal screws cutter test pencil, and whether test 500 volts of following metallic objects charged, and can distinguish dangerous voltage and alterating and direct current, and can also make high voltage electroscope and do the circuit on-off test, it is practical, price is low, and is easy to carry.

Claims

1, a kind of multifunctional testing pen comprises by plastic casing, test contact, current-limiting resistance, compound transistor amplification sound and light show circuit and hand touched electrode and forming, and it is characterized in that it also has one/two divider resistance R ₂With/R ₃Forthright, divider resistance R ₂With/R ₃One end is electrically connected with compound amplifying triode base stage, and the connection of the other end is with R ₂With/R ₃Have by/be communicated with, disconnected joining of two kinds of duties respectively with power supply ground.

2, test pen according to claim 1 is characterized in that divider resistance R ₂Resistance be current-limiting resistance R ₁Resistance

Divider resistance R ₃Resistance be 3～6 megaohms.

3, according to claim 1,2 described test pens, it is characterized in that test circuit element and battery are installed on the circuit board, the circuit board two ends are provided with elastic metallic contact 9,10.In the handle 2 of this test pen of making the screwer shape, offer a cylindrical cavity 4, circuit board is installed in the cavity 4, hand touched electrode 7 is arranged on the bonnet 3, elastic metallic contact 9,10 touches with test contact 1 the inner and hand touched electrode 7 respectively, on shell 2 shell walls, offer slotted eye, be used for being communicated with, disconnecting R ₂, R ₃The handle 12 of dialling of switch 8 stretch out this hole.