CN2132355Y

CN2132355Y - Wire breakage detector

Info

Publication number: CN2132355Y
Application number: CN 92232459
Authority: CN
Inventors: 邱礼儒
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-09-01
Filing date: 1992-09-01
Publication date: 1993-05-05
Anticipated expiration: 2002-09-01

Abstract

The utility model relates to a wire breakage detector which is used for the wire breakage of customer station set wires and other independent two-wire circuits, particularly the obstruction positions of on-line hidden wire breakage, etc. The utility model is composed of a detection signal generator and a receiver; two sets of cubicle switches which are used for the allocation signals and the earthing of wires are arranged in the signal generator; the cubicle switches harmoniously work under the action of control signals in the generator, and a receiver can sense and detect along wires at more than the distance of 30 centimeters. The utility model can reliably identify the good, the single wire broken and the double wire broken of the circuit. The obstruction points are conveniently and expeditiously found, and dark line defect in wall or path can also be conveniently detected. The utility model has the advantages of small structure, convenient operation, high sensitivity, high reliability, low power expenditure, etc.

Description

Wire breakage detector

The utility model relates to independently burn out check instrument of surveying of two-wire circuit broken string position of a kind of telephone subscriber's of being used for phone line and other, and it is made up of detection signal generator and receiver, and receiver comprises pops one's head in and amplifier two parts.

In the telephone network, between telephone set and the cable distribution equipment, mostly be independently twin cable or twisted pair, to make somebody a mere figurehead, to lay along wall or indoor concealed wire mode, because of long-term use, disconnection fault are one of modal faults of this circuit, core conductor is disconnected mostly, external insulation layer is intact, i.e. broken string in the line.This type of fault does not have special-purpose detection instrument so far.The maintenance personal connects earphone in one section one section ground, road along the line, listen and have or not office side's power supply or signal tone, judge whether to cross the disconnection fault point with this, this kind mode of operation is because of must be with earphone cord and phone line conductor UNICOM, so wire insulation will be destroyed in the checkpoint, or open original terminal, both hindered line, work efficiency is low again, and in order to improve work efficiency, the maintenance personal who has DB-1 type acousto-optic electroprobe on probation is surveyed the disconnection fault point of phone line, but when adopting this electroprobe to survey with induction mode, because of this pen induction enlarging function a little less than, thereby must be inserted in 220 volts of firewire jacks, and this kind operation is for phone line by survey line, be that the breach of security is regular and unallowed, if do not insert, then the 50HZ alternating magnetic field because of not having the above power-frequency voltage of 220V and this voltage to set up is surveyed so can not realize induction.Another kind of mode is probe to be passed wire insulation directly contact conductor, could discern the situation of this tape direct voltage substantially, judges whether broken string whereby.So it is very little to survey phone line disconnection fault improvement effect with this electroprobe.

A kind of " the multi-functional buzzerphone of cable " disclosed in the CN2048194U utility model patent, this buzzerphone adopts playback set and is made up of detection amplifying device two parts that probe, amplifier are formed, but this patent is mainly used in the ordering of cable core check mark, it is surveyed amplifying device and has small portable, the induction sensitive characteristics.This device is not suitable for the detection of two-wire circuit broken string obstacle.

The purpose of this utility model is to overcome the weak point of above-mentioned prior art, a kind of burn out check instrument of being made up of detection signal generator and receiver is provided, the fast interrupted audio signal that its generator signal source produces is by the control of distribution control circuit and the cross-join of dispense switch and earthed switch, this signal is alternately sent into by survey line, and the line of feed signals does not replace into ground, survey by small-sized pen type receiver induction again, can find out the obstacle position quickly and effectively, heart yearn also there is not any damage, and structure is light and handy, can solve the defective of prior art preferably.

The purpose of this utility model can realize by following measure:

This burn out check instrument is made up of detection signal generator and receiver, and receiver is continued to use the detection amplifying device of CN2048194U patent.Its characteristics are embodied in the generator circuit design, and this generator is made of detectable signal source, distribution control circuit, dispense switch, earthed switch and indicating circuit.The detectable signal source that is made of two oscillators produces the quick interrupted hum detectable signal of about 600HZ, through capacitor C ₃Dispense switch MK is delivered in coupling ₁, MK ₂Input, two switches are alternately closed thus, and detectable signal is alternately delivered to test line L ₁, L ₂

Distribute in the control circuit to be provided with the square-wave oscillator at a slow speed that be about 2 seconds a cycle of oscillation, the control signal of its output, the one tunnel directly send dispense switch MK ₁Control end, another Lu Zejing not gate F ₅Send dispense switch MK after anti-phase ₂Control end, the square-wave signal at a slow speed that this two phase is opposite promptly is used to control MK ₁, MK ₂alternately open and close.

Transistor BG in the earthed switch ₁, BG ₂Be connected to respectively by survey line L ₁, L ₂And between the ground G, because the ground level control line and the two dispense switch MK of this two switching tube ₁, MK ₂The control line cross-over configuration, what make feed signals not is the short circuit conducting by survey line with ground G, this has just solved detectable signal effectively and has been coupled to other single line by distributed constant between the single line warp and causes receiver to the impalpable contradiction of break point.

Indicating circuit is set with display working condition, by distributing not gate F in the control circuit ₄The square-wave signal at a slow speed in 2 seconds cycles of output, not gate F in this circuit ₆And the narrow pulse forming circuit processing, be switching tube BG ₃The burst pulse of desired positive polarity duty ratio about 0.1 is provided, makes indication LED by F ₄Output signal frequency is glimmered at a slow speed, and power consumption is economic.

Compared with the prior art the utility model has following advantage:

1, adopts non-contacting induction detection mode, can be apart from by the distance of survey line more than 30 centimeters, do not damage wire insulation, reliably and delicately survey independently two-wire circuit breakpoint obstacle and dark line defect within the walls, also detectable concealed wire path, and it is disconnected or two-wire disconnected to discern single line, and detection process is easy, quick.

2, adopt the cross-coupled combining structure of control line of earthed switch and dispense switch, detectable signal is alternately sent into by survey line through this structure by control signal, the line that will not connect signal simultaneously replaces into ground, thereby effectively overcome signal because of the impalpable contradiction of breakpoint that distributed constant coupling between line causes, made these facility that sensitivity be arranged and reliable detection performance.

3, this machine has adopted integrated design, and the equal small volume and less weight of signal generator and receiver can be put in the pocket and carry, and is simple, convenient.

4, signal generator is with 6 volts of laminated cells, and electric current is less than 2 milliamperes, and is available more than 80 hours, and receiver is with 1.5 volts of button cells, and available had the power consumptive province more than 100 hours, advantage with low cost.

The utility model Figure of description is as follows:

Fig. 1. the utility model signal generator circuit figure

Fig. 2. the utility model acceptor circuit figure

Fig. 3. the utility model receiver output waveform figure

Embodiment will do as detailed below in conjunction with the accompanying drawings.

Fig. 1 is the utility model signal generator circuit figure.Detectable signal source (1) constitutes the not gate F that has the schmidt trigger characteristic in the circuit (2) by low speed square-wave oscillator (2) and audio frequency oscillator (3) ₁And capacitance-resistance R ₁C ₁The low speed square wave oscillation of the about 4HZ of combination results, frequency are by R ₁, C ₁Parameter is determined; Not gate F in the circuit (3) ₂Capacitance-resistance R ₂, C ₂The audio frequency square-wave signal of combination results one 600Hz, frequency is by R ₂C ₂Parameter is determined.Because diode D ₁Connection, the vibration of circuit (3) then is controlled by circuit (2), only works as F ₁When being output as high level, circuit (3) could vibrate, and promptly the square wave oscillation of circuit (3) 600HZ is subjected to the modulation of circuit (2) low speed square-wave signal, so F ₂Be output as the interrupted four times audio signal of per second, frequency is 600HZ, sounds being interrupted audio signal fast, and this signal is through not gate F ₃Buffer compartment from after, by capacitor C ₃Be coupled to the input of dispense switch (6),, signal alternately sent into by survey line L by the dispense switch Control Allocation ₁, L ₂

Distribute control circuit (4) by square-wave oscillator (5) and not gate F ₅Form.Circuit (5) is a square-wave oscillator at a slow speed, and the cycle is about 2 seconds, by not gate F ₄Capacitance-resistance R ₃C ₄Form, frequency is by R ₃C ₄Parameter is determined.F ₄The output high-low level continues one second, alternate respectively, and the control signal one tunnel of this output is directly sent dispense switch MK ₁Control end, another road is through F ₅Send dispense switch MK after anti-phase ₂Control end, this makes and two dispense switch in the circuit (6) alternately opened and closed respectively by one second time interval, alternately delivers to by survey line L at interval by one second thereby controlled the fast interrupted detectable signal that circuit (1) produces ₁L ₂

Earthed switch (7) is by switching tube BG ₁, BG ₂, resistance R ₄R ₅Form R ₄, R ₅Be respectively transistor BG ₁BG ₂Biasing resistance, this two-transistor works on off state.Because its base stage output and two dispense switch cross-join, i.e. MK ₁Control end is connected to BG ₂Base stage, and MK ₂Control end then is connected to BG ₁Base stage.And BG ₁, BG ₂Emission and collector electrode be connected on respectively with by survey line L ₁, L ₂Between.As dispense switch MK ₁When control end is high level, MK ₁Open, the detectable signal of being sent here by circuit (1) is sent to L ₁, while BG ₂Base stage also satisfy and close conducting because of obtaining high level, make L ₂Ground, L are gone in short circuit ₂Signal voltage is zero, and this moment, receiver was sensed has only L ₁On signal; In like manner, as analog switch MK ₂Open, detectable signal is delivered to L ₂The time, transistor BG ₁Then with L ₁Short circuit goes into ground.This has just thoroughly solved detectable signal and has been coupled to other single line by substep parameter between the single line warp and causes the impalpable contradiction of break point.The function of circuit (6) is that quick interrupted detectable signal alternately is dispensed to by survey line L ₁, L ₂, any moment all has only the single line feed signals, and another root does not send.The function of circuit (7) then is to make any moment not connect the line and the ground reliable UNICOM of G of signal.Thereby make this line to obtain signal from dispense switch, can not obtain signal from other single line with induction mode again, promptly do not connect the line of signal, its signal voltage is always zero, like this at normal reach, i.e. and L ₁, L ₂Under all good not disconnected situation, receiver signal output waveform such as accompanying drawing 3(a); When single line is had no progeny, this disconnected root line is whenever equal no signal voltage behind breakpoint, and single line was assigned to one time signal every one second in addition, so the receiver output signal is the quick discontinuous signal that occurred at interval with 1 second, as accompanying drawing 3(b), this signal is very easily discerned itself, and very big with the output signal difference of good section, good segments sounds and is " dichloro-diphenyl-dichlorothane ... ", behind the disconnected single line be " dichloro-diphenyl-dichlorothane drip---dichloro-diphenyl-dichlorothane drip---... " When two lines all disconnected, at this moment, behind the breakpoint no matter be L ₁Or L ₂All do not have detectable signal voltage, the output of receiver no signal is as accompanying drawing 3(C).

Indicating circuit (8) is by not gate F ₆, narrow pulse forming circuit (9), switching tube BG ₃, show LED and resistance R ₇R ₈Form.Not gate F ₄The cycle of output is 2 seconds a square-wave signal at a slow speed, through F ₆Buffering enters narrow pulse forming circuit (9).This circuit is by not gate F ₇, F ₈, capacitance-resistance R ₆C ₅, diode D ₂Form C ₅R ₆Be differential circuit, diode D ₂Curb negative differentiated pulse, not gate F ₇, F ₈With positive differentiated pulse shaping, guarantee to provide switching tube BG simultaneously ₃Desired positive pulse, F like this ₈What export is about 0.2 second of duration, 1.8 seconds the rectangle burst pulse in interval, and this pulse is through biasing resistance R ₇Deliver to transistor BG ₃Base stage, BG ₃Saturation conduction, indicator light LED is bright, after the pulse duration, BG ₃No bias current, it turn-offs thereupon, and LED extinguishes.LED presses F ₄2 second cycle of output is glittering, and about 0.1 because make-to-break ratio is very little, so this circuit structure guarantees current drain seldom, the average current of LED is not more than 1 milliampere, R ₈Be load resistance.

Fig. 2 is the utility model acceptor circuit figure.Probe (10) is integrated with amplifier (11) on its structure, adopts the lip pencil small-scale structure, can conveniently hold the Yu Shouzhong operation.

Amplifier (11) has adopted the low noise super to make input stage, BG ₄Its emitter meets R ₁₂, R ₁₂Be Current Negative Three-Point Capacitance resistance, make circuit have high input impedance.Probe (10) just can induce signal voltage near being detected line, this voltage is through transistor BG ₄, BG ₅, BG ₆After three grades of amplifications, by capacitor C ₁₃Coupling exports receiver J-Horner CK to.R ₁₀, R ₁₃, R ₁₅Be respectively BG ₄, BG ₅, BG ₆Biasing resistor, R ₁₁, R ₁₄, R ₁₆Be respectively its load resistance, C ₁₀～C ₁₃Be respectively coupling capacitances at different levels.This amplifying circuit adopts 1.5 volts of minimum voltage unit, and K is a mains switch, C ₁₄Be power filtering capacitor, circuit overall gain G is more than or equal to 30 decibels, total power consumption P ₀≤ 2 milliwatts.

When surveying the broken string obstacle position of phone line, usually at the cable distribution equipment place, phone line L ₁L ₂Take off from separated time equipment, receive on the signal generator, ground wire connects the signal generator ground wire terminal, and the phone end is not done any processing, surveys along the line with receiver then, can find out the broken string position rapidly.If single line is disconnected, find the broken string position after, only must be separately with two lines, relatively the institute's number of making inquiries about difference can distinguish it is which root line broken string rapidly on two lines.

See accompanying drawing 3, i.e. signal has shown under the different broken string states, the pairing signal characteristic of exporting to earphone after receiver amplifies.At A section, L ₁L ₂Two lines are all good, and what heard this moment is fast interrupted audio signal, promptly " dichloro-diphenyl-dichlorothane dichloro-diphenyl-dichlorothane ... "; When disconnected single line, i.e. section B, hear this moment is one second quick discontinuous signal at interval, that is: " dichloro-diphenyl-dichlorothane dichloro-diphenyl-dichlorothane---dichloro-diphenyl-dichlorothane drip---... " Work as L ₁L ₂Two lines are all disconnected, and promptly section C does not have detectable signal output this moment, looks into the broken string position with the utility model, promptly is the variation portion of looking for two kinds of unlike signal states with induction mode, and adopting interrupted its effect of detectable signal fast is that signal both had been easy to identification, saves energy again.

Claims

1, burn out check instrument, form by detection signal generator and receiver, receiver is made up of probe (10) and amplifier (11), it is characterized in that signal generator is by detectable signal source (1), distribution control circuit (4), dispense switch (6), earthed switch (7), indicating circuit (8) is formed, and wherein detectable signal source (1) comprises low speed square-wave oscillator (2), audio frequency oscillator (3) and diode D ₁, not gate F ₃Distribute control circuit (4) to comprise square-wave oscillator (5) and not gate F ₅Indicating circuit (8) comprises narrow pulse forming circuit (9), not gate F ₆, show LED, switching tube BG ₃And resistance R ₇R ₈

2, burn out check instrument according to claim 1 is characterized in that low speed square-wave oscillator (2) is by not gate F ₁With capacitance-resistance R ₁C ₁Form; Audio frequency oscillator (3) is by not gate F ₂And capacitance-resistance R ₂C ₂Form, between this two oscillator by diode D ₁Connect, the low speed square-wave signal that the former produces is by diode D ₁The audio signal that the modulation latter produces.

3, burn out check instrument according to claim 1 is characterized in that square-wave oscillator (5) is by not gate F ₄, capacitance-resistance R ₃C ₄Form, the control signal one tunnel of its generation is directly sent dispense switch MK ₁Control end, another road is through not gate F ₅Give another dispense switch MK after anti-phase ₂Control end.

4, burn out check instrument according to claim 1 is characterized in that dispense switch (6) comprises MK ₁, MK ₂, the fast interrupted audio signal of being sent here by detectable signal source (1) is through capacitor C ₃Coupling divides two-way to deliver to MK ₁, MK ₂Input.

5, burn out check instrument according to claim 1 is characterized in that earthed switch comprises transistor BG ₁, BG ₂, resistance R ₄R ₅, BG ₁, BG ₂Base input end and dispense switch MK ₁, MK ₂The control end cross-join, its emitter and collector electrode be connected to respectively and L ₁L ₂Between.

6, burn out check instrument according to claim 1 is characterized in that narrow pulse forming circuit (9) is by not gate F ₇, F ₈, diode D ₂With capacitance-resistance R ₆C ₅Form, by square-wave oscillator (5) F ₄The signal of output is through F ₆Buffering enters narrow pulse forming circuit (9), and the rectangle burst pulse of its output is through biasing resistance R ₇Deliver to transistor BG ₃, make the LED cycle glittering.

7, burn out check instrument according to claim 1 is characterized in that F ₁～F ₈For having the non-gate ic of schmidt trigger characteristic.Dispense switch is an integrated analog switch.