CN2245312Y - Portable telephone line testing device - Google Patents

Abstract

The utility model discloses an electronic device and more specifically a multifunctional portable testing and searching device for telephone circuits, and the utility model is mainly composed of a loop resistance comparator, a trigger, an alarming device, a ringing generator, a liaison telephone, a breaking detector, an independent power supply, etc. A testing lead-out wire (40 is connected with the line of a tested telephone, and corresponding function keys (13, 14, 15 and 16) are operated to test wire breaking, stranded wire, grounding and insulation resistance and conduct electrical cable alignment. The utility model adopts a digital integrated circuit, so the utility model is small in volume, the utility model can be carried about by a line mechanic to a wire stand to conduct self-testing, and the testing searching and maintenance task can be independently completed without the cooperation and guidance of office measuring operators; the utility model lightens the labor intensity, raises the work efficiency and shortens the barrier duration.

Description

Multifunctional portable telephone line test testing device

The utility model relates to a kind of multifunction electron device of testing local telephone line fault.

At present, the used testing device of local telephone line fault person for testing and repairing (lineman) is actually a kind of simple and easy hand telephone set that there is no test function, just uses for contact.When looking into barrier, under intra-office test desk personnel's cooperation commander, search the fault point piecemeal.After fault is got rid of, call out again liaison bureau in that the surveyor asks repetition measurement and oneself user of reparation that breathes out is confirmed.But because of the intra-office test desk has only one for one innings, for one man operation.Often cause several lineman on line pole simultaneously or take turns to wait for surveyor's cooperation test.This traditional operating type is passive, poor efficiency, last long, increased work load to the lineman.

The purpose of this utility model is to overcome the shortcoming of above-mentioned testing device, provides a kind of and has line fault test, arbitration functions and can carry out the check the number portable multifunctional route survey testing device of insulation resistance between each survey line of cable.The operator need not the surveyor and cooperates commander, can independently finish the overall process of whole line test, judgement, Cha Xiu and confirmation.

The purpose of this utility model is achieved in that on the structure have the loop resistance comparator of 3 test lead-out wires (a, b, c) to link to each other with trigger, and trigger links to each other with alarm device, and the three constitutes the control relation of going forward one by one step by step; Thread break detector links to each other with ringing current generator, and controlled by it, and output links to each other with trigger, makes burn out detection signal controlling flip-flop operation; The contact phone is connected across on the test lead-out wire behind partiting dc capacitor and power supply key; C line in the test lead-out wire is connected on the slide key, can slip to a, b line respectively as required.The measurement circuit twisted wire, bump ground, when insulation resistance and cable are checked the number, use options button, 3 test lead-out wires insert the test line network, the loop resistance comparator obtains the loop resistance comparative voltage of test line, by this comparative voltage control trigger, again by trigger control alarm device, with the fault category of the mode circuit of audible and visual alarm.Add during burn out detection by ringing key, utilize ringing signal can become the loop to decide the thread break detector output level, remove to control step by step trigger and alarm device, with the mode circuit state of audible and visual alarm.

Route survey circuit part of the present utility model has adopted integrated circuit in a large number, and the test accuracy of judgement can be made very for a short time again, and the upper boom that is easy to carry is convenient to operation.Avoided existing old-fashioned test desk to adopt the empirical and inaccuracy that exists in the survey method that simulates of relay control universal instrument.

Fig. 1 is the electrical principle block diagram of multifunctional portable telephone line test testing device;

Fig. 2 is the electrical schematic diagram of multifunctional portable telephone line test testing device;

Fig. 3 is a contact phone electrical schematic diagram;

Fig. 4 is the structure cutaway view of multifunctional portable telephone line test testing device.

Below in conjunction with accompanying drawing most preferred embodiment of the present utility model is elaborated

Fig. 1 shows the electrical block diagram of this portable multifunctional test testing device.The utility model is provided independently power supply for oneself, and with 12V rechargeable battery pack (cooperate charger, use prior art), this power supply can directly supply the operate as normal of alarm device, trigger and loop resistance comparator.In view of phone circuit and the higher needs of ringing current generator output ringing voltage, so also the 12V power supply will be boosted to 50V simultaneously.Give ringing current generator and the work of contact phone.When measurement circuit twisted wire, insulation, ground vapour and cable are checked the number, the A of loop resistance comparator, B, C test clip are clipped on the test line, and its equivalent loop resistance is compared, and obtain the comparative voltage signal, this voltage signal is sent into the trigger that is compared device control, again by trigger control alarm device.Alarm device shows the status categories of test line in audible and visual alarm device mode.Surveying broken string is can not constitute the loop with ringing-current, thereby thread break detector obtains an alarm control level, and this level is delivered to the trigger that is subjected to thread break detector control, with above-mentioned the same, and control acousto-optic alarm device.

Fig. 2 is the electrical schematic diagram that portable multifunctional is measured testing device.K is a battery main switch, and E is the 12V battery pack.The pin 1-6 of R1-R4, C1-C3, T1, T2, L, N2 (four rectifier diodes), N1 forms the power supply booster circuit.Wherein N1 adopts CC4069 integrated package (pin 14,7 connects power positive cathode respectively), and this integrated package is six groups of inverters, and its each inverter all is made up of the most basic single-stage inverter.Now using its first three level (1-6 pin) and C1, R1, R2 to constitute typical duty ratio is that 1: 1 square-wave generator (frequency formula f=1/1.4R2C1) frequency of oscillation is taken at and is convenient to the coupling transformation about 500HZ.When K closes, the square-wave pulse of generation through the third level (pin 5.6) of N1 isolate anti-phase after, drive T1, T2 and amplify, boost by pulse transformer L again, N2 rectification, C2, C3 filtering become the output of 50V direct voltage, for subordinate's circuit work power.The WD1 step-down, making the N3 operating voltage is 12V.

N3 integrated package (available homemade time-base circuit 5G1555 integrated package is commonly called as 555 circuit, and its pin 8,1 connects the power supply positive and negative electrode respectively, and 4 pin are trigger ends, and 3 pin are outputs), and R6, R7, C5, C6 constitute common 555 circuit oscillators.They again with T3-T5 and R8-R10, D2, D3, LED1 form ringing current generator.When pressing K1,3,4 junction closures, 555 circuit obtain power supply and oscillatory work, 3 pin of N3 go out the square-wave signal (f=1/0.693 (R6+2R7) C5) of 25HZ, when 3 pin of N3 are low level (about 0V), T3 ends, and T4, T5 are respectively through R9, R10 saturation conduction.At this moment, the C utmost point of T5 (also being the C level of T3) has 1,2 contacts of a 50V direct current bell signal pulse stream through D3, LED1, K4, and from clip A output, that delivers to the phone that shaken is subjected to bell circuit and partiting dc capacitor.When N3 output high level (about 12V), the T3 saturation conduction, T4, T5 end.At this moment.Before the electric charge of ringing-current pulse on the phone capacitance of half cycle turn the reverse low impedance path that constitutes through the C-e of D2 and the T3 utmost point around and fully discharge, what be beneficial to that the pulse of next 50V ringing-current acts on the phone that shaken effectively is subjected to the bell circuit.Through test, though this ringing-current is the non-return-to-zero signal, because of having taked the capacitor discharge path, the ring effect is very good.The contact the 1, the 2nd of K1 among the figure, anti-ringing-current seal in phone circuit LED and ear-piercing.Diode D1 is that ringing-current seals in circuit and establishes when preventing by ring.

Contact phone TEL adopts existing skeleton symbol phone circuit, can call out, be subjected to bell, conversation to get final product.An its termination ringing key K1 also attaches on a p-wire between behind the contact of C7//K4, and another termination C8//K4 attaches on the b p-wire.

Loudspeaker Y, alarm indicator LED2 and C11-C13, R14-R16 and N4 (555 integrated package) form 555 oscillating alarm devices jointly.Suitably select the value of R15, R16, C13, can get frequency and be about 1100HZ, the suitable alarm signal of listening of people's ear.When 4 pin of N4 obtain high level triggering (T6 conducting), warning circuit work, Y is loud, LED2 is glittering, appearance sound, light alarm.

Trigger is made up of T6, T7, N1 (back three grades of inverters of integrated package CC4069, pin 9-13) and R17-R22, R27.Wherein the pin 10-13 of N1 and R20, R21 constitute the Schmidt trigger of adjustable level, and R21 is the resistance of regulating circuit changing voltage value, when its real work trigger voltage (11 pin of N1) connects positive pole greater than the half of E, otherwise connect negative pole.The size of the value decision Schmidt trigger gate voltage winding degree (permissible error of trigger-gate voltage) of R20/R21.Employing has the purpose of winding circuit to be to improve the functional reliability of trigger.(CC4069's isolation matching stage of the pin 8-9 of N1 and R22 composition trigger works under the 12V power supply, triggering turnover door voltage is 5V), as seen from the figure, has only the VF (8 pin of corresponding N1) of working as less than 5V, 12 pin of N1 go out high level (about 12V), make T6, T7 saturation conduction, the e level of T6 goes out high potential (about 12V), and 4 pin of delivering to N4 make alarm device work and send audible and visual alarm.

R23-R26, K2, K3, test lead-out wire a, b and clip A, B are connected on test lead-out wire C and clip C thereof on the K2, and are connected across being used on p-wire a, the b line and eliminate the anti-interference capacitor C 15 that the telephone line distributed capacitance disturbs and form the loop resistance comparators.R23, R24 are the insulation comparison resistances, and R25, R26 are the twisted wire comparison resistances.Be noted that: twisted wire (phone internal short-circuit fault is also judged as twisted wire in test) comprises direct contact twisted wire and the untouchable twisted wire by the conduction of the 3rd media.The former equivalent loop resistance value less (being generally less than 2 kilo-ohms), latter's equivalence loop resistance is bigger.When loop resistance≤4 kilo-ohm, still can work reluctantly in switch request working line loop resistance≤2 kilo-ohm theoretically, and gather in the practice and experiment all shows.In other words: when untouchable twisted wire loop resistance reached 4 kilo-ohms, switch went out engaged signal, and subscriber phone can't have been used, and in actual the maintenance, untouchable twisted wire is this critical standard, that is: K _XIn the time of≤4 kilo-ohms, be twisted wire just.It has contained the equivalent loop resistance value of direct contact twisted wire, this and actual matching.So should be, as judging the whether actual foundation of twisted wire of circuit with this standard value and twisted wire equivalence loop resistance RX comparison.By the value of the gate voltage of CC4069 and dividing potential drop formula VF=E RX/ (RX+R25+R26) design R25, R26, make that as RX during VF is less than 5V (gate voltage) less than standard value, otherwise just greater than 5V.Can realize triggering control like this to trigger.During operation, being connected of open-circuit line and local side on separated time equipment, A, B clip are clipped in respectively on the telephone wire by user's one end (promptly progressively looking into the paragraph direction of repairing), again options button K2 is threaded onto ＂ 1 ＂ position (at ordinary times at ＂ 2 ＂).When twisted wire, RX is less than standard value, and VF is less than 5V as can be known by the dividing potential drop formula, and then 12 pin of N1 go out high level (about 12V), T6, T7 saturation conduction, and the e utmost point of T6 goes out 4 pin that high level acts on N4, and warning circuit work is spoken, light alarm.The cue circuit twisted wire, the lineman need continue downwards to look into and repaiies.Whether the survey line road bumps ground (ground vapour), need add folder C clip again on the lightning-arrest ground vapour line of separated time equipment, if a line bumps ground, then the C clip is through 2,3 contacts of K3, make b line and a line constitute a low impedance path, consider earth resistance interior (being generally less than 40 Europe), this loop resistance is significantly smaller than equivalent twisted wire loop resistance RX, thereby occurs and twisted wire audible and visual alarm in like manner; As with nowhere to turn to the police, just dial K2 its contact 2,3 is left, 1,2 link to each other, if the b line bumps ground, the C clip makes a line and b line constitute the low-resistance loop through 1,2 contacts of K3, in like manner, audible and visual alarm occurs, the prompting lineman searches and bumps the place.

As external force communication line being broken, and naked tread surface, may be not only ground vapour but also twisted wire to be arranged, and its test, alarm principle are also with aforementioned.

Get rid of when fault, press the ring of K1 key for several times, by power supply key K4,1,2 and 3,4 junction closures provide the conversation power supply to the user again, and oneself is normal to confirm circuit.If the user stays out, also can whether the loop be arranged from ringing-current, whether repeater lamp LED1 is glittering, confirmed.

Survey cable stamen line insulation quality: the wire insulation resistance of communication line (R is exhausted) specification requirement is more than 20 megaohms.Method of testing and principle and survey line road twisted wire in like manner just will be threaded to K2 ＂ 2 ＂ positions.R24, R25 and R compare dividing potential drop extremely, when R cuts off 〉=20 megaohms, and VF＞5V, as described above in like manner, with nowhere to turn to the police; When R cut off＜20 megaohms, audible and visual alarm appearred in VF＜5V, showed that insulation is defective between line.

Photoelectronic coupler N (4N26), current-limiting resistance R21 reaches

5,6 normally opened contacts of shape filter circuit C9, C10, R13, K1 are formed broken string and are examined then device.Because N, R11 and D3, LED1 are connected in parallel, when pressing the K1 key, a part of ringing-current flows through 4N26 and R11, and the interrupted conducting along with N glistens of its c-e utmost point makes 12V pulse voltage warp

VE is upgraded to high level (about 12V) after the shape filtering, acts on trigger, and N1 pin 12 goes out low level (about 0V), and T7, T6 end.The 4 pin Triggerless of N4 are with nowhere to turn to the police.If circuit is disconnected, stream does not become the loop, the not luminous also not conducting of N, and VE is a low level, makes 4 pin of N4 obtain high level and triggers through trigger, audible and visual alarm appears in warning circuit work, shows the circuit broken string.5,6 normally opened contacts of ringing key K1 make at ordinary times that VE low level (R12 is a discharge resistance) can't export trigger to, in order to avoid the mistake alarm.

When cable was checked the number, first, second two people respectively held one of this product, appoint interconnection in advance by traditional way, with interconnection on clip A, the B folder, press KT key (see figure 3) again, made 1,2 contacts disconnection, 2,3 junction closures, and two people can converse.Arrange a wherein side group K2 key (see figure 2) again, make its contact 1,2 closures, 3,4 disconnect.At this moment, when the C clip of first, second two humans oneself touched certain stamen line together, short circuit as twisted wire in like manner, sound and light alarm occurred through being touched the stamen line with regard to having caused a, b line, shows that this stamen line is intact.Throw off the C clip, the two people agreement of can conversing again continues to check downwards, number, and proofreaies and correct mistake, leakage, swinging cross, and C7, C8 prevent that both sides' electric power polarity is disturbed mutually and the partiting dc capacitor established in the circuit.

Fig. 3 shows talk-back electrical-mechanical schematic diagram.Adopt existing known technology, no longer describe in detail.But because of this product structure takes parts integrated, do not establish hand-held receiver in addition, so change the stage clip contact KT that is controlled by receiver in the primary circuit into manual button, function is constant.

Fig. 4 shows outward appearance and the structure chart that portable multifunctional is measured testing device.All electronic devices and components all are made on the total plate 5 of circuit.Battery 3 through the quiet chalaza of charging jack 17 again to circuit board power supply (this jack is a known products), battery main switch 6, ringing key 13, slide key 14, talk key 15, power supply key 16, talk key 20 and transmitter 8, receiver 9, warning horn 10, ringing-current lamp 12, stand by lamp 11 all link to each other with circuit board 5 through internal wiring, 21 is a lines in the test lead-out wire 4, the 22nd, b line, the 23rd, c line.It is to draw from the binding post 18 that links to each other with total plate 5.The 1st, plastic casing, the 19th, the support of total plate 5 of circuit and pulse transformer 7.The hole 2 of will restricting during use is that a rope is hung on the neck neck.Use relevant button and clip according to the content measurement that will carry out again.Because it is one medium-sized that a large amount of integrated packages that adopt, product can be made as ordinary telephone set.And shape such as portable phone are convenient to hand-held.

The utility model has changed traditional telephone line fault and has looked into the work flow of repairing, and has improved work efficiency, has shortened obstacle and has lasted, and wide application prospect is arranged.

Claims (6)

1, multifunctional portable telephone line test testing device, mainly form by DC power supply, stepup transformer, trigger, alarm device, loop resistance comparator, thread break detector, test lead-out wire, contact phone, anti-interference capacitor etc., it is characterized in that: the loop resistance comparator links to each other with trigger, trigger links to each other with alarm device, and the three is the control connection relation of going forward one by one step by step.

2, according to the described multifunctional portable telephone line test of claim 1 testing device, it is characterized in that: thread break detector links to each other with ringing current generator, and controlled by it, its output links to each other with trigger, and whether constitute the loop according to ringing-current, make the different level of photoelectrical coupler (N) output control the flip-flop operation state.

3, according to the described portable phone line test of claim 1 testing device, it is characterized in that: contact phone one terminates on the ringing key (13), and the other end is connected on the power supply key (20), and is connected across indirectly therefrom on a line (21) and the b line (22).

4, according to the described multifunctional portable telephone line test of claim 1 testing device, it is characterized in that: test lead-out wire (4) is to draw from the loop resistance comparator, is 3, and wherein C line (23) is connected on the key (14) of slip, can slip respectively to the a.b line.

5, according to the described multifunctional portable telephone line test of claim 1 testing device, it is characterized in that: each function key (13.14.15.16.20), alarm indicator (12), loudspeaker (10), and transmitter (8), receiver (9) all passes through wiring and links to each other with the total plate of circuit (5), and is installed on the housing (1).

6, according to the described multi-function telephones line test of claim 1 testing device, it is characterized in that: anti-interference capacitor (C15) is gone up and be connected with to a of lead-out wire (4), b line i.e. (21), (22).

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