CN2283263Y

CN2283263Y - Multipurpose testing instrument for communication cable

Info

Publication number: CN2283263Y
Application number: CN 96246025
Authority: CN
Inventors: 滕建
Original assignee: TAIDELI COMMUNICATION TECHNOLOGY SERVICE Co Ltd NANJING
Current assignee: TAIDELI COMMUNICATION TECHNOLOGY SERVICE Co Ltd NANJING
Priority date: 1996-12-27
Filing date: 1996-12-27
Publication date: 1998-06-03
Anticipated expiration: 2006-12-27

Abstract

The utility model relates to a testing device for communication cables, which comprises far end and near end planar relay network and microcomputer systems of the far end planar relay network and near end planar relay network. The public lines end of the near end planar relay network is connected with the input end of the testing wire of a testing selection control. A mega ohm testing source and a resistor testing source are connected with the input end of the signal source of the testing selection control. The control end of the testing selection control is connected with the near end microcomputer system The output end of the testing selection control is respectively connected with a mega ohm test unit and a resistor test unit. An analogue-to-digital converter is connected with the near end microcomputer system to achieve the outputs of the mega ohm test unit and the resistor test unit and the near end microcomputer system is connected with the far end microcomputer system by input-output lines to ensure the near end microcomputer system and the far end microcomputer system have simultaneous signals.

Description

The multiple purpose communications cable tester

The utility model relates to a kind of proving installation, particularly a kind of device that is used for the telecommunication cable test.

At present, in the telecommunication cable construction, have two leading indicators to test, one is insulativity, and another is a loop resitance.The former, and the megohmmeter that adopts is manually searched test one by one, also needs crank feed manually when especially using, and very easily causes various faults, even can burn cable pair, and troublesome poeration, labour intensity is big, waste time and energy, its pointer multi-scale reading makes precision can not get effective assurance in addition.The latter then more adopts multimeter to test, and it is right, time-consuming also to need manually to search line one by one during use, uses inconvenience.Above-mentioned two kinds of test instrumentation function singlenesses, automaticity is low, and is not replaceable, and their whens test, all needing the personnel at cable construction two ends to get in touch with cooperation can carry out, this long during apart from field construction difficulty bigger.Therefore the proving installation that in cable construction, always lacks a kind of comprehensive, robotization.

In addition, in cable construction, also often cause wrong line (mandarin duck to) easily, this fault search very difficulty, up to the present, also do not have a kind of effective ways that can address this problem.

The purpose of this utility model is exactly in order to address the above problem, and provides a kind of comprehensive strong, the automaticity height, and function is many, the cable tester of using easy to use more.

Technical solution of the present utility model:

A kind of multiple purpose communications cable tester, it includes far, the plane formula relay network (1) at nearly two ends, (2), network (1), (2) in each relay J on, following normally opened contact links to each other with tested cable two ends respectively, wherein in the network (1) each relay J on, following moving contact links to each other respectively, in the network (2) each relay J on, following moving contact connects together respectively as the public line end A of network (2), B two networks (1), (2) each relay J is controlled by respectively with far away, the driving circuit (3) that nearly two ends microsystem CPU1 links to each other with CPU2, (4), the public A that it is characterized in that near-end plane formula relay network (2), B two line ends connect the p-wire input end of test selection control (5), megaohm testing source (6) and resistance test signal source (7) connect the signal source input end of test selection control (5), the control end of controller (5) links to each other with near-end microsystem CPU2, the output terminal of controller (5) is connected to megaohm test cell (8) and resistance test unit (9) respectively, this two test cell (8), (9) output links to each other with near-end microsystem CPU2 by modulus converter A/D, and near-end CPU2 links to each other with far-end CPU1 by input-output line, to guarantee their signal Synchronization.

The utility model has been introduced the electronics megohmmeter first, it and multimeter circuit and microsystem organically are combined as a whole, make the utility model multiple functional, both can survey the insulativity of cable, can survey its loop resistance again, and can indicate the position of wrong line (mandarin duck to), and the automaticity height, need not the artificial cooperation in two ends can test multiple-twin cable easily simultaneously, and demonstration, printing test result, not only time saving and energy saving, the efficient height has also improved measuring accuracy greatly.

Fig. 1 is a theory diagram of the present utility model.

Fig. 2 is an electrical schematic diagram of the present utility model.

As Fig. 1,2, far away, the plane formula relay network (1) of near-end, (2) can be 50 * 2 network, and they all have 50 relay J, and the duty of each relay J of network (1), (2) is respectively by driving circuit (3), (4) control.Driving circuit (3), (4) are identical, constitute by row latch IC1 (model is 273), line driver IC2 (model can be 4066), row latch IC3 (model can be 273) and row driver IC4 (model can be 4066), the input end of IC1 and IC3 links to each other with the data line of microsystem CPU1 separately (or CPU2), and the output of IC2 and IC4 links to each other with the line bag two ends of each relay J in the plane formula relay network separately respectively with the ranks latticed form.Test selection control of the present utility model (5) can be by three relay J 1, J2, J3 constitutes, the last normally opened contact J1a of J1 is near the public line end B of transverse plane formula relay network (2), link to each other with the last normally opened contact J2a of J2 simultaneously, the last normally closed contact J1b of J1 meets the public line end A of network (2), link to each other with the following normally opened contact J2a ' of J2 simultaneously, the following normally opened contact J1a ' of J1 links to each other with following normally closed contact J1b ' and together links to each other with the earth G, the last moving contact J1C of J1 links to each other with the last normally closed contact J2b of J2, the following moving contact J1C ' of J1 links to each other with the following normally closed contact J2b ' of J2, the last moving contact J2C of J2 links to each other with the last moving contact J3C of J3, the following moving contact J2C ' of J2 links to each other with the following moving contact J3C ' of J3, the last normally opened contact J3a of J3 connects the output terminal of IC5 in the resistance test unit (9) that is made of amplifier IC5 and IC7 serial connection, the last normally closed contact J3b of J3 connects megaohm testing source (6), this signal source (6) is a high-voltage DC power supply, and it produces the high direct voltage of a 250V.The inverting input of IC5 in the following normally opened contact J3a ' connecting resistance test cell (9) of J3, simultaneously by resistance R connecting resistance testing source (7), this signal source (7) is a low-voltage dc power supply, it produces the dc low-voltage of a 12V, the following normally closed contact J3b ' of J3 connects by amplifier IC6, the in-phase input end of IC6 in the megaohm test cell (8) that the IC8 serial connection constitutes, J1, J2, the line Bao Jun of J3 links to each other by the control end of driver IC 9 (model can be 4066) with near-end microsystem CPU2, the output of megaohm test cell (8) and resistance test unit (9) is drawn the input that connects modulus converter A/D from the output terminal of amplifier IC8 and IC7 respectively, and the output of A/D links to each other with the data line of near-end microsystem CPU2.

The course of work of insulation measurement of the present utility model is as follows.Earlier with the two ends of tested cable A1-A50 and B1-B50 respectively with far, the plane formula relay network (1) at nearly two ends, (2) in each relay J on, following normally opened contact links to each other, this moment can be by panel feature key M control near-end microsystem CPU2 work, open capable latch IC1 and row latch IC3 in the driving circuit (4) under CPU2 portion's software effect within it respectively, by their row, corresponding relay J job in row driver IC2 and the IC4 gating near-end plane formula relay network (2), then a pair of tested cable that links to each other with this relay J (is assumed to Ai, Bi, i=1-50) the public line end A of access network (2), B.Simultaneously, CPU2 sends a group coding control signal by driver IC 9 pairs of tests selection control (5) under the software effect, and the coding difference of this control signal, the measurement content that controller (5) is selected are also different.If coded signal is 000 o'clock, then test each relay J 1 in the selection control (5), J2, the equal no current of line bag of J3, all moving contact J1C, J1C ', J2C, J2C ', J3C, J3C ' all links to each other with its normally closed contact separately, the 250V high direct voltage of megaohm testing source this moment (6) output is passed through J3b, J3C, J2C, J2b, J1C, J1b delivers to the public line end A of network (2), be on the tested cable Ai, and the earth G is by J1b ', J1C ', J2b ', J2C ', J3C ', J3b ' delivers to the input end of amplifier IC6 in the megaohm test cell (8), like this, tested cable Ai will reflect the size of current that the IC6 input end injects by the earth G the insulation resistance of the earth, and the corresponding signal of IC6 output is delivered to CPU2 outside reason and obtained tested cable Ai the insulating resistance value of the earth G is also stored after IC8 level conversion and A/D analog to digital conversion.If the coded signal that CPU2 sends is 001 o'clock, then J1 adhesive action, J2, J3 are constant, then the 250V high direct voltage of megaohm testing source (6) output is by J3b, J3C, J2C, J2b, J1C, the J1a public line end B to network (2), be on the tested cable Bi, and the earth G is constant, delivers to the input end of IC6 equally, in like manner finishes the Bi cable to the measurement of the insulation resistance of the earth G and be stored among the CPU2.When coded signal is 01 * time, then J3 is constant, J2 adhesive action, J1 can be free position, and the 250V high pressure of signal source this moment (6) output is connected to the public line end B of network (2) by J3b, J3C, J2C, J2a, on the promptly tested cable Bi, the public line end A of network (2), be tested cable Ai through the input end that J2a ', J2C ', J3C ', J3b ' deliver to IC6, so just can finish the measurement of the insulation resistance between Ai, the Bi two tested cables, and resistance is stored among the CPU2.As long as CPU2 by each relay J that ranks latch and driver just link to each other with tested cable A1-A50, B1-B50 in the gating network (2) successively, finishes each above-mentioned three top test index to tested cable according to certain sequential loop.

Loop resistance surveying work process of the present utility model is as follows.Tested cable A1-A50, B1-B50 still by above-mentioned connection be connected to far, on the relay network (1) of near-end, (2).When loop resistance is measured, CPU2 sends 11 * coding control signal, CPU2 sends the synchronous working signal to far-end microsystem CPU1 simultaneously, this moment, CPU1 carried out identical circulation software with CPU2, open driving circuit (3) respectively, (4) row in, row latch and row, row driver, make far away, near-end relay network (1), (2) during periodic duty in synchronization the tested cable of institute's gating identical, if be Ai, Bi, on each relay J in the network (1), following moving contact links to each other respectively, and each relay J in the network (2) on, following moving contact connects together respectively as public line end A, B, then tested cable Ai, Bi by short circuit, is introduced into public line end A in near-end network (2) in far-end network (1), B.Because CPU2 sends 11 * coded signal, then J2 and J3 adhesive, J1 is a free position, the public line end A of network (2) is that tested cable Ai is by J2a ' like this, J2C ', J3C ', J3a ' is connected to the inverting input of amplifier IC5 in the resistance test unit (9), the public line end B of network (2) is that tested cable Bi passes through J2a, J2C, J3C, J3a is connected to the output terminal of IC5, simultaneously, the DC voltage of the 12V that resistance test signal source (7) is produced connects the inverting input of IC5 by resistance R, form constant-current source circuit, because tested cable Ai, Bi at far-end by short circuit, be connected to the input and output of constant current source again respectively at near-end, so the constant current source electric current is at tested cable Ai, the size that produces pressure drop on the formed loop resistance of Bi has just reflected Ai, the loop resistance size of Bi, and after the A/D analog to digital conversion, deliver to CPU2 again by amplifier IC7 level conversion and handle, obtain Ai, loop resistance numerical value between the Bi is also stored.As long as CPU1 and CPU2 finish each loop resistance measurement to tested cable according to identical sequential loop latch and driver gating each relay J far away, that closely link to each other with tested cable A1-A50, B1-B50 in network (1), (2) successively just by separately.If in actual measurement, when finding that loop resistance be infinity, then near-end CPU2 will judge that this is wrong line (be mandarin duck to) to tested cable, so that survey crew is searched.Final result can be controlled that display D shows or printer P prints by CPU2.

Claims

A multiple purpose communications cable tester it include far, the plane formula relay network (1) at nearly two ends, (2), network (1), (2) in each relay J on, following normally opened contact links to each other with tested cable two ends respectively, wherein in the network (1) each relay J on, following moving contact links to each other respectively, in the network (2) each relay J on, following moving contact connects together respectively as the public line end A of network (2), B, two networks (1), (2) each relay J is controlled by respectively with far away, the driving circuit (3) that nearly two ends microsystem CPU1 links to each other with CPU2, (4), the public A that it is characterized in that near-end plane formula relay network (2), B two line ends connect the p-wire input end of test selection control (5), megaohm testing source (6) and resistance test signal source (7) connect the signal source input end of test selection control (5), the control end of controller (5) links to each other with near-end microsystem CPU2, the output terminal of controller (5) is connected to megaohm test cell (8) and resistance test unit (9) respectively, this two test cell (8), (9) output links to each other with near-end microsystem CPU2 by modulus converter A/D, and near-end CPU2 links to each other with far-end CPU1 by input-output line, to guarantee their signal Synchronization.
2, it is characterized in that testing selection control (5) by the described multiple purpose communications cable tester of claim 1 can be by three relay J 1, J2, J3 constitutes, the last normally opened contact J1a of J1 is near the public line end B of transverse plane formula relay network (2), link to each other with the last normally opened contact J2a of J2 simultaneously, the last normally closed contact J1b of J1 meets the public line end A of network (2), link to each other with the following normally opened contact J2a ' of J2 simultaneously, the following normally opened contact J1a ' of J1 links to each other with following normally closed contact J1b ' and together links to each other with the earth G, the last moving contact J1C of J1 links to each other with the last normally closed contact J2b of J2, the following moving contact J1C ' of J1 links to each other with the following normally closed contact J2b ' of J2, the last moving contact J2C of J2 links to each other with the last moving contact J3C of J3, the following moving contact J2C ' of J2 links to each other with the following moving contact J3C ' of J3, the last normally opened contact J3a of J3 connects the output terminal of IC5 in the resistance test unit (9) that is made of amplifier IC5 and IC7 serial connection, the last normally closed contact J3b of J3 connects megaohm testing source (6), the inverting input of IC5 in the following normally opened contact J3a ' connecting resistance test cell (9) of J3, simultaneously by resistance R connecting resistance testing source (7), the following normally closed contact J3b ' of J3 connects by amplifier IC6, the in-phase input end of IC6 in the megaohm test cell (8) that the IC8 serial connection constitutes, J1, J2, the line Bao Jun of J3 links to each other with the control end of near-end microsystem CPU2 by driver IC 9, the output of megaohm test cell (8) and resistance test unit (9) is drawn the input that connects modulus converter A/D from the output terminal of amplifier IC8 and IC7 respectively, and the output of A/D links to each other with the data line of near-end microsystem CPU2.