CN2166463Y - Integral tester for failure of communication cable - Google Patents
Integral tester for failure of communication cable Download PDFInfo
- Publication number
- CN2166463Y CN2166463Y CN 93219349 CN93219349U CN2166463Y CN 2166463 Y CN2166463 Y CN 2166463Y CN 93219349 CN93219349 CN 93219349 CN 93219349 U CN93219349 U CN 93219349U CN 2166463 Y CN2166463 Y CN 2166463Y
- Authority
- CN
- China
- Prior art keywords
- circuit
- measuring
- output
- tester
- brachium pontis
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Measurement Of Resistance Or Impedance (AREA)
Abstract
The utility model relates to an integral tester for the failure of a communication cable. The utility model is used for measuring the insulating parameters among the core threads of the communication cable or the insulating parameter among the core threads and the ground, the distance from a disconnecting fault point to a measuring point, etc., and in particular, the tester provides an effective measuring means for solving the fixed point of the distance measuring of a movable low-insulating fault point under high voltage. The utility model adopts the modes of comprehensive utilization and separate process at the aspects of structural and combined modes, testing methods, parameter process and the process of the resource of soft hardware.
Description
A kind of intelligent test instrument that can accurately measure the telecommunication cable fault.
At present, home communications system construction and cable production often run into telecommunication cable stamen line over the ground, the defective insulation between line, problems such as broken string, the instrument of this class fault of the test of now having come into operation, its measuring accuracy is low, the fault distance of test is short, and measuring method is loaded down with trivial details, the more important thing is and can not accurately measure activity insulation fault under the high pressure.
The purpose of this utility model provides a kind of intellectuality, but all kinds of faults of test cable and the practical instrument of searching fault distance.
The utility model can carry out the defective insulation of cable, the measurement of lead loop resistance, ring length, electric capacity and disconnection fault range finding fixed point.It utilizes electrical bridge principle to realize measuring, and with the part of tested cable as brachium pontis, utilizes known parameters to ask for the parameter of measurand.Instrument is mainly by precision type bridge circuit (1), high precision measurement circuit (2), electric capacity, voltage transitions metering circuit (3), measuring amplifier (4), analog to digital converter (5), interface (6), single-chip microcomputer treatment circuit (7), automatic range switches (10), LCD (11), part such as power supply (16), (17), (18) is formed.
When instrument comes into operation, order is keyed in selection according to measurement parameter, the measurement core insulation is bad, during swinging cross, tested cable is connect A, the B end of precision type bridge circuit (1), measuring-signal through (1), measuring amplifier (4), analog to digital converter (5), interface (6), deliver to single-chip microcomputer treatment circuit (7), measurement result is shown by LCD (11).In the core component precision type bridge circuit (1) of this instrument, its main frame mode is: a end of the special inductive coil of wire (20) of this instrument, connect resistance R through switch (21)
2, R
1, C
1, R
3, form an electric bridge brachium pontis by five parts, the b termination C of another winding of (20)
2, R
4, form a brachium pontis by three parts.Two brachium pontis are respectively R in addition
5And R
6The bridge balance detection signal is through V+, V
-Output, anti-tampering for guaranteeing measuring accuracy, output V+, V
-Between insert two opposite polarity diode D and two series capacitance C
3, output signal is sent into analog to digital converter (5) after operational amplifier (22) two-stage is amplified.Bridge balance signal as calculated can be adjusted potentiometer R by liquid crystal display displays according to video data
1And R
2, reach balance up to electric bridge.Measure the loop resistance value Rx of failure cable heart yearn to the trouble spot, by keying in order, the automatic switch-over circuit of instrument is connected the high precision measurement circuit (2) that is used for measuring resistance automatically, and the back is by LCD (11) display result of instrument as calculated.
The cable loop resistance, the measurement of ring length, electric capacity, disconnection fault is approximate with the distance method that the trouble spot is calculated in test, just do not need the operation of balance bridge, directly key in and survey loop resistance, the order of ring length etc. is according to test command, instrument internal automatic switching signal path, as: survey loop resistance, ring length, signal are held to high precision measurement circuit (2) through A, B, survey electric capacity, broken string, and signal is held to electric capacity, voltage transitions metering circuit (3) through A, B.
In order to satisfy the requirement of this apparatus measures, this instrument is provided with in special-purpose the inductance coil of wire and the magnetic jar of packing into, the special inductive coil of wire adopt 4 lines and around, be 0.12mm through footpath φ, the number of turn is 270 circles, L
1=L
2=L
3=L
4=1.55H, the diameter phi of magnetic jar is 26mm.
The main electron device that adopts in this instrument has: single-chip microcomputer MCS-51 adopts 80C31, and interface adopts 82C55, and operational amplifier adopts 7650, and A/D converter adopts 7135, and other parts of instrument all adopt conventional electron device to realize.
Fig. 1 is the theory diagram of tester.
Fig. 2 is the measuring amplifier wiring diagram.
Fig. 3 is the precision type bridge circuit interconnect pattern.
Fig. 4 is the special inductive coil of wire.
Fig. 5 is a special inductive cigarette line chart.
(1) is the precision type bridge circuit among the figure, (2) high precision measurement circuit, (3) electric capacity, voltage transitions metering circuit, (4) measuring amplifier, (5) analog to digital converter, (6) interface, (7) single-chip microcomputer treatment circuit, (8) resistance, electric pressure converter, (9) proportional amplifier, (10) automatic range switches, (11) LCD, (12) timing circuit, (13) d type flip flop, (14) photoelectrical coupler, (15) low-pass filter, (16)+5
V± 6
V+ 9
VPower supply, (17) AC/DC convertor, (18) bridge circuit high-voltage power supply 1200
V, (19) tested cable, (20) special inductive coil of wire, (21) switch, (22) computing is placed on device 7650, (23) magnetic jar, (24) inductance coil of wire.
Claims (2)
1, a kind of comprehensive tester that detects the cable cores fault, by precision type bridge circuit (1), high precision measurement circuit (2), electric capacity, voltage transitions metering circuit (3), interface (6), single-chip microcomputer treatment circuit formations such as (7), it is characterized in that: measure the cable core defective insulation, swinging cross, the A of precision type bridge circuit (1), the tested cable of B termination, measuring-signal is delivered to single-chip microcomputer treatment circuit (7) through (1), measuring amplifier (4), analog to digital converter (5), interface (6); In precision type bridge circuit (1), a of the special inductive coil of wire (20) holds through switch (21) connecting resistance R
2, R
1, C
1, R
3, form an electric bridge brachium pontis by five parts, the b termination C of (20) another winding
2, R
4, form an electric bridge brachium pontis by three parts, two brachium pontis are respectively R in addition
5And R
6, the bridge balance detection signal has opposite polarity two diode D of access in parallel and two series capacitance C through V+, V_ output between V+, the V_
3, 5 input ends of operational amplifier (22) are sent in output respectively, and the output of (22) connects 4,5 ends of next stage operational amplifier (22) again through R-C coupling, and the input end of analog to digital converter (5) is sent in its output.
2, comprehensive tester according to claim 1 is characterized in that: the tester special inductive coil of wire (20), and adopt 4 lines and be 0.12mm around, line footpath φ, the number of turn is 270 circles, L
1=L
2=L
3=L
4=1.55H, magnetic jar diameter phi is 26mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93219349 CN2166463Y (en) | 1993-07-24 | 1993-07-24 | Integral tester for failure of communication cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93219349 CN2166463Y (en) | 1993-07-24 | 1993-07-24 | Integral tester for failure of communication cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2166463Y true CN2166463Y (en) | 1994-05-25 |
Family
ID=33798757
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93219349 Expired - Fee Related CN2166463Y (en) | 1993-07-24 | 1993-07-24 | Integral tester for failure of communication cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2166463Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102269791A (en) * | 2011-04-27 | 2011-12-07 | 兰州交通大学 | Online monitoring and positioning method of railway signal cable disconnection fault |
| CN105044553A (en) * | 2015-06-25 | 2015-11-11 | 邵珠真 | Underground power cable fault distance measuring device |
| CN106443351A (en) * | 2016-11-02 | 2017-02-22 | 南京工程学院 | System and method for detecting faults of multi-core cables of ships |
-
1993
- 1993-07-24 CN CN 93219349 patent/CN2166463Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102269791A (en) * | 2011-04-27 | 2011-12-07 | 兰州交通大学 | Online monitoring and positioning method of railway signal cable disconnection fault |
| CN102269791B (en) * | 2011-04-27 | 2013-09-04 | 兰州交通大学 | Online monitoring and positioning method of railway signal cable disconnection fault |
| CN105044553A (en) * | 2015-06-25 | 2015-11-11 | 邵珠真 | Underground power cable fault distance measuring device |
| CN105044553B (en) * | 2015-06-25 | 2018-02-09 | 邵珠真 | Underground power cable fault location device |
| CN106443351A (en) * | 2016-11-02 | 2017-02-22 | 南京工程学院 | System and method for detecting faults of multi-core cables of ships |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |