CN102607395A - Coaxial cable length measuring system - Google Patents
Coaxial cable length measuring system Download PDFInfo
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- CN102607395A CN102607395A CN201210087764XA CN201210087764A CN102607395A CN 102607395 A CN102607395 A CN 102607395A CN 201210087764X A CN201210087764X A CN 201210087764XA CN 201210087764 A CN201210087764 A CN 201210087764A CN 102607395 A CN102607395 A CN 102607395A
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Abstract
The invention discloses a coaxial cable length measuring system, which comprises a microprocessor module, a display circuit, a key circuit and a length/frequency conversion circuit, wherein the display circuit and the key circuit are respectively connected with the microprocessor module; the length/frequency conversion circuit is provided with two cable joints used for being connected with the two ends of a coaxial cable and a shielded grounding joint used for being connected with a shielded joint of the coaxial cable; and an output end of the length/frequency conversion circuit is connected with the microprocessor module. According to the coaxial cable length measuring system, the length/frequency conversion circuit is adopted to convert cable length data to frequency signals in proportion to length, so the measurement of coaxial cables made of different material or tests with different requirements can be completed; and the coaxial cable length measuring system has the advantages of higher generality and practical value, steadiness in operation, accuracy and reliability in measurement and good application prospect.
Description
Technical field
The present invention relates to the power engineering monitoring technical field, be specifically related to a kind of concentric cable length measuring system.
Background technology
In real work, often need measure physical length, relative length, equivalent length of concentric cable etc. accurately.Because when directly surveying length,, cause and measure inaccurate or, suitable directly measurement because cable is very long because cable inconvenience is stretching with chi.When using electric signal that cable is measured, because electric signal is propagated on stub cable, the time compole that is experienced is short, generally 10
-9S ~ 10
-7In the s scope, so will accomplish very difficulty of accurate measurement.
Summary of the invention
The physical length that the objective of the invention is in order to overcome measurement concentric cable in the prior art is difficult, and the not high problem of measuring accuracy.
In order to solve the problems of the technologies described above, the technical scheme that the present invention adopted is:
A kind of concentric cable length measuring system; Comprise microprocessor module, display circuit and key circuit; Said display circuit, key circuit are connected with microprocessor module respectively; It is characterized in that: also comprise the length/frequency conversion circuit; Said length/frequency conversion circuit is provided with two cable splices that are used for being connected with the two ends of concentric cable and the bonding joint that is used for being connected with the shielded joint of concentric cable, and the output terminal of said length/frequency conversion circuit is connected with microprocessor module.
Aforesaid concentric cable length measuring system is characterized in that: also comprise indicating circuit, watchdog circuit and power circuit, said indicating circuit, watchdog circuit and power circuit are connected with microprocessor module respectively.
Aforesaid concentric cable length measuring system; It is characterized in that: said length/frequency conversion circuit also comprises first Technitron and second Technitron; The collector of said first Technitron is connected with one of them cable splice; Be provided with electric capacity between the base stage of said first Technitron and second Technitron; And be connected with another cable interface jointly, the emitter of said first Technitron and second Technitron, bonding joint are connected with ground jointly, and the collector of said second Technitron is connected with microprocessor module as the output terminal of length/frequency conversion circuit.
Aforesaid concentric cable length measuring system is characterized in that: the collector of said first Technitron, second Technitron also is connected with high level through resistance respectively with the base stage of second Technitron.
The invention has the beneficial effects as follows: the present invention adopts the length/frequency conversion circuit; Cable length is transformed into and the proportional frequency signal of length, and microprocessor module carries out the length of measurements and calculations cable to this frequency signal, and the result is passed through the display demonstration export; Can also be through key circuit input correlation parameter; Completion is to the measurement of the concentric cable of unlike material or accomplish the test of demands of different, has high generality and practical value, and working stability; Measure accurately and reliably, have a good application prospect.
Description of drawings
Fig. 1 is the system chart of concentric cable length measuring system of the present invention.
Fig. 2 is the schematic diagram of length/frequency conversion circuit of the present invention.
Embodiment
To combine Figure of description below, the present invention will be further described.
Like Fig. 1 and shown in Figure 2; A kind of concentric cable length measuring system; Comprise microprocessor module, display circuit, key circuit and length/frequency conversion circuit; Said display circuit, key circuit are connected with microprocessor module respectively, and said length/frequency conversion circuit is provided with two cable splice A and the B that is used for being connected with the two ends of concentric cable, is used for the bonding joint C that is connected with the shielded joint of concentric cable; The output terminal D of said length/frequency conversion circuit is connected with microprocessor module; Wherein display circuit is used to show the information such as physical length, relative length, equivalent length of the concentric cable that measures, and key circuit is used to import correlation parameter, accomplishes the measurement of the concentric cable of unlike material or accomplishes the test of demands of different; The length/frequency conversion circuit is used for cable length is transformed into and the proportional frequency signal of length; Input to microprocessor module and handle, bonding joint C is used to shield external electric signal to be disturbed, and improves the degree of accuracy of measuring.
The concentric cable length measuring system also comprises indicating circuit, watchdog circuit and power circuit; Said indicating circuit, watchdog circuit and power circuit are connected with microprocessor module respectively; Indicating circuit is used to point out the duty of this measurement mechanism of survey crew; Comprise two pilot lamp, device was in proper working order when green light lighted, device operation irregularity when red light lights.Misoperation causes in the time of possibly being the button input; Power circuit is used for working power to microprocessor module being provided; Watchdog circuit is used for anti-locking apparatus in use; Device is restarted in unexpected collapse (such as electrostatic interference and other bad working environment), guarantees the operate as normal of concentric cable length measuring system.
Said length/frequency conversion circuit also comprises the first Technitron Q1 and the second Technitron Q2; The collector of the said first Technitron Q1 is connected with one of them cable splice A; Be provided with capacitor C 1 between the base stage of the said first Technitron Q1 and the second Technitron Q2; And be connected with another cable interface B jointly; The emitter of the said first Technitron Q1 and the second Technitron Q2, bonding joint C are connected with ground jointly; The collector of the said second Technitron Q2 is connected with microprocessor module as the output terminal D of length/frequency conversion circuit; The collector of the said first Technitron Q1, the second Technitron Q2 and the base stage of the second Technitron Q2 also are connected through resistance R 1 (size can be 330 Europe), R2 (size can be 12 kilo-ohms) and R3 (size can be 800 Europe) and high level (for positive 5 volts) respectively, and wherein can to select model for use be the 2SC3358 triode for Technitron Q1 and Q2, and capacitor C 1 size is 0.1F.
The concrete course of work of the present invention is following: the heart yearn at measured concentric cable two ends meets cable splice A and B respectively; The shielding of cable connects electronic circuit and is connected with ground jointly with bonding joint C, and when Technitron Q1 current collection very during high level, high level signal is sent to the base stage of Q1 by concentric cable elapsed-time standards t; Make the quick conducting of Q1; The collector of Q1 becomes low level, and this low level is sent to the base stage of Q1 by concentric cable elapsed time t, and transistor Q1 ends fast; In transistor Q1 circuit, produce pulse width is the square wave of t like this, and the cycle of square wave is T=2t.The length of concentric cable is long more, and the cycle of square wave is long more, and cable length is directly proportional with the cycle of square wave, i.e. L=KT.And frequency is f=1/T; L=K/f then; Microprocessor module is through after handling the square-wave signal of importing; Just can obtain the length of respective coaxial cables, and show through display circuit, survey crew can also be selected the measurement of the concentric cable of unlike material or accomplishes the test of demands of different through button.
In sum, the present invention adopts the length/frequency conversion circuit, and cable length is transformed into and the proportional frequency signal of length; Microprocessor module carries out the length of measurements and calculations cable to this frequency signal; And the result is passed through the display demonstration export, can also be through key circuit input correlation parameter, the test of demands of different is perhaps accomplished in completion to the measurement of the concentric cable of unlike material; Have high generality and practical value; And working stability is measured accurately and reliably, has a good application prospect.
More than show and described ultimate principle of the present invention, principal character and advantage.The technician of the industry should understand; The present invention is not restricted to the described embodiments; That describes in the foregoing description and the instructions just explains principle of the present invention; Under the prerequisite that does not break away from spirit and scope of the invention, the present invention also has various changes and modifications, and these variations and improvement all fall in the scope of the invention that requires protection.The present invention requires protection domain to be defined by appending claims and equivalent thereof.
Claims (4)
1. concentric cable length measuring system; Comprise microprocessor module, display circuit and key circuit; Said display circuit, key circuit are connected with microprocessor module respectively; It is characterized in that: also comprise the length/frequency conversion circuit; Said length/frequency conversion circuit is provided with two cable splices that are used for being connected with the two ends of concentric cable and the bonding joint that is used for being connected with the shielded joint of concentric cable, and the output terminal of said length/frequency conversion circuit is connected with microprocessor module.
2. concentric cable length measuring system according to claim 1 is characterized in that: also comprise indicating circuit, watchdog circuit and power circuit, said indicating circuit, watchdog circuit and power circuit are connected with microprocessor module respectively.
3. concentric cable length measuring system according to claim 1 and 2; It is characterized in that: said length/frequency conversion circuit also comprises first Technitron and second Technitron; The collector of said first Technitron is connected with one of them cable splice; Be provided with electric capacity between the base stage of said first Technitron and second Technitron; And be connected with another cable interface jointly, the emitter of said first Technitron and second Technitron, bonding joint are connected with ground jointly, and the collector of said second Technitron is connected with microprocessor module as the output terminal of length/frequency conversion circuit.
4. concentric cable length measuring system according to claim 3 is characterized in that: the collector of said first Technitron, second Technitron also is connected with high level through resistance respectively with the base stage of second Technitron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210087764XA CN102607395A (en) | 2012-03-29 | 2012-03-29 | Coaxial cable length measuring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210087764XA CN102607395A (en) | 2012-03-29 | 2012-03-29 | Coaxial cable length measuring system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102607395A true CN102607395A (en) | 2012-07-25 |
Family
ID=46525007
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210087764XA Pending CN102607395A (en) | 2012-03-29 | 2012-03-29 | Coaxial cable length measuring system |
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| CN (1) | CN102607395A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104949606A (en) * | 2015-05-19 | 2015-09-30 | 苏州市职业大学 | Length measuring device for twisted-pair data cables and method for applying length measuring device |
| CN114137276A (en) * | 2021-11-05 | 2022-03-04 | 中国电力工程顾问集团西南电力设计院有限公司 | Method for calculating induction voltage of unequal-interval segmented high-voltage cable |
Citations (6)
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|---|---|---|---|---|
| CN2035076U (en) * | 1988-04-26 | 1989-03-29 | 黄石机械自动化研究所 | Cable length intelligent measure instrument |
| CN1080995A (en) * | 1993-01-06 | 1994-01-19 | 北京振兴计量控制技术开发公司 | Cable length measuring method |
| CN1143178A (en) * | 1995-08-14 | 1997-02-19 | 薛茂林 | Cable distance measuring method equipment |
| CN101709947A (en) * | 2009-05-22 | 2010-05-19 | 北京荣达千里科技有限公司 | Method for testing length of cable |
| CN202066473U (en) * | 2011-04-02 | 2011-12-07 | 郭占山 | Tester of cable length |
| CN202547582U (en) * | 2012-03-29 | 2012-11-21 | 江苏三通仪器系统有限公司 | Length measuring system of coaxial cable |
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2012
- 2012-03-29 CN CN201210087764XA patent/CN102607395A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2035076U (en) * | 1988-04-26 | 1989-03-29 | 黄石机械自动化研究所 | Cable length intelligent measure instrument |
| CN1080995A (en) * | 1993-01-06 | 1994-01-19 | 北京振兴计量控制技术开发公司 | Cable length measuring method |
| CN1143178A (en) * | 1995-08-14 | 1997-02-19 | 薛茂林 | Cable distance measuring method equipment |
| CN101709947A (en) * | 2009-05-22 | 2010-05-19 | 北京荣达千里科技有限公司 | Method for testing length of cable |
| CN202066473U (en) * | 2011-04-02 | 2011-12-07 | 郭占山 | Tester of cable length |
| CN202547582U (en) * | 2012-03-29 | 2012-11-21 | 江苏三通仪器系统有限公司 | Length measuring system of coaxial cable |
Non-Patent Citations (1)
| Title |
|---|
| 李涛等: "同轴电缆长度的测量", 《航空计测技术》, vol. 24, no. 3, 30 June 2004 (2004-06-30) * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104949606A (en) * | 2015-05-19 | 2015-09-30 | 苏州市职业大学 | Length measuring device for twisted-pair data cables and method for applying length measuring device |
| CN104949606B (en) * | 2015-05-19 | 2018-01-05 | 苏州市职业大学 | A kind of data length of twisted pair measurement apparatus and application method |
| CN114137276A (en) * | 2021-11-05 | 2022-03-04 | 中国电力工程顾问集团西南电力设计院有限公司 | Method for calculating induction voltage of unequal-interval segmented high-voltage cable |
| CN114137276B (en) * | 2021-11-05 | 2023-08-18 | 中国电力工程顾问集团西南电力设计院有限公司 | Calculation method for induction voltage of unequal-interval segmented high-voltage cable |
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Application publication date: 20120725 |