CN202385068U - High-precision cable transmission time delay measuring instrument - Google Patents
High-precision cable transmission time delay measuring instrument Download PDFInfo
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- CN202385068U CN202385068U CN 201120476225 CN201120476225U CN202385068U CN 202385068 U CN202385068 U CN 202385068U CN 201120476225 CN201120476225 CN 201120476225 CN 201120476225 U CN201120476225 U CN 201120476225U CN 202385068 U CN202385068 U CN 202385068U
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Abstract
The utility model discloses a high-precision cable transmission time delay measuring instrument, comprising an emission pulse generator generating a pulse signal. The emission pulse generator is connected with a sample hold circuit via a coupling network, the sample hold circuit is connected with a sampling pulse generator used for providing a sampling pulse signal, and the output end of the sample hold circuit is connected with a filtering amplification circuit, an AD sampling circuit and a processor orderly. The processor computes and obtains the transmission time delay of a to-be-measured cable according to an output signal come from the AD sampling circuit, and also comprises a clock module used for supplying the emission pulse generator, a sampling pulse generator and the processor with clock sources . By simulating a under-sampling technology, the high-precision cable transmission time delay measuring instrument of the utility model enables the time domain amplification measurement to be realized and the system measurement precision to be improved. When the measuring instrument is used, users can select an internal clock unit or an external clock unit to provide the clock source to measure the transmission time delay of the to-be-measured cable.
Description
Technical field
The utility model relates to the high accuracy propagation delay time and measures and the split-second precision field of synchronization especially a kind of high accuracy cable transmission latency measurement appearance.
Background technology
Wait the field synchronously at split-second precision, need accurately to measure the propagation delay time of cable.In the past, often adopted cable length mensuration or pulse otdr measurement method to measure the propagation delay time of cable.The cable length mensuration, as the term suggests be length through accurate measurement cable, then through calculating the propagation delay time that obtains cable.This method can obtain higher certainty of measurement, but cable is long more under the short situation of cable (below 1 meter), precision is low more, and this method can not be used to connect up, and the back is measured, the automaticity of measurement is lower.Therefore, this method is used less in practice.Pulse otdr measurement method is to use a kind of very widely propagation delay time mensuration; This method is utilized pulse Time Domain Reflectometry principle; The time interval through direct measurement transmitted pulse and reflected impulse obtains the propagation delay time of cable, and the certainty of measurement of propagation delay time receives the restriction of time interval measurement precision.High-precision measurement need realize by complicacy, expensive high precision time interval counter.
The utility model content
The technical problem that the utility model will solve is: a kind of high accuracy cable transmission latency measurement appearance of owing Sampling techniques based on simulation is provided.
In order to solve the problems of the technologies described above, the technical scheme that the utility model adopted is:
A kind of high accuracy cable transmission latency measurement appearance; Comprise the transmitted pulse maker that produces pulse signal; Said transmitted pulse maker is connected with sampling hold circuit through coupling network; Said sampling hold circuit connects promising its provides the sampling pulse maker of sampling pulse signal; The output of said sampling hold circuit is connected with filter amplification circuit, AD sample circuit and processor in turn, and said processor comprises also that according to the propagation delay time that draws cable under test from the output calculated signals of AD sample circuit is respectively the clock module that said transmitted pulse maker, sampling pulse maker and processor provide the clock source.
Further as preferred embodiment, said clock module comprises internal clocking unit and external clock unit, the input circuit that the input of said processor is connected with the transmitted pulse clock is set, adopts pulse clock and processor work clock.
Further as preferred embodiment, said internal clocking unit is full synchronised clock unit.
Further as preferred embodiment, the output of said processor is connected with the display circuit that shows the cable under test propagation delay time.
The beneficial effect of the utility model is: the utility model high accuracy cable transmission latency measurement appearance has been realized the time domain measurement by magnification through adopting simulation to owe Sampling techniques; Improved the certainty of measurement of system; When using this measuring instrument, the user can select to adopt internal clocking unit or external clock unit to provide the clock source to come the propagation delay time of cable under test is measured.
Description of drawings
Be described further below in conjunction with the embodiment of accompanying drawing the utility model:
Fig. 1 is the theory diagram of the utility model high accuracy cable transmission latency measurement appearance;
Fig. 2 is the theory diagram of the utility model high accuracy cable transmission latency measurement appearance embodiment two.
Embodiment
The utility model high accuracy cable transmission latency measurement appearance; Utilize the fixing characteristic of cable length, owe Sampling techniques, realized the measurement by magnification of time domain in conjunction with simulation; To carrying out the height analog-to-digital conversion through the time domain amplifying signal; And the combined digital signal treatment technology, not only high-precision propagation delay time can be obtained, but also the propagation delay time of cable can be accurately reflected.
With reference to Fig. 1; A kind of high accuracy cable transmission latency measurement appearance; Comprise the transmitted pulse maker 2 that produces pulse signal; Said transmitted pulse maker 2 is connected with sampling hold circuit 5 through coupling network 4; Said sampling hold circuit 5 connects promising its provides the sampling pulse maker 3 of sampling pulse signal; The output of said sampling hold circuit 5 is connected with filter amplification circuit 6, AD sample circuit 7 and processor 8 in turn, and said processor 8 is according to the propagation delay time that draws cable under test from the output calculated signals of AD sample circuit 7, comprises that also is respectively the clock module 1 that said transmitted pulse maker 2, sampling pulse maker 3 and processor 8 provide the clock source.
Embodiment one:
With reference to Fig. 1, clock module 1 is full synchronised clock unit, and this full synchronised clock unit provides all synchro transmitted pulse clock
f T , the sampling pulse clock
f S , the system works clock
f Sys , transmitted pulse clock wherein
f T With the sampling pulse clock
f S Have less difference on the frequency, this frequency difference in 0.1Hz ~ 50Hz scope, the transmitted pulse clock
f T In 100KHz ~ 20MHz scope.Transmitted pulse maker 2 produces the nanosecond burst pulse, and this pulse is coupled into cable under test and sampling hold circuit 5 through coupling network 4, and pulse produces reflection at the other end of cable under test, and reflected impulse also enters into sampling hold circuit 5.Sampling pulse maker 3 produces ns magnitude sampling pulses, and the maintenance of sampling of control sampling hold circuit 5, for follow-up analog-to-digital conversion.Sampling keeps 5 result after filter amplification circuit 6 is handled, and sends into AD sample circuit 7 and carries out analog-to-digital conversion.Processor 8 calculates the propagation delay time of pulse according to the result of AD sample circuit 7, and further extrapolates the propagation delay time of cable.The precision of measuring is relevant with the frequency of the frequency difference of exomonental frequency, transmitted pulse frequency and sampling pulse frequency, AD sampling pulse.
Embodiment two:
With reference to Fig. 2; Clock module 1 comprises internal clocking unit and external clock unit in the present embodiment; The input circuit 10 that the input of processor 8 is connected with the transmitted pulse clock is set, adopts pulse clock and processor work clock, the output of processor 8 is connected with the display circuit 9 that shows the cable under test propagation delay time.
The internal clocking unit provides all synchro transmitted pulse clock
f T , the sampling pulse clock
f S , the system works clock
f Sys , for example
f T =1,000,000Hz;
f S =1,000,001Hz,
f Sys =10,000,000Hz.
The user can select to use internal clocking or external clock.When using external clock, the external emission pulse clock is set through input circuit 10
f T , , outside sampling pulse clock
f S , , the external system work clock
f Sys , , processor 8 promptly can accurately calculate the propagation delay time of cable under test according to external clock.
More than be that preferable enforcement to the utility model specifies; But the utility model is created and is not limited to said embodiment; Those of ordinary skill in the art can also make all equivalent variations or replacement under the prerequisite of the utility model spirit, distortion that these are equal to or replacement all are included in the application's claim institute restricted portion.
Claims (4)
1. high accuracy cable transmission latency measurement appearance; It is characterized in that: comprise the transmitted pulse maker (2) that produces pulse signal; Said transmitted pulse maker (2) is connected with sampling hold circuit (5) through coupling network (4); Said sampling hold circuit (5) connects promising its provides the sampling pulse maker (3) of sampling pulse signal; The output of said sampling hold circuit (5) is connected with filter amplification circuit (6), AD sample circuit (7) and processor (8) in turn; Said processor (8) comprises also that according to the propagation delay time that draws cable under test from the output calculated signals of AD sample circuit (7) is respectively the clock module (1) that said transmitted pulse maker (2), sampling pulse maker (3) and processor (8) provide the clock source.
2. a kind of high accuracy cable transmission latency measurement appearance according to claim 1; It is characterized in that: said clock module (1) comprises internal clocking unit and external clock unit, the input circuit (10) that the input of said processor (8) is connected with the transmitted pulse clock is set, adopts pulse clock and processor work clock.
3. a kind of high accuracy cable transmission latency measurement appearance according to claim 1, it is characterized in that: said internal clocking unit is full synchronised clock unit.
4. according to claim 2 or 3 described a kind of high accuracy cable transmission latency measurement appearance, it is characterized in that: the output of said processor (8) is connected with the display circuit (9) that shows the cable under test propagation delay time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120476225 CN202385068U (en) | 2012-04-23 | 2012-04-23 | High-precision cable transmission time delay measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120476225 CN202385068U (en) | 2012-04-23 | 2012-04-23 | High-precision cable transmission time delay measuring instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202385068U true CN202385068U (en) | 2012-08-15 |
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ID=46633538
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120476225 Expired - Fee Related CN202385068U (en) | 2012-04-23 | 2012-04-23 | High-precision cable transmission time delay measuring instrument |
Country Status (1)
| Country | Link |
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| CN (1) | CN202385068U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109688345A (en) * | 2018-12-18 | 2019-04-26 | 广州励丰文化科技股份有限公司 | A kind of media server performance control system and method based on timing code driving |
| CN113009201A (en) * | 2021-02-24 | 2021-06-22 | 普源精电科技股份有限公司 | Electric signal sampling device |
-
2012
- 2012-04-23 CN CN 201120476225 patent/CN202385068U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109688345A (en) * | 2018-12-18 | 2019-04-26 | 广州励丰文化科技股份有限公司 | A kind of media server performance control system and method based on timing code driving |
| CN113009201A (en) * | 2021-02-24 | 2021-06-22 | 普源精电科技股份有限公司 | Electric signal sampling device |
| CN113009201B (en) * | 2021-02-24 | 2022-08-23 | 普源精电科技股份有限公司 | Electric signal sampling device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120815 Termination date: 20210423 |