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Device and method for detecting long term frequency stability of clock

A technology of frequency stability and clock, which is applied in the field of computer communication, can solve problems such as difficult to guarantee test accuracy, unintuitive test results, cumbersome test methods, etc., and achieve the effect of improving test automation level, intuitive test results, and scientific test results

Inactive Publication Date: 2005-08-03
SHANGHAI HUAWEI TECH CO LTD
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

Therefore, the long-term clock frequency test method adopted in the prior art cannot regularly collect, process, count and draw the frequency stability curve in real time; and the test method is cumbersome, the sampling data is not enough, and the test results are not intuitive Difficult to guarantee high test accuracy

Method used

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  • Device and method for detecting long term frequency stability of clock
  • Device and method for detecting long term frequency stability of clock
  • Device and method for detecting long term frequency stability of clock

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Embodiment Construction

[0027] The invention is used for long-term testing of the frequency of a high-precision clock, draws the frequency stability curve of the clock in real time according to the sampled data, and records the maximum and minimum frequency deviation values ​​of the clock signal to be tested.

[0028] The device for testing clock long-term frequency stability of the present invention is as figure 1 , figure 2 As shown, the specific structure includes:

[0029] Frequency meter: used to receive the clock signal to be tested, and after testing the frequency of the clock signal to be tested, output the measured value to the data acquisition and processing module; and the reference clock of the frequency meter uses a clock that tracks the rubidium frequency standard to ensure the frequency Accuracy of stability measurement; the frequency meter used is HP53132 frequency meter whose clock accuracy is an order of magnitude higher than that under SDH hold mode;

[0030] Data acquisition an...

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Abstract

The present invention is the device and method of detecting long term frequency stability of clock. The device includes frequency meter to receive detected clock, data acquisition module and data processing output module, and the data acquisition and processing module and the data processing output module are set inside computer and connected to the frequency meter via the serial port. The method includes acquiring with the frequency meter the tested clock signal and measuring its frequency; sending the tested frequency value to the data acquisition and processing module for calculation and processing regularly; and processing the frequency data comprehensively in the data processing output module and displaying output figure and historical data. The present invention makes it possible for the user to understand the frequency stability of the tested clock.

Description

technical field [0001] The invention relates to the technical field of computer communication, in particular to a device and method for testing the long-term frequency stability of a clock. Background technique [0002] SDH (Synchronous Transmission Series) equipment is currently the main telecommunication transmission equipment. One of the most important features of this type of equipment is based on clock synchronization. Its clock module has three working modes: tracking, hold and free oscillation. According to the ITU (International Telecommunication Union ) Relevant suggestions require that the maximum frequency deviation of the SDH clock in the hold mode cannot be greater than 0.37ppm, and the maximum frequency deviation in the free oscillation mode cannot be greater than 4.6ppm. [0003] In view of the above requirements and the needs of practical applications, an important test item when testing equipment is to conduct long-term tests (greater than or equal to 24 hou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/02G04F10/08G06F17/00
Inventor 李彪
Owner SHANGHAI HUAWEI TECH CO LTD
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