Homosequence specific phase frequency measurement method and high accuracy frequency meter

A phase comparison and frequency measurement technology, used in frequency measurement and frequency meter fields, to achieve high frequency measurement accuracy, simple equipment lines, and improved frequency measurement resolution.

Inactive Publication Date: 2003-04-16
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is how to overcome the adverse effects caused by the phase detection error in the phase detection broadband frequency measurement technology, so as to further improve the frequency measurement accuracy

Method used

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  • Homosequence specific phase frequency measurement method and high accuracy frequency meter
  • Homosequence specific phase frequency measurement method and high accuracy frequency meter
  • Homosequence specific phase frequency measurement method and high accuracy frequency meter

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Embodiment Construction

[0013] The invention improves the phase detection broadband frequency measurement technology. The applicant found in the application of phase detection broadband frequency measurement technology that due to the randomness of the phase detection timing between the signal to be tested and the standard signal, the consistency between the phase coincidence signal of the door opening and the phase coincidence signal of the door closing is not good, thus affecting the frequency measurement accuracy . The present invention improves on the above-mentioned defects, and is characterized in that its frequency measurement method is: firstly, the signal to be measured f x with the standard frequency signal f 0 The sequence processing is carried out through the sequence circuit, so that the output f x and f 0 A defined timing relationship is always maintained during the pre-opening of the counter gate. Then, with the cooperation of the single-chip time base circuit (or hardware time bas...

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Abstract

The characteristics of the invention are as follows. The homotactic treatment is carried out for the signal fx to be measured and the standard frequency signal fo. The pulse sense signal with f phases being accord with each other is generated by the phase comparison circuit to control the staring and closing the strobe of the counter x and fo. The Nx and No multiple periodic quantity of fx and foare recorded in the opening time of the strobe of the counter x. Further, the fx canbe calculated from the formula fx=(Nx / No)fo. Based no the said method, the frequency meter designed is composed of the ordered circuit, the phase comparison circuit, the conditioning circuit, and the single chip etc. The invention possesses the features of good consistency of the phase coincidence signal, suitablefor wide frequency range and high resolution of the frequency to be measured.

Description

Technical field: [0001] The invention relates to the technical field of electronics and frequency measurement, in particular to a frequency measurement method and a frequency meter designed using the method. Background technique: [0002] Due to the inherent counting error of ±1Hz of the general electronic counter, the frequency measurement accuracy of the common frequency meter is severely limited, generally 10 -7 ~10 -8 order of magnitude. Although some special technologies are used: such as multi-cycle synchronization technology, interpolation technology, time interval averaging technology, digital cursor technology, etc., the measurement accuracy can only reach 10 -10 order of magnitude. At the same time, these test principles and test circuits are relatively complex, which requires high performance indicators of components, and the cost has also increased significantly. The use of error multiplication technology not only increases noise and equipment, but also can o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/02
Inventor 陈小林王祝盈谢中
Owner HUNAN UNIV
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