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Method for improving accuracy of timing of quartz timer

A timekeeping and timer technology, applied to electronic timers, devices for measuring time intervals, changing time indications, etc., can solve the problems of demanding crystal quality, cumbersome operation process, and high cost, and achieve lower quality requirements and less system Time error, the effect of accurate time display

Inactive Publication Date: 2013-04-10
FUJIAN METROLOGY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, for equipment with high time accuracy requirements, the crystal quality requirements are very strict, so the cost is relatively high; in addition, the existing time calibration methods are to eliminate errors by synchronizing with the standard clock every day. The process is cumbersome, and manual operation will inevitably cause certain mistakes

Method used

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Examples

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Embodiment 1

[0027] For a finished temperature and humidity meter with a perpetual calendar function, the daily error value of the time is +0.92s measured with an instantaneous day difference meter; the correction value stored in the register is 0.92s; at the same time, the calibration time point is set to 23:59:59 Second;

[0028] The re-set calibration time interval value is 5 days or 120 hours, that is, the time of the clock chip is automatically corrected every 5 days. The corrected time value on the fifth day is 0.92*5=4.60s. The corrected value is rounded to keep two significant figures, then At 23:59:59 on the fifth day, the MCU will re-correct the initial count value of the clock chip, that is, add 4.6s to the time value displayed in the next second; after the next calibration time interval of 5 days, continue to perform automatic calibration.

[0029] Since the cumulative error of 5 days is 0.92*5=4.60s, the corrected time value on the 5th day is 0.9*5=4.6s, and the time error is ...

Embodiment 2

[0031] Take a finished quartz crystal timer as an example: the frequency deviation of the finished quartz crystal timer is 32kHz crystal oscillator with 1PPM, that is, the frequency error in the working environment Δf=(f*frequency deviation) / 10 6 =(32*10 3 *1) / 10 6 =32*10 -3 Hz, where f is the frequency of the crystal oscillator; then the daily error corresponding to the finished timer made of the crystal oscillator is ±(1*24*60*60) / 10 6 =±0.0864s, assuming that the crystal oscillator constitutes a finished timer with a positive error and the true value of the daily error is +0.0864s under the influence of external conditions, the resulting true annual error value is (+0.0864s)*365=+ 31.536s.

[0032] The finished quartz crystal timer is tested with an instantaneous solar difference meter with an accuracy better than 0.4PPM, and the measured daily error value is +0.09s; therefore, the annual error value that needs to be corrected is (+0.09s)*365=+32.85 s. The annual error...

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Abstract

The invention provides a method for improving the accuracy of timing of a quartz timer, which comprises the following steps of measuring the finished product quartz timer under a working condition by using an instantaneous daily rate measuring instrument to acquire a time daily error value of the quartz timer; setting a calibration time point, a time daily error value and a calibration time internal value in an MCU (micro controller unit) of the quartz timer; and at last, reallocating initial timing of a clock chip according to the time daily error value. The method makes time calibration of the high-precision quartz timer more accurate and convenient, can avoid errors produced by manual operation, meanwhile effectively reduces cost and has significant social economic benefits.

Description

【Technical field】 [0001] The invention relates to a method for improving the timekeeping accuracy of a quartz timer. 【Background technique】 [0002] Quartz electronic watch is an electronic timer widely used in various industries and our daily life, hereinafter referred to as electronic watch. The daily difference of the electronic watch is the timing error of the continuous travel time of the electronic watch for 24 hours, and the instantaneous daily difference is the timing error of measuring the travel time error of the electronic watch at a certain time interval converted to 24 hours, and its unit is s, ms, etc. The daily difference is an important indicator for evaluating the speed of a clock and reflecting its quality. A clock runs faster or slower relative to a standard clock, depending on the frequency of the master oscillator used. If the actual value of its frequency is higher than the nominal value, it will run fast, otherwise it will run slowly. The homeopathi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G04F5/00G04G5/00
Inventor 林军许航方辉黄志煌吕丹卓晓丹
Owner FUJIAN METROLOGY INST
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