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Method for adjusting and calibrating crystal oscillator frequency of intelligent electric meter based on exhaustion

A crystal oscillator frequency and smart meter technology, which is applied in the direction of measuring electrical variables, measuring devices, instruments, etc., can solve the problems of insufficient matching of a single analytical formula, achieve significant adjustment effects, improve pass rate, and reduce adjustment costs.

Active Publication Date: 2022-03-11
SHENZHEN FRIENDCOM TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method for adjusting the frequency of the smart meter crystal oscillator based on exhaustion, so as to solve the technical problem that the temperature characteristic compensation curve of the meter crystal oscillator in the above-mentioned prior art has insufficient matching degree of a single analytical formula

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  • Method for adjusting and calibrating crystal oscillator frequency of intelligent electric meter based on exhaustion
  • Method for adjusting and calibrating crystal oscillator frequency of intelligent electric meter based on exhaustion
  • Method for adjusting and calibrating crystal oscillator frequency of intelligent electric meter based on exhaustion

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Embodiment 1

[0069] like Figure 5-8 As shown, the present invention provides a method for adjusting the frequency of the smart meter crystal oscillator based on exhaustion, including the following steps:

[0070] S11. Collect the temperature of the smart meter and the frequency of the crystal oscillator under the temperature in each test temperature range. The clock test tool continuously collects the temperature and crystal oscillator frequency of the smart meter in the six test temperature ranges described below, and the crystal oscillator frequency corresponds to the temperature one by one. Specifically, the clock test tool adopts the scanning method to collect, that is, specify the initial temperature and target temperature, and then specify the time length of the incubator from the initial temperature to the target temperature, then the tool will continue to measure the temperature and frequency within this period of time. collection. For example, if it is specified that the heatin...

Embodiment 2

[0160] like Figure 11-13 As shown, this embodiment provides the specific application based on the method of Embodiment 1. The clock test tool continuously collects 280 data in the temperature range of -28°C-65°C, that is, referring to the amount of data collected in Embodiment 1 Method, according to the lowest temperature and the highest temperature in the temperature range, specify the starting temperature as -28°C, the target temperature as 65°C, the total heating time of 25 watches is about 70 hours, and the clock test tooling has 5 channels to collect concurrently, and the collected ( temperature, crystal oscillator frequency) is 280 pairs, and the time for each group to collect a pair of data is 3 minutes, as the basic data of the fitting of this implementation;

[0161] After calculating the temperature drift error, filtering, subsection fitting and crystal oscillator frequency compensation for the data, a significant compensation effect has been obtained. It can be cl...

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Abstract

The invention discloses an intelligent electric meter crystal oscillator frequency adjustment and calibration method based on exhaustion, relates to the technical field of metering equipment, and solves the technical problem that a temperature characteristic compensation curve of an existing electric meter crystal oscillator is insufficient in single analytic expression matching degree. The method comprises the following steps: S11, acquiring the temperature of the intelligent electric meter and the crystal oscillator frequency at the temperature in each test temperature interval; s12, calculating a temperature drift error according to the collected crystal oscillator frequency; s13, respectively filtering the temperature error and the temperature drift error; s14, taking the filtered temperature as an independent variable and the temperature drift error as a dependent variable, and adopting an exhaustion method to carry out piecewise fitting to obtain an analytic expression coefficient of each section; and S15, writing the obtained analytic expression coefficient into the ammeter for crystal oscillator frequency compensation. The method is applied to crystal oscillator frequency adjustment of the intelligent electric meter, the adjustment effect is remarkable, the adjustment cost of the electric meter can be effectively reduced, and the qualification rate of the electric meter is greatly improved.

Description

technical field [0001] The invention relates to the technical field of metering equipment, in particular to a method for adjusting the crystal oscillator frequency of an intelligent electric meter based on exhaustion. Background technique [0002] The electric meter plays an indispensable role in today's intelligent society. As a metering device, not just a metering device, it is often accompanied by many functions, and these functions assist metering and play an indispensable role, such as Electric meter clock. On the surface, the clock of the ammeter is just a travel time tool, but it cannot be just a rough travel time. It needs accurate travel time, and the clock error should not exceed ±0.1s / d at room temperature. In addition, it is undeniable that the impact of ambient temperature on the ordinary quartz crystal oscillator itself, that is, temperature drift, the oscillation frequency of ordinary quartz crystal oscillators at different temperatures has a fatal impact on ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/04
CPCG01R35/04
Inventor 彭勇王蕾
Owner SHENZHEN FRIENDCOM TECH DEV