摘要
Abstract
The system on a chip (SOC) scheme which integrates multiple elements becomes a focus of Watt-hour meter manufacturers due to its cost advantage. This scheme adopts external crystal oscillator , so daily timing error is vulnerable to interference. Through analyzing influencing factors of daily timing error , it is ob-tained that daily timing error is mainly affected by ambient temperature, compensation temperature, aging degree of crystal oscillator and etc. This paper presents control demands from aspects of device selection , fab-ric swatch design, welding technology and so on. It is verified that daily timing error based on SOC scheme can achieve the same accuracy and reliability requirements as the independent clock chip scheme.关键词
SOC方案/电能表/日计时误差/可靠性控制Key words
SOC scheme/Watt-hour meter/daily timing error/reliability control分类
信息技术与安全科学
