I2C bus digital potentiometer AD5242 was used as core of digital alternating current parameter multi-function meter, it has a point, two point and multiple point sampling arithmetic.
数字式工频交流电参数多用表以i2c总线数字式电位器ad5242为核心，其采样算法有一点、两点及多点。
GPS timing technique is used to realize remote multi -terminal synchronized sampling thereby enhancing the reliability of longitudinal difference protection of current.
通过引入GPS定时技术解决了远距离多端同步采样问题，从而使电流纵差保护具有更高的可靠性。
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