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。
Discovery after study, the electric parameter change reason is the dirt adhered at the producing on the surface of potentiometer inner basic chip absorbs wet in high thermal wet ambient.
经研究发现，电参数变化的原因是电位器内部基片表面在生产时附着的脏污在高热潮湿环境下吸潮造成。
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