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TI 电能计量之疑问

Other Parts Discussed in Thread: MSP430FE427A

问题1,根据TI官网连接www.ti.com/.../slaa203c.pdf 打开后发现  在单相电表设计时,检流方案为什么在高电位侧检流?

近1的负载进行测量,功率因数<0.6的负载无法测量,或是误差非常大了。电流几乎小了50%。这是为什么?

(难道TI个msp430fe427a不能对真有效值进行测量?)