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MSP430FE4272 不接电压时,测不到电流

Other Parts Discussed in Thread: MSP430FE4272

   最近在用MSP430FE4272 做电压电流表,看规格书时,说的是接电压时,是按功率除以电压算得,在不接电压时,电流是通过采样积分算得,可实际使用时发现不接   电压时,测不到电流。必须接上电压才能测到电流。这是为什么呢?

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