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MSP430FR6047: ADC捕获到的超声波回波信号存在问题

Part Number: MSP430FR6047
Other Parts Discussed in Thread: EVM430-FR6047

如图所示,用MSP430FR6047测水流量时,超声波回波为什么会往负半轴偏移,正常波形的零点应该是与横轴重合的吧?我使用的是自己的板子,有什么方法可以将回波信号改善吗?