专家好!
问题:调试时发现INI121-3脚有输入10-20mv的信号,但在6脚却无输出(原理图见附件)。请指正,多谢了!
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可否用示波器或者万用表量一下6脚的电压?可能是输入端的直流没建立起来,在C2和Rh1之间连接一个1K的电阻到地,看看效果怎样。另外,如果单测INA121,可以把C3拆掉,让芯片空载,同时将Rh1和Ch1拆掉,直接在3口注入一个+/-10mV的正弦波,然后看6脚的输出。