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MPPC接前放

Other Parts Discussed in Thread: OPA656

使用滨松公司的MPPC(S13360),用碘化铯晶体,封装在一起后接滨松公司的MPPC电源产品(C12332-01)给MPPC供电,最后接入到自己用面包板连接的一个前放(其中运放用的是OPA656)。测得电路给MPPC供电正常,用放射源后并没有信号读出。一直没找到原因?

有没有大神指导一下?