观察射频信号 用示波器探头与sma转bnc线观察出现截然不同的结果 一个示波器探头在40M时衰减了0.8 sma增大了两倍
示波器探头带宽100 示波器带宽300
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现在是不加50欧负载 正常 加上50欧负载就会在67M出现3db尖峰响应 是不是示波器的负载效应影响?