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发表于 2005-11-30 22:02:00
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频谱分析仪用的常用检波方式有:sample,positive peak ( simply called peak), negative peak, normal, average, Quasi-peak
其用途分别为:
• Negative peak detection displays the lowest sample taken during the interval
being displayed.
• Positive peak detection displays the highest sample taken during the interval
being displayed.
• Sample detection displays the sample taken during the interval being displayed,
and is used primarily to display noise or noise-like signals. In sample mode, the
instantaneous signal value at the present display point is placed into memory.
This detection should not be used to make the most accurate amplitude
measurement of non noise-like signals.
• Average detection is used when measuring the average value of the amplitude
across each trace interval (bucket). The averaging method used by the average
detector is set to either video or power as appropriate when the average type is
auto coupled.
而EMI需要专用的EMI average 检波和 quasi-peak 检波
这些检波方式在普通的频谱分析仪中不是标准配置,如agilent的ESA系列
要测量EMI,需要购买Option AYQ
也就是Quasi-peak detection 和EMI Average detection
或者直接购买agilent的E7400A 系列EMC分析仪或者PSA系列频谱分析仪
但是个人觉得,如果只是观察EMC或者EMI的信号,只需要买个EMC或者EMI的探头和前置低噪放,也可以定量的观察一下EMC或者EMI的
可以参考agilent 的 spetrum analysis basics :application note 150和 ESA Series Spectrum Analyzers useguide
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