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刘玉珍

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[问答]

PNA反射相位容差

我们使用N5230C测量电缆组件上的反射相位,电缆组件的一端有TNC连接器,另一端没有连接。
关于我们应该向客户指定的容差,我们提出了一个问题。
它们要求最终电缆组件+/- 1度,但由于我们为它们提供“往返”阶段,现在测得的公差是+/- 2度还是+/- 1度?
这里有很多讨论,提出了争论的两个方面。
谢谢。

以上来自于谷歌翻译


     以下为原文

  We are using an N5230C to measure reflected phase on cable assemblies that have a TNC connector on one end and are unconnectorized on the other.  A question has come up as to the tolerance we should be specifying to our customer.  They are requesting +/- 1 degree for the final cable assembly, but since we are supplying them with the 'round trip' phase, is the measured tolerance now +/- 2 degrees or does it remain +/- 1 degree?  There is quite a bit of discussion here presenting both sides of the argument.  Thanks.  

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孔德羲

2018-9-27 15:59:54
如果您指定传输阶段,则会有S21 = sqrt(S11),因此我建议将相位响应除以2.这相当于将限制设置为+ -2。
但是输入反射错误会导致更大的涟漪。
这是自动夹具移除的完美应用,它可以给出电缆的S参数,仅打开测量,并消除不匹配的影响。

以上来自于谷歌翻译


     以下为原文

  If you are specifying the transmission phase, you would have S21=sqrt(S11), so I would suggest dividing the phase response by 2.  That would be equivalent to setting the limit at +-2.  But input reflection errors can cause much bigger ripples. This is a perfect application for Automatic Fixture Removal, which would give the S-parameters of the cable, with an open only measurement, and remove the effects of mismatch.
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