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这个论坛一直是我的信息来源之一。 我的问题/验证是：VNA不确定度计算器是否解释了VNA和UUT之间的不匹配？ 如果我将UUT的VSWR规格输入到计算器的S11输入中，我的印象就是在误差计算中用于不匹配。 我在公式的页面中看到计算器，它将ESF和ELF列为错误的两个术语（源和负载匹配）。 因此，在编制不确定性预算时，我不需要在总数中添加额外的不匹配项？ 另外，就断开电缆与E-Cal的连接并应用于UUT而言，在稳定性部分的连接器可重复性项中会考虑该误差吗？ http://na.support.keysight.com/p ... curve_equations.htm 以上来自于谷歌翻译 以下为原文 Hi guys, First off....thank you for all of the help. This forum has been one of my go to sources for information. My question/verification is: does the VNA uncertainty calculator account for mismatch between the VNA and the UUT? If I input our UUT's spec for VSWR into the S11 input in the calculator, I was under the impression it was used in the error calculation for mismatch. I see in the formula's page for the calculator that it lists ESF and ELF as two of the terms for error (source and load match). So composing an uncertainty budget, I wouldn't need to add an additional mismatch term to the total? Also in terms of disconnecting the cable from the E-Cal and applying to the UUT, that error would be accounted for in the connector repeatability term under the Stability section? http://na.support.keysight.com/p ... curve_equations.htm 
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7个回答
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传输和反射是独立计算的。
转到图表参数并输入S11 / S22（它只需要一个数字，我们假设它们是相同的）以获得它们对传输的影响。 对于反射，选择反射选项卡并输入S21 / S12（再次假设它是相同的）。 输入LINEAR中的值而不是dB（线性= 10 ^（dB / 20）。 以上来自于谷歌翻译 以下为原文 Transmission and reflection are computed independently. Go to the chart parameters and input the S11/S22 (it only takes a single number, we assume they are the same) to get their effect on the transmission. For reflection, choose the reflection tab and enter in S21/S12 (again, assumes it is the same). Enter the values in LINEAR not dB (Linear = 10^(dB/20). |
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脑洞大赛9 发表于 2018-10-18 19:53 好吧那么愚蠢的问题 - 如果我正在使用放大器，设置S21 / S12等于1（最大值）是否可以接受我的反射不确定性？ 我只对S11的不确定感兴趣。 以上来自于谷歌翻译 以下为原文 Okay so dumb question then-if I'm working with amplifiers, would setting S21/S12 equal to 1 (max) be acceptable for my reflection uncertainty? I'm only interested in S11 uncertainty. |
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60user54 发表于 2018-10-18 20:09 没关系，说如果不相等则使用sqrt（S21 * S12）。 以上来自于谷歌翻译 以下为原文 Never mind, says to use sqrt(S21*S12) if not equal. |
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脑洞大赛9 发表于 2018-10-18 19:53 还有一个我很好奇的领域：如果我们使用Sig Gen来提供VNA监视来自sig gen源的耦合信号的源，是否可以使用Rx调平来调整sig gen的源来 是否存在不匹配错误？ 或者源是否必须来自VNA才能执行Rx调平？ 以上来自于谷歌翻译 以下为原文 One more area I'm curious about: If we're using a Sig Gen to provide a source with the VNA monitoring a coupled signal coming off the sig gen source, would it be possible to use Rx leveling to adjust the sig gen's source to account for mismatch errors? Or would the source have to be coming from the VNA in order to perform Rx leveling? |
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60user54 发表于 2018-10-18 20:35 如果外部源由PNA控制，您可以在外部源上使用接收器调平，您可以使用PNA上的参考或测量接收器测量外部源。 但是，您应该知道，如果为外部源启用RxLeveling，则扫描将变得相当慢，因为PNA将在调平背景扫描中向外部源发送更多SCPI命令。 以上来自于谷歌翻译 以下为原文 You can use receiver leveling on an external source, if the external source is being controlled by the PNA and you can measure the external source either with a reference or measurement receiver on the PNA. However, you should know that if you turn on RxLeveling for an external source, your sweeps will become considerably slower, since the PNA will be sending many more SCPI commands to the external source in the leveling background sweeps. |
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Topcbpcba 发表于 2018-10-18 20:42 感谢Daras的反馈。 如果我们使用PNA接收器来校正不匹配，那么反馈到PNA的信号是否必须是反射波？ 我相信我们反馈到PNA的信号是在入射波方向上耦合的。 事件波反馈信号是否会为您提供执行Rx调平所需的信息？ 希望我措辞正确。 以上来自于谷歌翻译 以下为原文 Thanks for the feedback Daras. If we were to use a PNA receiver to correct for mismatch, would the signal that gets fed back to the PNA have to be the reflected wave? I believe the signal we have feeding back to the PNA is coupled in the incident wave direction. Would an incident wave feedback signal give you the information you need to perform Rx leveling? Hopefully I worded that correctly. |
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60user54 发表于 2018-10-18 20:52 您可以进行Rx调平而不会出现不匹配的修正。 在使用外部源进行Rx调平的情况下，我们仅对参考接收器应用响应校正。 只有Diff。 IQ应用程序，您可以在由外部源驱动的端口上进行匹配更正。 以上来自于谷歌翻译 以下为原文 you can do Rx Leveling without mismatch corrections. in the case of Rx Leveling with external sources, we only apply response corrections to the reference receiver. Only with the Diff. IQ app, you can have match correction on a port that is being driven by an external source. |
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