如何检查滑动负载

检查滑动负载时，您将从基本知识开始，例如目视检查对配合平面或其他地方的任何损坏。
将引脚深度设置为适用值后，下一步将验证其回波损耗。
如果负载的回波损耗大于-46dB，这可能很困难，除非你的VNA具有更好的校正方向性。
如果是这样，您将需要测量每个位置滑动负载的回波损耗（实际上是史密斯圆图中的电阻和无功值）（对于HP / Agilent / Keysight滑动负载，通常为6）。
从那里你需要计算滑动负载的有效回波损耗。
NIST已经写了几篇关于如何做的文章。
在此期间，我附上了您可以使用的电子表格。
在RAW选项卡上输入六个电阻值和六个无功值。
接下来的5个标签会有一堆数学...你会对DATA选项卡上的最终答案感兴趣。
希望能帮助到你。



     以下为原文

  When checking a sliding load you will begin with the basics like a visual check for any damage to the mating plane or elsewhere.  After you set its pin depth to the applicable value, the next step would be to verify its return loss.  This can be difficult if the load's return loss is greater than -46dB unless you have a VNA with corrected directivity much better than that.  If so, you will need to measure the return loss (actually its resistive and reactive values from the Smith Chart) of the sliding load in each of its positions (usually 6 for HP/Agilent/Keysight sliding loads).  From there you'll need to calculate the effective return loss of the sliding load.  NIST has written several papers on how to do it.  In the meantime I attached a spreadsheet you can use.  Enter your six resistive and six reactive values on the RAW tab.  There is a bunch of math going on with the next 5 tabs...you'll be interested with the final answer on the DATA tab.  Hope it helps.

附件

• Sliding Load Calc 3.5 mm Scratch Sheet.xls247.0 KB