PNA选项87 IMD对于外部组合器是否有一些特定要求？

您好，我正在查看描述PNA系列各种选项的5990-7745EN.pdf文档。
在页14，在选项87的说明中：不适用于PNA选项200,210,400和410.当配置2端口PNA或2端口PNA-X与选项200或219时，外部信号发生器
和组合器是必需的。
但是，它没有提到选项217.我认为选项217和219之间的主要区别在于219有额外的偏差T恤。
只是想确认选项217还需要外部信号发生器和选件87的组合器才能工作。
此外，对于外部组合器，该部分是否有一些特定要求？
是德科技根据您自己的内部测试有任何建议吗？
我的公司正在寻找PNA 43.5GHz型号。
谢谢，rok



     以下为原文

  Hello,

I'm looking through the 5990-7745EN.pdf document describing the various options for the PNA family. On page 14, in the description of Option 87:

Not available with PNA Options 200, 210, 400 and 410. When configured with a 2-port
PNA or 2-port PNA-X with either Option 200 or 219, an external
signal generator and a combiner are required.  

However, it doesn't mention Option 217. I thought the main difference between options 217 and 219 was that 219 had the additional bias tees. Just wanted to confirm that option 217 also requires an external signal generator and a combiner for Option 87 to work.

Also, for the external combiner, is there some specific requirements for that part? Does Keysight have any recommendations based on your own internal testing? My company is looking at PNA 43.5GHz models.  

Thanks,
rok