怎么使用50欧姆网络分析仪测量75欧姆DUT

> {quote：title = stanleysg写道：} {quote}>大家好，>>论坛上有几个关于使用50欧姆网络分析仪进行75欧姆DUT测量的讨论，但我的情况有些不同。
>> 1）我有75欧姆校准套件，75欧姆电缆和50欧姆到75欧姆的adaloss垫适配器和E5071C。
>>我可以先连接适配器，然后连接电缆，然后直接连接DUT并使用75欧姆校准套件直接进行SOLT校准吗？
>>我会将系统阻抗Zo改为75欧姆。
>>这将是不同的方法，完全绕过50欧姆校准。
> http://www.home.agilent.com/agilent/editorial.jspx?cc=US&lc=eng&ckey=1764164&nid=-536902639.350794&id=1764164 >>这会有效吗？
谢谢。
您提供的链接http://www.home.agilent.com/agilent/editorial.jspx?cc=US&lc=eng&ckey=1764164&nid=-536902639.350794&id=1764164，标题为+“是吗？
可以使用ENA测量50至75Ω的阻抗匹配设备吗？“+是关于使用+适配器移除+威廉希尔官方网站 实际测量50至75欧姆匹配设备的S参数的页面。
这是一个比你想做的更复杂的任务，它可以测量一个简单的75欧姆DUT的S参数。
当希望测量不可插入的50欧姆DUT的S参数时也使用适配器移除 - 通常是两端带有母连接器的D参数。
其他不可插入的设备在两个端口都是*男性 - 比两个端口的女性要少一些。
*每个端口有不同的连接器，例如N在一个端口，SMA在另一个端口。
（功率放大器并不罕见）*在一个端口同轴，在另一个端口使用波导。
（我实际上很快会尝试使用它来测量一些WR75到波导设备的丢失，用于10.368 GHz的无线电火腿）。
适配器移除是一个非常复杂的过程，需要大量的连接。
我不知道你的ENA是否支持未知通过，这是一个比适配器移除更少痛苦的过程，但无论如何你不需要它来简单测量75欧姆DUT。
请注意，如果您的DUT不可插入，例如两端的女性，则需要查看此类事情，但这是一个不同的问题。
要在75欧姆DUT的一个端口或可插入的75 DUT的两个端口进行测量，您不需要任何此类复杂情况。
Dave编辑：drkirkby于2014年5月19日上午7:53编辑：drkirkby于2014年5月19日上午8:07



     以下为原文

  > {quote:title=stanleysg wrote:}{quote}
> hi all,
> 
> there are several discussions in the forum about 75ohm DUT measurement using 50ohm network analyzer however my condition is slighlty different.
> 
> 1) i have 75ohm cal kit, 75ohm cable and 50ohm to 75ohm adaloss pad adapter and E5071C.
> 
> can i just connect the adapter first, then cable, then DUT and performing the SOLT calibration directly using 75ohm cal kit?
> 
> i would change the system impedance Zo to 75ohm. 
> 
> it would be different method from here and bypass the 50ohm calibration completely.
> http://www.home.agilent.com/agilent/editorial.jspx?cc=US&lc=eng&ckey=1764164&nid=-536902639.350794&id=1764164
> 
> will this work? thanks.


The link you gave 

http://www.home.agilent.com/agilent/editorial.jspx?cc=US&lc=eng&ckey=1764164&nid=-536902639.350794&id=1764164

with the title 

+"Is it possible to measure a 50 to 75 Ω impedance matching device using the ENA?"+ 

is a page about using the +adapter removal+ technique to actually measure the S-parameters of the 50 to 75 Ohm matching device. That  is a *much* more complicated task than what you want to do which is measure the S-parameters of a simple 75 Ohm DUT. 

Adapter removal is also used when wishing to measure the S-parameters of a non-insertable 50 Ohm DUT - typically one with female connectors on both ends. Other non-insertable devices would be 

* Males at both ports - somewhat rarer than females at both ports. 
* Different connectors at each port, such as N on one and SMA on the other. (Not unusual for power amplifiers)
* Coax at one port, and waveguide at another. (I'm actually going to try using this soon to measure the loss of some WR75 to waveguide devices for a radio ham at 10.368 GHz). 

Adapter removal is painfully complex process, requiring a lot of connections. 

I don't know if your ENA supports unknown thru, which is a less painful procedure than adapter removal, but in any case you don't need need it for your simple measurement of a 75 Ohm DUT. 

Note you would need to look at this sort of thing if your DUT is non-insertable, such as female at both ports, but that is a different issue. To measure at one port of a 75 Ohm DUT, or at both ports of a insertable 75 DUT, you don't need any such complications. 

Dave

Edited by: drkirkby on May 19, 2014 7:53 AM

Edited by: drkirkby on May 19, 2014 8:07 AM

嗨drkirkby，谢谢!!
我也从这里得到答案：http：//www.home.agilent.com/agilent/editorial.jspx？cc = US＆amp; cs = eng＆amp; ckey = 1000002208：epsg：faq＆amp; nid = -536902444.0.00＆amp; id
= 1000002208：epsg：faq毕竟我们必须使用75欧姆校准套件。



     以下为原文

  Hi drkirkby,

thanks!!  

i got the answer from here too:
http://www.home.agilent.com/agilent/editorial.jspx?cc=US&lc=eng&ckey=1000002208:epsg:faq&nid=-536902444.0.00&id=1000002208:epsg:faq

after all, we must use a 75ohm cal kit.