是否有任何免费软件可以帮助用户更好地理解平衡的VNA测量

以下应用说明可以很好地解释平衡/差分测量的基础知识。
http://www.home.agilent.com/upload/cmc_upload/All/Characterization_of_BDC.pdf对于软件，4端口的PNA或ENA网络分析仪都具有专门用于进行平衡设备测量的内置功能。
此外，我们还有一个更全面的软件包，针对信号完整性应用程序，可与PNA和ENA一起使用。



     以下为原文

  The following application note does a good job of explaining the basics of balanced/differential measurements.  

http://www.home.agilent.com/upload/cmc_upload/All/Characterization_of_BDC.pdf

As for software, both the 4-port varieties of PNA or ENA network analyzers have built-in features specifically designed for making balanced device measurements.  In addition, we have a more comprehensive software package aimed at Signal Integrity applications that work with both PNA's and ENA's.

亲爱的达拉斯;
非常感谢你的精彩帖子。
应用笔记非常易于阅读和理解，而且信息量很大。
再次，非常感谢你。



     以下为原文

  Dear Daras;

      Thank you so much for your really great post.    The application note was very easy to read and understand and also very informative. Again, thank you very much.

> {quote：title = SOLT_guy写道：} {quote}>尊敬的先生：>>我是VNA平衡测量新手。
我必须承认这不是我做过的事情。
>过去，安捷伦过去常常分发包含问题的应用笔记，提供数字输入和解决方案的问题，任何人都可以向我指出详细的应用说明，以帮助我更好地理解平衡的VNA测量。
你有一本乔尔的书吗？
http://www.amazon.com/Handbook-Microwave-Component-Measurements-Techniques/dp/1119979552关于平衡测量，有一整章（44页）。
我看了你的帖子后，10分钟前我第一次看了。
很明显，理想情况下需要一个4端口VNA。
戴夫



     以下为原文

  > {quote:title=SOLT_guy wrote:}{quote}
> Dear Sir:
> 
>       I am new to VNA balanced measurements.

I must admit it is not something I have ever done.  

>       In the past, Agilent used to distribute application notes that contained worked out problems, problems that offered numerical inputs and solutions, can anyone point me to a detailed application note to help me understand balanced VNA measurements better.  

Do you have a copy of Joel's book? 

http://www.amazon.com/Handbook-Microwave-Component-Measurements-Techniques/dp/1119979552

There is a whole chapter in there (44 pages) on balanced measurments. I looked at if for the first time 10 minutes ago, after I see your post. It is clear one ideally needs a 4-port VNA. 

Dave

亲爱的柯比博士;
感谢您的反馈意见。
我第一次出来时购买了Dunsmore博士的书，AMAZON告诉我，我的订单将在指定的周数（不到一个月）内发货。
大约两个月后，我收到了亚马逊的一封信，问我将会有运输延迟，并提出一个问题，“你还想买这本书。”
我翻了个身。
大约3个月和几个星期后，这本书终于到了我的家门口，我是******。
我没有足够的时间来仔细查看整本书，但我确实阅读了关于平衡VNA测量的章节。
关于平衡VNA测量的部分是为新手编写的，他必须通过新兴技术的所有进化混淆来导航。
本书的这一部分写得很好，因为只有在该行业工作多年的人才能够以经济有效的方式解决所有最初的进化混乱。
[删除评论]进行投资时，您会遇到与市场相关的业务问题。
您购买的书籍也是满足您市场需求的投资。
就像我一样，你支付了教育费用。
你发现你的机构没有足够的教学，所以你不得不购买另一本教科书来跟上不断变化的市场。
你是这样做的，就像我一样。
你似乎不再在学术界学习或工作，因为你必须像我一样在这个论坛上提出很多问题（请告诉我这是否正确）。
请告诉我你对这种情况的看法？
编辑：SOLT_guy于2013年1月5日12:07 PM编辑：SOLT_guy于2013年1月6日上午8:50



     以下为原文

  Dear Dr. Kirby;

      Thank you for your feedback.

      I purchased Dr. Dunsmore's book when it first came out and AMAZON told me my order would ship within a specified number of weeks (less than a month).    About two months later, I get a letter from AMAZON asking me that there will be a shipping delay and poses the question, "do you still want to buy the book."   I flipped out.   About 3 months and some weeks later, the book finally arrives at my doorstep and I am ******.   I have not had enough time to really look over the entire book but I did read the chapter on balanced VNA measurements.

      The section on balanced VNA measurements was written for the novice who has to navigate his way through all the evolutionary confusion of an emerging technology.   That part of the book was well written because only people working in the industry for years would have been able to navigate through all that initial evolutionary confusion in a cost-effective manner.   

      [Deleted Comment]

      You have market related business concerns when you make an investment.   The books you buy are also an investment to fulfill your market needs.    You paid for an education, just like I did.   You discovered your were not taught enough at your institution and so you had to buy another textbook to keep up with a changing market.    You did this on your own initiative, just like I did.  

      It appears that you are no longer studying or working in academia because you have to raise a lot of questions in this forum just like me (please tell me if this is correct).   Please tell me about your feelings with regard to this condition?

Edited by: SOLT_guy on Jan 5, 2013 12:07 PM

Edited by: SOLT_guy on Jan 6, 2013 8:50 AM

> {quote:title=SOLT_guy wrote:}{quote}
> Dear Dr. Kirby;
> 
>       Thank you for your feedback.
> 
>       I purchased Dr. Dunsmore's book when it first came out and AMAZON told me my order would ship within a specified number of weeks (less than a month).    About two months later

I don't know what was up with Amazon US with that book. I'd bought my copy from Amazon UK. I ordered it on 30 Aug 2012, and it was dispatched on Thursday 20 Sep 2012. I guess I got it a day or two later. 

I don't know when the book was available on Amazon USA, but it was certianly several weeks after I'd got my copy. 

>       The section on balanced VNA measurements was written for the novice who has to navigate his way through all the evolutionary confusion of an emerging technology.   That part of the book was well written because only people working in the industry for years would have been able to navigate through all that initial evolutionary confusion in a cost-effective manner.   

Balanced measurement is not something I have wanted to do, though they might be in the not too distanct future. However, a quick glance of the chaper did not leave me the impression it gave you. Sure it was a lot heavier reading than the application note you were given, but there is a lot more detailed information too. I guess reading that application before Joel's book would be sensible. 

My main concern of that chapter was the size of some of the diagrams. To put 16 plots on half of page 513 just seems crazy.  I know my vision is not 20/20, but I had to take a magnifying glass to read what the plots were supposed to be. I think they could do with some big letters on them saying S11, S21 etc. That aspect does seem to be a common fault in the book, though I've not seen any page quite as bad as page 513, with 16 S-parameter plots in half a page. 

> This book is not written in  lab manual form. 

I'm not quite sure what you mean by that. It is fairly heavy theoretically, but I feel it complements the application notes, which are easier to read, but don't provide the level of details of Joel's book. 

If must admit, I'm still puzzled by how to sepparate the delay from fringing capacitance in section 9.1, which is again not helped by the fact one needs a microscope to see some of the text on the plots. 

>       You have market related business concerns when you make an investment.   The books you buy are also an investment to fulfill your market needs.    You paid for an education, just like I did.   You discovered your were not taught enough at your institution and so you had to buy another textbook to keep up with a changing market.    You did this on your own initiative, just like I did.  

I don't think I was introduced to a VNA in any of my formal education, which includes an M.Sc in Microwaves and Optoelectroincs from University College London. My Ph.D was in Medical Physics, so a bit unrelated, though people are using VNAs in medical applications, attempt to detect things like tumor tissue, though personally I think they are wasting their time. 

>       It appears that you are no longer studying or working in academia because you have to raise a lot of questions in this forum just like me (please tell me if this is correct).   

I do no longer work in academia. In fact, I am currently unemployed! (Anyone in the UK got a job for an Optics/RF person?) 

> Please tell me about your feelings with regard to this condition?

Well, as I say, I was not really taught about VNAs during my education, though I did use a HP vector voltmeter during my B.Sc project, which was an antenna project. I first got to use one when designing antennas for a contract job, then worked with one in an antenna company I worked for. But there it was used as a glorified SWR meter, and it did not matter too much if the antennas failed the SWR test, as the MD would want them shipped. The quality controll was appaling. 

it was a funny place to work. The sales manger, who had been selling antennas for 20 years, did not know the difference between gain and return loss. He could not calculate the length of a half-wave dipole. But he would tell me how to design antennas. I recall on one occasion him wanting to put sellotape in some BNC connectors, when there was an issue with the inner shorting to the outer. Anyway, he became the MD, and 1-2 weeks later he deceided there was no need for me in the company. Not a bit surprise really. I knew he was an idiot, and would not take any of his ****. 

But it got me more interested in VNAs, and I'm hoping to apply them to antenna design again, setting up my own business, though there are some practical obsticles just now. 

The VNAs I use are all my own personal property. I bought Joel's book to improve my knowlege of VNAs, and I don't regret that decision at all. 

Sure I ask a lot of question on here (perhaps too many!), but I don't think that is anything to do with me working in academic, in industry, or as the case is currently, I'm out of work. I want to improve my knowledge, and here seems a good place given I own HP VNAs. 

Dave

亲爱的柯比博士;
你曾经问过我这个具体的问题：“你有一份Joel的书吗？http：//www.amazon.com/Handbook-Microwave-Component-Measurements-Techniques/dp/1119979552有一整章
在那里（44页）关于平衡测量。我看了10分钟前第一次看到你的帖子后。很明显一个理想情况下需要一个4端口的VNA。“我回答我确实购买了Dunsmore博士的
书。
我相信你误解了我所写的内容。
我从未说过，也没有暗示，我“后悔”购买了这本书。
事实上，由于Dunsmore博士在购买他的书的任何人都可以在这个论坛上提供反馈，我会向任何想要学习使用测试仪器的人推荐他的书。
这是Dunsmore博士提供的“独特”且有价值的服务，因此，购买他的书比其他所有竞争对手（即除非他们提供与他提供的服务相同）肯定会受益。
事实上，为了确保人们外出购买他的教科书，我删除了之前的评论。
我要补充一点，鉴于Dunsmore博士提供的服务，就像现在的市场一样，据我所知，人们永远不会比购买Dunsmore博士的书更好。
我实际上买了Dunsmore博士的书，以感谢他（以我的方式“感谢他”）回答我的问题，也因为我需要购买一本参考手册来进行各种微波测量。
我之前发表评论的唯一原因是因为我想看看你是否也看到了满足行业需求的困难，并且考虑到“市场”所拥有的所有资源，普通人可以获得给定的信息。
提供，并且条件是一个人在学术界直接“不工作”，或者由业内人员进行专门培训（辅导）。
我观察到很多年前，由于HP应用笔记的编写方式，人们可以根据市场上所有可用的资源进入市场。
顺便说一句，HP /安捷伦是测试和测量领域中为数不多的，也是唯一一家发布有关其产品的详细信息，甚至向其客户提供教育CD的公司之一。
我注意到，如果没有公布详细信息，那么只有那些有资格在特定领域工作的人才是经过专门培训才能完成工业任务的人，或者已被接受在学术界工作的人
可以向高级员工提出问题。
这是一个你应该思考的想法。
顺便说一句，当你写道：“我不认为我在任何正规教育中都被介绍过VNA，其中包括伦敦大学学院的微波和光电学硕士学位。我的博士学位是医学物理学
“在美国，对于EE MS课程，通常会有一个专注于VNA测量和其他测试仪器的课程。
您可能已经在我之前的帖子中注意到我提出了一些学术问题。
随着岁月的流逝，你会看到我提出的学术问题，你也需要回答。
没有办法解决这个问题。
你必须走同样的道路 - 如果你遵循现有的传统思想流派（或者甚至能够批判传统的“思想流派” - 你必须走同样的道路）。
你必须遵循我所在的路径。
这是你思考的另一个想法。
思考这些想法。



     以下为原文

  Dear Dr. Kirby;


You had asked me this specific question out of the blue:


"Do you have a copy of Joel's book? 

http://www.amazon.com/Handbook-Microwave-Component-Measurements-Techniques/dp/1119979552

There is a whole chapter in there (44 pages) on balanced measurments. I looked at if for the first time 10 minutes ago, after I see your post. It is clear one ideally needs a 4-port VNA. "


I answered that I did purchase Dr. Dunsmore's book.   

I believe that you have misinterpreted what I  had written.  I had never said, nor implied, that I "regretted" the purchase of the book.  

In fact, since Dr. Dunsmore offers feedback at this forum available to anyone who purchases his book, I would reccommend his book to anyone who wants to learn about using test instruments.     This is a "unique" and valuable service that Dr. Dunsmore offers and, therefore, one would certainly benefit from purchasing his book over all other competitors (that is, unless they offered the same service that he offers).   

In fact, to be certain that people go out and purchase his textbook, I deleted my prior comment.   I will add, that given the service that Dr. Dunsmore offers, as the market stands now, to my knowledge, one will never get a better bargain than to buy Dr. Dunsmore's book.   

I actually bought Dr. Dunsmore's book to thank him (in my way of "thanking him") for replying to my questions and also because I needed to purchase a reference manual for making various microwave measurements.   

The only reason I had made my prior comment is because I wanted to see if you also see the difficulty in meeting the demands of the industry with the given information which is available to the average individual, given all the resources the "market" has to offer, and under the condition that one is "not working" directly in academia, or being specifically trained (tutored) by someone in the industry.

I have observed that many years ago, one could enter into the market given all the available resources of the market, because of how the HP application notes were written.    By the way, HP/Agilent is one of the few, or, the only company in the test and measurement field, which has published this type of detailed information about its products and even offered educational CDs to its customers.    

I have noticed that if detailed information is not published, then only the only people who are qualified to work in specific fields are individuals who have been specifically trained to do the task at hand in industry, or have been accepted to work in academia where they can pose questions to senior employees.     This is a thought you should ponder.

By the way, when you wrote:

"I don't think I was introduced to a VNA in any of my formal education, which includes an M.Sc in Microwaves and Optoelectroincs from University College London. My Ph.D was in Medical Physics"

In the US, for an EE MS curriculum, typically there will be a class focussing upon VNA measurements and other test instruments.


You may have noticed in my prior posts that I have raised some academic questions.   As the years go by, you will see that the academic questions that I have raised, you require to have answered also.   There is no way around this.   You have to take the same path I do - if you follow current conventional schools of thought (or even to be able to critique conventional "schools of  thought" - you must take the same path).  You have to follow the same path that I am on.  This is another thought for you to ponder.  

Ponder these thoughts.