Ecal如何测试

我想到了几个问题。
1）您使用与分析仪相同的校准套件是否已设置使用？
菜单中通常可以选择校准套件，如果您使用的校准套件不是VNA所假设的校准套件，那么您将遇到问题。
但那些应该是系统错误，而不是像你似乎得到的随机错误。
2）您是否使用扭矩扳手拧紧连接器？
你是否正确清理连接器？
如果没有，那么这将导致随机错误，这是您似乎得到的排序。
有关于连接器护理的安捷伦应用说明。
问题不可重复的事实告诉我，电缆，连接器存在问题，或者您没有练习正确的连接器护理。
戴夫



     以下为原文

  A couple of questions come to my mind. 


1) Is the calibration kit that you are using the same as the analyzer is set up to use? There are usually a choice of cal kits in the menus, and if you are using a calibration kit that is not the one the VNA is assuming, then you will get problems. But those should be systematic errors, not random ones like you appear to be getting. 

2) Are you using a torque wrench to tighten the connectors? Are you clearning connectors properly? If not, then this will cause random errors, which is the sort you appear to be getting. There's an Agilent application note about connector care. 

The fact the problems are not repeatable suggests to me that there is a problem with a cable, connector, or you are not practicing the proper connector care. 

Dave

我觉得你有太高的期望。
对于源匹配和方向性，您看到的误差大约为52 dB，对于S21传输跟踪，误差大约为0.01-0.2 dB。
这些规格对于反射误差为40-46 dB（取决于频率），对于传输为0.03-0.05 dB。
问题几乎可以肯定是你的电缆。
您可以通过在电缆上短路来测试电缆，无需校准即可测量S11。
将数据放入内存，然后将数据存储（数据MINUS内存）并弯曲电缆。
错误是所有电缆错误。
引用有关VNA测量的着名参考文献：“电缆对射频和微波工程师的存在是一种祸害。通过比喻，人们可以说电缆就像狗一样;要么它们很糟糕，要么很差，
或者他们会变坏，当他们很好的时候，他们只会非常小心地保持良好状态。“[1]所以，测试你的电缆。
[1] http://www.wiley.com/WileyCDA/WileyTitle/productCd-1119979552.html



     以下为原文

  I think you have too high of expectations.  The errors that you are seeing are on the order of 52 dB for source match and directivity, and on the order of 0.01-0.2 dB for S21 transimssion tracking.

The specifications for those are on the order of 40-46 dB (depending upon frequency) for the reflection errors, and 0.03-0.05 dB for transmission.

The problems is almost certainly your cables.  You can test the cable by putting a short on the cable, measuring S11 without calibration. Put data into memory and then data-mem (data MINUS memory) and flex the cable.  The error is all cable error.

To quote a famous reference on VNA measurments: 
"Cables are a bane to the existence of the RF and microwave engineer.  By way of a simile, one can say that cables are like dogs;  either they are bad, they’ve been bad, or they are going to be bad, and when they’re good, they only stay good with great care. " [1]

So, test your cables.

[1]http://www.wiley.com/WileyCDA/WileyTitle/productCd-1119979552.html

感谢所有的帮助，结果是端口2电缆出去了。
今天我将把电缆送出来检查，以便与安捷伦的调查结果相提并论。



     以下为原文

  thanks for all the help, turns out that port 2 cable is going out. I will be shipping the cables out today to get them inspected to confrom my findings with Agilent.