波导校准误差

> {quote：title = myonezaki写道：} {quote}>完成单端口波导校准后，在特定频率下存在0.2dB的陷波。
校准标准是“本土生长”的，具有由铜制成的偏移短路，其具有通过edm制造的腔和被认为是“次级标准”的负载。
已尝试使用其他负载，负载和偏移短路已与钻头空白，使用的gore和minibend电缆，pasternack和waveline发射器（wg到同轴适配器），pna上的port1和port3对齐。
都有相同的签名。
>> 1.在合成器中是否有像旧版8360一样的开关点？
> 2.关闭校准将删除此缺口> 3.内部负载> 4.将查看接收器以及内部衰减器，还有其他任何建议吗？
如果添加VNA的型号和固件，以及缺口的频率，可能会有所帮助。
你如何观察缺口？
你使用什么负载？
我不确定你如何定义“二级标准”。
您是否真的将它们与主要标准进行比较，如在NIST，NPL等国家校准实验室中进行的那样？
我对您的校准套件的更多技术细节感兴趣。
戴夫。



     以下为原文

  > {quote:title=myonezaki wrote:}{quote}
> after completion of a single port waveguide calibration, a 0.2dB notch exists at a specific frequency.  the calibration standards are 'home grown' with a an offset short fabricated out of copper with a cavity that has been manufactored via edm and a load that has been deemed 'secondary standard'.  have tried using other loads, loads and offset shorts have been aligned with drill blanks, used gore and minibend cables, pasternack and waveline launchers (wg to coax adapters), port1 and port3 on the pna.  all have the same signature. 
> 
> 1. is there a switch point in the synthesizer like the older 8360s?
> 2. turning off the calibration removes this notchk
> 3. internal load 
> 4. will be looking at the receivers as well as the internal attenuators, any other suggestions?

It might help if you add the model and firmware of the VNA, along with the frequency where the notch is. How do you observe the notch? 

What loads are you using? I'm not sure how you define "secondary standard". Are you really comparing them to a primary standard, as held in a national calibration laboratory like NIST, NPL etc? 

I'd be interested in more technical details about your calibration kit. 

Dave.

戴夫 - 我使用pnax n5242a，8-12 Ghz带宽，1601点，点平均，IFBW 1kHz，功率-5 dBm，port1和port2。
固件9.33.13，FPGA 54倾角或陷波发生在10.13GHz，S11（dB），而短路连接到wg端口后，校准（手动）完成。
校准中使用的wg负载是wr90负载，prd electronics inc，类型116a，sn1996，我没有负载的任何性能数据，但附加了它，我没有在10.13GHz的s11中观察到陷波。
谢谢



     以下为原文

  dave - im using a pnax n5242a, 8-12 Ghz bandwidth, 1601 points, point averaging, IFBW 1kHz, power -5 dBm, port1 and port2.
firmware 9.33.13, FPGA 54
dip or notch occurs at 10.13GHz, S11 (dB) while a short is connected to the wg port after the calibration (manual) has been completed.
the wg load used in the calibration is a wr90 load, prd electronics inc, type 116a, sn1996, i do not have any performance data of the load but with it attached i do not observe a notch in s11 at 10.13GHz.
thanks

看起来最近的频段切换点为10.664 GHz。
您可以通过关闭因子接收器校正来查看原始性能;
有一个特殊的诊断命令执行此操作*：DIAG：RXCAL：STAT OFF（预设或DIAG：RXCAL：STAT ON）关闭rxcal后，你可以看到所有Rx校准波段（我认为其中大约有33个，
如果我记得，它们列在帮助文件中）。
*注意：所有诊断命令都不能得到保证，如果我们在下一代代码中感觉它可能会消失。编辑：Dr_joel于2013年5月24日上午10:52



     以下为原文

  Looks like the nearest band switch point is at 10.664 GHz.

You can see the raw performance by turning off the factor receiver correction; there's a special diagnostic command which does this*:

DIAG:RXCAL:STAT OFF 

(preset or DIAG:RXCAL:STAT ON )

after turning off the rxcal, you can see all the Rx calibration bands (I think there are about 33 of them, and if I remember, they are listed in the help file).

*NOTE: all diagnostic commands are not guaranteed and might disappear if we feel like it in the next rev of code.

Edited by: Dr_joel on May 24, 2013 10:52 AM

dave - 因为我使用的偏移短路不同于标准偏移，如果偏移量为0.381英寸，我应该在cal kit文件中输入什么延迟特性？
（我正在使用42.48457psec），它将缺口转移到8.8GHz。



     以下为原文

  dave - since i am using an offset short that is different than the standard offset, if the offset is 0.381inches, what should i enter into the delay characteristics in the cal kit file ? ( i am using  42.48457psec) which shifted the notch to 8.8GHz.

延迟值应该只是偏移长度除以空中传播速度。
（2.997E10 cm / s）。
对于WR-90，四分之一波长应为9.7mm，延迟为32.366pS。
截止频率也很关键。



     以下为原文

  The delay value should be just the offset length divided by the speed of propagation in air. (2.997E10 cm/s).
For WR-90, the quarter wave length should be 9.7mm with a delay of 32.366pS.  The cut off frequency is also critical.