嗯,通常如果您将端口1连接到端口2,并且您已完成校准,则端口1测量端口2匹配并校正负载匹配,因此我应该期望大约-50 dB(不通过Ecal)
只有大约10-15分贝的匹配)。
所以得到-25说已经有些东西了。
如果你的意思是改变端口1衰减器并且S11从-25上升到-10,那么它比我预期的要多。
源匹配更改,但不是方向性。
另一件事可能是你已经卡住了注意器,所以即使端口认为它也没有切换值衰减器。
通过UNCALIBRATED测量,以及从端口1到端口2的通过,将参与者设置为校准的标称值,设置S11和S21跟踪,以及R1,1和B,1跟踪。
标准化(与Data => mem和Data / Mem相同)S21,B和R1;
对于S11,将数据写入mem,数据MINUS mem。
在每条痕迹上放置一个标记。
归一化迹线应读取0 dB,S11应为-70或更高dB。
现在切换衰减器,拍摄所见的屏幕截图,然后将其发回。
标准化迹线应在= -0.5 dB范围内读取相同值,S11应读取低于-50 dB。
以上来自于谷歌翻译
以下为原文
Hmm, normally if you have port 1 connected to port 2, and you have done a calibration, then port 1 measures the port 2 match and corrects for the load match so I should expect about -50 dB for a thru (not through the Ecal which has only about a 10-15 dB match). so getting -25 says already something is off.
If you mean you changes port 1 attenuator and S11 goes up from -25 to -10, then it is more than I expect. The source match changes, but not the directivity. The other thing could be you have stuck attenutator so the value attenuator doesn't switch even though the port thinks it does.
With an UNCALIBRATED measurement, and a thru from port 1 to port 2, set the attenautor to the nominal value for the calibraiton, set up an S11 and S21 trace, as well as an R1,1 and B,1 trace. Normalize (same as Data=>mem and Data/Mem) S21, B and R1; For S11 do a data into mem, data MINUS mem. put a marker on every trace. The normalized traces should read 0 dB, and S11 should be someithing like -70 or more dB. Now switch the attenuator, take a screen shot of what you see, and post it back. The normalized traces should read the same within =-0.5 dB, the S11 should read below -50 dB.
嗯,通常如果您将端口1连接到端口2,并且您已完成校准,则端口1测量端口2匹配并校正负载匹配,因此我应该期望大约-50 dB(不通过Ecal)
只有大约10-15分贝的匹配)。
所以得到-25说已经有些东西了。
如果你的意思是改变端口1衰减器并且S11从-25上升到-10,那么它比我预期的要多。
源匹配更改,但不是方向性。
另一件事可能是你已经卡住了注意器,所以即使端口认为它也没有切换值衰减器。
通过UNCALIBRATED测量,以及从端口1到端口2的通过,将参与者设置为校准的标称值,设置S11和S21跟踪,以及R1,1和B,1跟踪。
标准化(与Data => mem和Data / Mem相同)S21,B和R1;
对于S11,将数据写入mem,数据MINUS mem。
在每条痕迹上放置一个标记。
归一化迹线应读取0 dB,S11应为-70或更高dB。
现在切换衰减器,拍摄所见的屏幕截图,然后将其发回。
标准化迹线应在= -0.5 dB范围内读取相同值,S11应读取低于-50 dB。
以上来自于谷歌翻译
以下为原文
Hmm, normally if you have port 1 connected to port 2, and you have done a calibration, then port 1 measures the port 2 match and corrects for the load match so I should expect about -50 dB for a thru (not through the Ecal which has only about a 10-15 dB match). so getting -25 says already something is off.
If you mean you changes port 1 attenuator and S11 goes up from -25 to -10, then it is more than I expect. The source match changes, but not the directivity. The other thing could be you have stuck attenutator so the value attenuator doesn't switch even though the port thinks it does.
With an UNCALIBRATED measurement, and a thru from port 1 to port 2, set the attenautor to the nominal value for the calibraiton, set up an S11 and S21 trace, as well as an R1,1 and B,1 trace. Normalize (same as Data=>mem and Data/Mem) S21, B and R1; For S11 do a data into mem, data MINUS mem. put a marker on every trace. The normalized traces should read 0 dB, and S11 should be someithing like -70 or more dB. Now switch the attenuator, take a screen shot of what you see, and post it back. The normalized traces should read the same within =-0.5 dB, the S11 should read below -50 dB.
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