標題: 網路分析儀 - 高頻儀器之王
bx3aaq
論壇會員
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積分 1250
帖子 53
QRO 81
QSL 83
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QSP 90
註冊 2011-7-1
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狀態 離線
發表於 2013-1-27 18:55 
61.62.30.193
Dear BM2CAJ,
The HP8753E measurement for attenuator are shown(import and display with VNWA software)
1. Attenuator in 0/-20/-40/-60/-80/-110 dB



2. Attenuator in 0/-20/-40/-60/-80/-110 dB with data smooth average(same dataset as above)


It reflects some some information here
1. In the lower attenuation test, the measurement difference is below about 1dB
2. In the higher attenuation test(attenuator set to 110db), the measurement difference is quite large and the signal is fluctuated
3. With smooth average the measured data, the measurement difference is narrow down, but it also lost the detail of the result.
I am quite impressed the KC901H to get the -120dB attenuator measurement. The isolation for cable, connector and PCB board will not reach that level easily. Maybe it can also do good as a SDR frontend!!
73,
de bx3aaq

[ 本帖最後由 bx3aaq 於 2013-1-27 19:02 編輯 ]


BX2ADJ
主題版主
Rank: 8Rank: 8

積分 9804
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QRO 651
QSL 737
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QSP 830
註冊 2011-3-24
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發表於 2013-1-28 22:56 
114.24.140.95


QUOTE:
原帖由 bx3aaq 於 2013-1-27 06:55 PM 發表
Dear BM2CAJ,
The HP8753E measurement for attenuator are shown(import and display with VNWA software)
1. Attenuator in 0/-20/-40/-60/-80/-110 dB
2. Attenuat ...

Dear BX3AAQ,

感謝您的分享, 能見到專業儀器的測試, 真是高興! 漂亮極了!
比較之後, 看來 KC901H 的 S21 滿不錯的!

但我發現用 50 歐姆假負載測 S11
KC901H 與 VNWA 3E 的曲線都沒有很完美, 或 許 電橋不容易做完美?
一直猶豫要不要 po 出來...

如果你的時間 許 可, 再請你也測一下, 謝謝!

73,
de BM2CAJ

[ 本帖最後由 BM2CAJ 於 2013-1-29 01:21 編輯 ]