There are three kinds of cables we often use to measure the electric signals: coaxial cables with BNC connectors, twisted-pair cables with banana plus connectors, and coaxial cables with SMA connectors. When I measure a signal with different kinds of cables or different lengths of cables, I will get different results in my measurement. Why? Explain the phenomenon by the following cables properties between the cables mention above:
(a) Bandwidth
(b) S/N ratio
(c) Power loss
(d) Impedance
2005-12-04 17:36:48 · 4 個解答 · 發問者 Anonymous in 科學 ➔ 工程學
BNC接頭是1940以發明人Bayonet Neill Concelman 命名,使用頻寬DC~4GHz,Impedance有50及75歐姆,Insertion Loss約0.2dB使用範圍相當廣,早期電腦連結至現在工業儀器及常見的監視系統都會用到
SMA接頭1960年代,是SubMiniature version A的縮寫,使用頻寬DC~18GHz,Impedance目前有50歐姆,Insertion Loss約0.09dB使用範圍相當廣,工業儀器,車用,航空及無線網路外接天線都會用到
以上二種屬同軸接頭,所以會搭配同軸電纜coaxial cables
banana接頭屬於一般電器測試接頭,多用於一般家用音源及電器,及電器測試頭,頻寬低於100MHz,50歐姆,搭配雙絞線Twisted Pair Cable
2005-12-04 20:06:17 · answer #1 · answered by K 1 · 0⤊ 0⤋
頻寬的範圍我補充一下雖然SMA是到達18GHz,但以目前的市場指開發到6GHz特性就算很好了,其他一些國家只使用到2.4 2.5GHz!
(本身是conn設計者)
2006-10-14 15:31:18 · answer #2 · answered by Kelvin 4 · 0⤊ 0⤋
其實他是猴子吧! 推Tiesto
2005-12-05 15:13:18 · answer #3 · answered by 小嫩b 1 · 0⤊ 0⤋
其實這3種接頭都很常見,差異在shielding的有無與接觸面的介面品質.而Cable差異在集膚效應的大小.這方面的專業,Agilent(安捷倫)這公司最熟了.(1) BNC connector
圖片參考：http://tw.wrs.yahoo.com/_ylt=At5xyhUVkffB16UWJ1KpE8d21gt.;_ylu=X3oDMTA4NDgyNWN0BHNlYwNwcm9m/SIG=12d3frkv3/EXP=1133795638/**http%3a//www.cablestogo.com/assets/product_images/29784.jpg
2005-12-04 18:17:11 · answer #4 · answered by emcsolution 7 · 0⤊ 0⤋