標準號：IEC 60457-4-1978
中文標準名稱：剛性精密同軸線及其相關的精密連接器 第4部分:21mm剛性精密同軸線及其相關的中性精密同軸連接器 特性阻抗50Ω(9/21型) - 特性阻抗75Ω(6/21型)
英文標準名稱：Rigid precision coaxial lines and their associated precision connectors. Part 4 : 21 mm rigid precision coaxial line and associated hermaphroditic precision coaxial connector. Characteristic impedance 50 ohms (Type 9/21) - Characteristic impedance 75 ohms
標準類型：L91;L23
發布日期：1999/12/31 12:00:00
實施日期：1999/12/31 12:00:00
中國標準分類號：L91;L23
國際標準分類號：33.120.10;33.120.30
適用范圍：Complements IEC 457-1 by referring to various clauses and sub-clauses contained in Part 1 to which important information is added. This concerns maximum frequency, electrical length, the type designation still provisional, standard atmospheric conditions