会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 55. 发明授权
    • Method and apparatus for measuring the surface transfer impedance of a
piece of shielded cable
    • 用于测量一根屏蔽电缆的表面传输阻抗的方法和装置
    • US4425542A
    • 1984-01-10
    • US413603
    • 1982-09-01
    • Anatoly TsaliovichJohn Kincaid
    • Anatoly TsaliovichJohn Kincaid
    • G01R27/04
    • G01R27/04
    • A method for measuring surface transfer impedance of shielded cable within a frequency range below about 1 GHz is implemented with a single test fixture. The test fixture provides a conductive cylindrical chamber which opens for installation of a sample of shielded cable. The ends of the chamber are blocked by ferrite toroids to prevent radiation of high frequency electromagnetic energy. One end of the cylindrical chamber may be externally short-circuited to the cable shielding for low frequency measurements. A current source connects between the sample shielding and the conductive chamber boundary at the other end of the chamber. Current flow at low frequencies is limited to the region between the current source and the short circuit. Current flow at high frequency is limited to the region between the toroids. The cable shielding and the fixture body beyond the toroids are short-circuited for high-frequency tests and open-circuited for low frequency tests. The induced voltage in the cable is measured through feed-throughs provided in the test fixture. The current source uses an isolation transformer to avoid ground loops in the low-frequency range.
    • 一种用于测量屏蔽电缆在低于约1GHz的频率范围内的表面传导阻抗的方法是用单个测试夹具实现的。 测试夹具提供一个导电圆柱形腔室,用于安装屏蔽电缆样本。 腔室的端部被铁氧体环形物阻挡,以防止高频电磁能的辐射。 圆柱形腔室的一端可能外部短路到电缆屏蔽层进行低频测量。 电流源在室的另一端连接在样品屏蔽和导电室边界之间。 低频电流限制在电流源与短路之间。 高频电流限制在环形线圈之间的区域。 超出环形线圈的电缆屏蔽和固定体短路,用于高频测试,并开路低频测试。 电缆中的感应电压通过测试夹具中提供的馈通来测量。 电流源使用隔离变压器来避免低频范围内的接地环路。