公开(公告)号：US5631572A

公开(公告)日：1997-05-20

申请号：US227854

申请日：1994-04-15

申请人： Timothy W. Sheen ,  Jiann-Neng Chen ,  Stephen A. Cohen ,  Michael A. Baglino ,  Joseph F. Wrinn

发明人： Timothy W. Sheen ,  Jiann-Neng Chen ,  Stephen A. Cohen ,  Michael A. Baglino ,  Joseph F. Wrinn

IPC分类号： G01R31/02 ,  G01R31/04 ,  G01R31/303 ,  G01R31/312 ,  G01R31/315

CPC分类号： G01R31/315 ,  G01R31/046 ,  G01R31/303

摘要： An apparatus and method are disclosed for testing connections between printed circuit boards and components mounted thereon. A conductive loop is formed by forward biasing a parasitic diode that is inherently present between an integrated circuit (IC) lead and the ground plane of the IC. A magnetic field is created by an antenna mounted above the component to be tested. When the antenna is energized by an RF source, a voltage is induced in the conductive loop if the loop is continuous, i.e., if all of the connections are properly made. The voltage in the loop is measured and compared to a selected threshold to produce a pass/fail indication. This tester may be implemented as an improvement to a standard type of "bed-of-nails" printed circuit board tester. The antenna may be implemented as an array of spiral loop antennas, with adjacent antennas producing magnetic fields that are 90 degrees out of phase with each other.

摘要翻译： 公开了一种用于测试安装在其上的印刷电路板和组件之间的连接的装置和方法。 通过正向偏置固有地存在于集成电路（IC）引线和IC的接地平面之间的寄生二极管来形成导通回路。 磁场由安装在待测组件上方的天线产生。 当天线被RF源激励时，如果环路是连续的，即如果所有的连接都被适当地制造，则在导电回路中感应出电压。 测量回路中的电压并将其与选定的阈值进行比较，以产生通过/失败指示。 该测试器可以被实现为对标准类型的“床钉”印刷电路板测试器的改进。 天线可以被实现为螺旋环形天线的阵列，其中相邻的天线产生彼此相差90度的磁场。