A method and apparatus for testing electromagnetic connectivity in a drill string are disclosed. The method includes transmitting a test signal down a transmission path in a drill string; receiving a reflection of the test signal; and determining from the reflection whether there is an interruption in...http://www.google.fr/patents/US20050212530?utm_source=gb-gplus-shareBrevet US20050212530 - Method and Apparatus for Testing Electromagnetic Connectivity in a Drill String
Method and Apparatus for Testing Electromagnetic Connectivity in a Drill String
