Patent ID: 6166550
Filing Date: 2000-12-26
Classification: G01N

Abstract:
A testing apparatus comprising:a frame, a member rotatably secured to said frame;a charging device for applying the charge to the member, said charging device including a charging device portion thereof positioned proximate to an external periphery of the member;a mechanism for rotating the member, said mechanism operably associated with said frame; anda charge measuring device operably associated with a support for measuring an electrical field emanating from the member, said charge measuring device including a measuring device portion thereof adapted to be positioned proximate to at least one measured position, on said external periphery of the member, said mechanism cooperating with said member to rotate the member, the charge measuring device adapted to measure the charge as a function of time at the at least one measured position;wherein the testing apparatus measures at least one electrical property including permittivity associated with the member.