Patent ID: 6841986
Filing Date: 2005-01-11
Classification: G01R

Abstract:
1. An inductively coupled direct contact test probe, comprising: a handgrip comprising an electrically conductive shield; a measurement tip at a distal end of the handgrip, wherein the measurement tip is electrically isolated from the handgrip shield; a sense line coupled to the measurement tip, wherein the sense line is inside of the handgrip and electrically isolated front the handgrip shield; a toroid located at a proximal end Of the handgrip, wherein a portion of the sense line forms a primary winding in electromagnetic communication with the toroid; a first termination impedance, the first termination impedance being coupled in series with the sense line proximate to the toroid; a plurality of terms of wire, wherein the plurality of turns of wire form a secondary winding in electromagnetic communication with the toroid; a second termination impedance, the second termination impedance being coupled in series with the plurality of turns of wire; a coaxial cable having a center conductor and an outer shield conductor encircling and shielding the center conductor, wherein the center conductor is coupled to the plurality of turns of wire; and a shielded enclosure, wherein the shielded enclosure encloses the toroid, the portion of the sense line, the plurality of turns of wire, the first termination impedance and second termination impedance, whereby the shield of the handgrip, the shielded enclosure and the outer shield conductor of the coaxial cable are connected together to form a substantially continuous electrical shield.