Patent ID: 6653629
Filing Date: 2003-11-25
Classification: G01R,H01J

Abstract:
A specimen analysis instrument for inspecting a specimen by impinging a primary beam onto a surface of the specimen insulatively held to a specimen-moving mechanism mounted within a specimen chamber having a wall, detecting an electrical current induced across the specimen with a detector, and inspecting the specimen based on a resulting detector output signal, said specimen analysis instrument comprising:an amplifier having a reference input terminal and placed outside said specimen chamber to amplify the detector output signal; a first lead wire for passing the detector output signal to said outside amplifier through the wall of said specimen chamber; a conductive partition member insulatively inserted between said specimen and said specimen-moving mechanism to form a partition electrically isolated therefrom; and a second lead wire for connecting said conductive partition member with a conducting member and with said reference input terminal, said conducting member being placed around a portion of said first lead wire passing through the wall of said specimen chamber, said reference input terminal determining a reference potential for the output from said amplifier.