Patent ID: 7626379

Claim:
A probe station for probing a test device, said probe station comprising: (a) a chuck suitable for supporting said test device during probing thereof; (b) an electrically conductive first enclosure at least partially enclosing said chuck and insulated therefrom; (c) an electrically conductive second enclosure interposed between and insulated from said first enclosure and said chuck, and at least partially enclosing said chuck; (d) respective electrical connections connected electrically to said chuck and said second enclosure, respectively, causing said second enclosure and said chuck to have respective potentials independent of each other; (e) said second enclosure having a first portion substantially fixedly mounted with respect to said first enclosure and a second portion movably mounted with respect to said first enclosure, said chuck and said second portion being interconnected so as to move in unison with respect to said first portion.