Patent ID: 7340374
Filing Date: 2008-03-04
Classification: G01D,G03F

Abstract:
1. A method of determining whether a measurement system under test (MSUT) matches a fleet including at least one other measurement system, the method comprising the steps of: calculating a tool matching precision based on a set of parameters including: a slope-induced shift offset (SISOffset) between a MSUT measurement of an artifact and a benchmark measurement of the artifact by a benchmark measurement system (BMS) and a non-linearity (σ SISoffset=υ(Process Window Size)(1-β where SISOffset is the slope-induced shift offset, υ is a user-selectable fraction of a process window size or range of the data, and β determining whether the tool matching precision meets a matching threshold, wherein the MSUT is considered matched in the case that the matching threshold is met.