Patent ID: 7230241

Claim:
A method of setting a measuring height of a first measurement method for measuring structure widths of trapezoidally tapering structures on a substrate wafer to a measuring height of a second measurement method for measuring the structure widths to obtain measured values for the structure width which are comparable with one another, in the setting procedure the second measurement method measuring a second structure width at an unknown second height above a surface of the substrate, and the first measurement method measuring a first structure width at a first height, the first height being set, comprising: measuring the first structure width of a test structure by using the first measurement method at the first height; determining at least one further parameter using the first measurement method to completely describe the trapezoidal form of the test structure; measuring the second structure width of the test structure using the second measurement method; determining the second height from the first structure width, the first height, the second structure width, and from the at least one further parameter; and setting the measuring height of the first measurement method to the second height of the second measurement method.