Patent ID: 7135875

Claim:
A method for testing of a substrate with several test objects with a test apparatus having a holder for the substrate, a displacement unit for the holder with a holder displacement range in x-direction and a holder displacement range in y-direction, and a contact unit for contacting of the at least one test object, whereby the contact unit has a displacement range in x-direction and/or in y-direction, and the contact unit displacement range in x-direction and/or the contact unit displacement range in y-direction are smaller than the respective holder displacement range, comprising the following steps: putting the substrate on the holder; contacting of a first test object with the contact unit, wherein the contact unit has essentially maximal the dimension of half of the holder dimension in one direction perpendicular to the optical axis; positioning of the substrate so that a first area of the first test object lies in a test range of the test apparatus; testing of the first area of the test object; displacing the substrate so that at least a further area of the first test object lies in the test range of the test apparatus; displacing the contact unit so that the position of the contact unit is essentially unchanged with respect to the first test object; testing of the further area of the test object; and displacing the contact unit and the substrate relative to each other so that a further test object can be contacted.