Patent ID: 7400990
Filing Date: 2008-07-15
Classification: G01D

Abstract:
1. A method for performing a functional test of a position measuring system, which in the course of scanning a scale by a position measuring unit generates position values, the method comprising: generating position values by having a position measuring unit scan a scale; generating a control value in said position measuring system, said control value having a definite mathematical interrelationship with one of said position values; transmitting said control value and an associated position value to an evaluation unit located downstream of said position measuring system; making a check in said evaluation unit to determine whether there is a mathematical interrelationship between said control value and said associated position value; storing a correction value in said position measuring system under a first memory address and a second memory address; accessing said correction value at said first memory address for forming said definite mathematical interrelationship between said control value and said associated position value, wherein said making a check comprises having said evaluation unit access said correction value at said second memory address; and evaluating said position values and controlling a machine tool based on said evaluating.