Patent ID: 7642503

Claim:
A control parameter setting method for a control circuit in a measurement control system including: a measuring unit used in measurement of a workpiece and outputting a measurement signal; a control circuit for outputting a control signal based on a deviation of an output value of the measurement signal from a predetermined target value; a controller for controlling the measuring unit based on the control signal so that the output value of the measurement signal is equalized with the target value, the method comprising: a temporary measurement data obtaining step for conducting a temporary measurement by sequentially and temporarily setting a control parameter of the control circuit to N pieces of different control parameters Q i (i=1, 2, . . . , N) to obtain temporary measurement data S i based on the measurement signal output during the temporary measurement over a predetermined time; an extraction step for performing frequency analysis for each of the obtained temporary measurement data S i to extract temporary measurement data S i in which a magnitude of a frequency component corresponding to a predetermined oscillation frequency in the measurement control system is smaller than a predetermined reference value; and a control parameter setting step for setting a control parameter Q i having the largest frequency characteristics in the control parameters Q i respectively corresponding to the extracted temporary measurement data S i as the control parameter of the control circuit.