Abstract: The high accuracy angle and liner encoder are used widely in metolgy and measurement.In the field of servo control for INS Mesuremend Device ,to improve the positioning accuracy and repeatability , rate accuracy and stability , The data acquisition circuit with the high multiple interpolation are applied for positioning and rate control.The data acquisition method in the Real Time System is Reaserched with a multifunctional interpolation counter circuit (IK220).The method acts markedly and effectively on the precision servo control in practice.

Key words: Optical grating, Encoder, Configure register