Original Publication Date: 1991-Sep-01
Included in the Prior Art Database: 2005-Apr-03
Described is a calibration disc for use by disc flatness measurement techniques. In addition to providing a flat reference, it also provides a known axial acceleration reference on the same disc. Thus, any changes of the known axial acceleration (due to clamping, age, temperature, etc.) will become apparent when measuring the flat reference portion of the disc.