A system and method for assessing and potentially correcting for non-translational
motion in a resonance measurement apparatus is provided. The design measures the
response of an article, such as an HGA assembly including a read/write head, as
well as the excitation of a shaking device, such as a head resonance tester, and
computes a correction factor using either two or three point measurement. The correction
factor may be evaluated by subjecting the arrangement to further vibration at varying
frequencies. Measurement of the shaking device may be accomplished using an accelerometer
or by optical measurement using a light beam.