We are using an AMTI (model MCA6 21") force plate which has recently developed high frequency noise and gives all round decreased force values than we would normally expect. Does anyone know what the likely possible causes for this may be? Could poor grounding account for the altered force values as well as the noise?

Blair Clatworthy
School of Physiotherapy
Otago Polytechnic, Private Bag 1910
New Zealand
Email blairc@tekotago.ac.nz