To mems guys these days I've been measuring the capacitance change of the micromachined parallel plate and shunt switch. The analytical values and simulated one are very closed, and turned out to be around a few picofarad. However, the experimental values via HP 4284A are very unstable and inconsistent ones due to parasitic capacitance from many sources like probe tip/station or something. Would you please give me your know-how to reduce the parasitic capacitance in order to get accurate capacitance? I apprecaite your help in advance. jay _________________________________________________________________ Don’t just search. Find. Check out the new MSN Search! http://search.msn.click-url.com/go/onm00200636ave/direct/01/