Hey Bee Lee,

Are you sure you should be using square waves. It will give you higher
harmonics. Try sine waves first. It may help.

regards,
David

> -----Original Message-----
> From: Chua Bee Lee [SMTP:eng50250@leonis.nus.edu.sg]
> Sent: Thursday, February 11, 1999 9:35 PM
> To:   MEMS@ISI.EDU
> Subject:      Multiple Resonance Frequencies
>
> Dear All,
>       I have been working on folded beams resonators using square waves
> to drive them. As I adjusted the driving frequency towards the resonance
> value, I observed resonance at smaller amplitudes  at lower frequencies
> prior to the one that I was expecting. I would appreciate if someone can
> provide some insight on that.
>
>       Thank you.
>       CHUA Bee Lee
>       Department of Mechanical and Production Engineering
>       National University of Singapore
>
>