At 03:52 AM 11/18/2002 -0500, you wrote:
Note that your A/D is probably sampling faster than the sensor bandwidth, which is usually 100hz or less for DC reading (non-vibration) accelerometers, so aliasing is not likely the problem. I would suspect flexing structure, unless you are using one of the really cheap unbalanced accelerometers, which might have internal vibration issues.In the A/D world, there is something called the Nyquist criteria - you need to sample at least 2x the highest frequency you expect to see, to be able to accurately 'see' the analog signal from the digital data.Therefore, it's smart to use a lowpass filter with an edge at 1/2 your sampling frequency, which I'm sure we don't have. Any frequency components above this value will completely mess up the A/D, rendering the data useless *except* the A/D shouldn't cause the max or min amplitude to exceed the real analog values.
John Carmack
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