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I'd like to know if you get any additional information about this. I have
had a similar problem with the motion sensor attached to a CBL pointing
upward towards a mass on a spring with a styrofoam plate taped to the
underside: Good results with times of 4 or more seconds of data collection,
bad results (the sine wave interupted with erratic data) with times less
than 4s. I thought possibly I had made a programing error (I modified one
of the Vernier programs) and was telling the CBL or the detector to take
data faster than was possible (but I was too lazy to go back and check).
Although the CBL Sonic channel can take a minimum sample time of 0.008s
there is a note in the CBL System Guidebook that says the actual minimum
sample time depends on the detector (and this is not given in the sensor
info sheet).
My solution so far (until I have a chance to look at it) has been to tell
students to use 4 or more seconds...
kyle