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Re: pasco light probe oscillations



Was the 12V bulb connected to a power supply of a battery? If it was the power
supply, it could be the line frequency vs. sampling frequency thing (beats as
said in posts by other members of the list). Connect the bulb to a battery and
try again. That should make it clear if the problem is your power source, or
your interface box.

Since you have a 700 series interface, you could also elect to power your light
source with the Pasco power amplifier. If the problem is a mis-match of the
time base of the Pasco 700 with the line source, then the observed effect should
disappear when both your source frequency and your sampling frequency are coming
from the same box.

--
Hans G. Ammitzboll physics@mindless.com
Drew University Physics Dept.
Madison NJ 07940
"Grow up, not old. Be childlike, not childish."
-Me