Oscillations can be measured with tilt sensors, tiedown tensions, encoder positions, total power variations of astronomical sources. Often times it's not obvious where the oscillation is coming from (eg. an oscillation in the total power when tracking a source could come from the rotary floor, feed tower, platform caused by drive system motors, platform caused by tiedown jacks, etc.. ... 15sep04: platform oscillations measured during tropical storm jeanne . ... N Accelerometer . ...