At 11:15 PM 3/30/2009, Scott Daniel - Turbovans wrote: >surface condition ............I want to say 'RMS' number...... >something like that - but the surface of your new disc is suppossed to be of >the correct roughness as it comes out of the box, The Root of the Mean of the Squares of the variations in surface height, typically in microns...gives a particular type of effective "average" for surface roughness -- in fact the same one that gets you the effective value of an electric power waveform that's not a true sinewave. If it *is* a true sinewave, the RMS value of voltage equals the square root of 2 times the peak value, which is easy to calculate/measure. So if your AC voltmeter doesn't claim to measure "True RMS" it will only be accurate on pure sine waves.
-- David Beierl - Providence RI USA -- http://pws.prserv.net/synergy/Vanagon/ '89 Po' White Star "Scamp" |
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