Ametek Surtronic 25, User Manual

Page: 12 / 60

Surtronic S25
Rt.
Total Height of the Profile.
Rt is the Maximum Peak to Valley Height of the Profile in the
Assessment (evaluation) Length (ln).
Rmr.
Material Ratio is the length of bearing surface (expressed
as a percentage of the evaluation length ln) at a depth below the
highest peak.
Replaces tp% - Bearing Ratio as defined in ISO 4287 - 1984
RPc.
Peak Count
The number of local peaks which project through a selectable band
centred about the mean line or a line parallel to it. The count is
determined only over the evaluation length though the results are
given in peaks per cm (or per inch)
Known as Pc before 1997
Rsk.
Skewness
Rsk is a measure of the symmetry of the profile about the mean
line.
This parameter indicates whether the spikes on the surface are
predominately negative or positive or if the profile has an even
distri- bution of peaks and valleys.
Rda.
R Delta a or Rda or RDa - Arithmetical Mean Slope
Arithmetical Mean Slope of the Profile within the Sampling
Length.
Page 1-4