Starrett SR400 Surface Roughness Tester - Manual (Page 11)

SR300 and SR400 Surface Roughness Tester
Instrument Overview
Parameter Options to Suit Your Application
The SR300/SR400 can calculate up to 22 parameters
according to your measurement application including:
Amplitude Parameters
Measures the vertical characteristics
of the surface deviations:
• Ra (Arithmetic Mean Deviation)
• Rsk (Skewness)
• Rz (Average peak to valley
height)
• Rt (Total height of profile)
• Rp (Max profile peak height)
• Rz1max (Max peak to valley
height)
Spacing Parameters
Measures the horizontal
characteristics of the surface
deviations:
• RPc (Peak count)
• RSm (Mean width of profile
elements)
Hybrid Parameters
Combinations of spacing and
amplitude parameters:
• Rmr (Material Ratio)
• Rda - R Delta a (Arithmetic
Mean Slope)
The above parameters cover the most common requirements to check
lubrication, feed rates, stresses, friction and wear properties.
Additional parameters can be analysed with the addition of Talyprofile software.