DeFelsko PosiTector RTR 3D Mode D'emploi page 23

Analysis Setup Menu
2D Parameters
2D parameters are calculated from a virtual 'trace' across the image
area. When the Orientation (pg. 23) is set to Horizontal X or Vertical
Y directions, the Evaluation Length is equal to 3.8mm, minus double
the length of the selected discard filter. When the Orientation is set to
Diagonal XY or Diagonal YX directions, the Evaluation Length is equal
to 5.4mm, minus double the length of the selected discard filter.
The 2D Parameters Menu allows the operator to select 2D
analysis parameters to be displayed by the gage (a maximum of 6
parameters can be selected from the 2D and 3D Parameter lists).
Ra (default) Roughness average: arithmetic average of the
absolute values of the profile height deviations within the evaluation
length measured from the mean line
Rq RMS roughness: root mean square average of the profile
heights within the evaluation length measured from the mean line
Rz Average maximum height of the profile: arithmetic average
of the successive values of the maximum peak to deepest valley
within each sampling interval calculated over the evaluation length.
The length of the sampling interval is equal to the cutoff length λc (pg.
23) and the number of sampling intervals is the number of whole cutoff
lengths λc that can fit within the Evaluation Length.
Rp Maximum profile peak height: the distance between the
highest point of the profile and the mean line within the evaluation
length
Rv Maximum profile valley depth: the distance between the
deepest valley and the mean line within the evaluation length
Rt Total profile height: the distance between the highest peak
and the deepest valley within the evaluation length
Rpc Peak count: number of peaks per unit length within the
evaluation length
Rpc Boundary C1: defines the boundary lines located equidistant
above and below the profile mean line. A Peak is counted after the
trace goes below the lower boundary line and above the upper
boundary line. The default is 0.5 µm.
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