Page 14
Sq
(PosiTector RTR-3D probes only)
Sq Root mean square roughness: the root mean square average of the measured
height deviations from the mean surface taken within the evaluation area.
3D Parameters
(PosiTector RTR-3D probes only)
Spd Areal peak density: the number of peaks per unit area (formerly known as Pd).
Sa Average roughness: the arithmetic average of the absolute values of the measured
height deviations from the mean surface taken within the evaluation area.
Sq Root mean square roughness: the root mean square average of the measured
height deviations from the mean surface taken within the evaluation area.
Sz Maximum area peak-to-valley height: the vertical distance between the maximum
peak height and the maximum valley depth. Commonly referred to as St.
Sp Maximum area peak height: the maximum height in the evaluation area with respect
to the mean surface.
Sv Maximum valley depth: the absolute value of the minimum height in the evaluation
area with respect to the mean surface.
Short Filter
(PosiTector RTR-3D probes only)
To optimize the analysis for a specific application, filters may be applied to the raw
image to remove undesirable profile characteristics prior to calculating the 2D and 3D
parameters. The short wavelength Gaussian filter attenuates features that have a
wavelength shorter than the selected size.
The following Short Filters are available:
None
0.008mm
0.025mm (default)
0.080mm