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No. 99MBB091A
14. REFERENCE INFORMATION
14.5.33 High spot count, HSC
On the assessed profile provide a line *1 which is parallel to and located above the mean
line. A profile peak that projects above the line and has a local peak *2 is called a “peak for
high spot count”. The number of these peaks per centimeter or inch is called the “high spot
count HSC”.
Count level
Peak
reference
Base
reference
There are two methods for setting the count level: the peak reference method and the base
reference method.
● Peak reference
The count level is specified by the depth from the top line of the highest profile peak *3.
The depth from the profile peak can be set either as a percentage of the Ry value, or as a
numerical value (µm).
● Base reference
The count level is specified by the distance from the mean line. The distance from the
mean line can be set either as a percentage (between 0% and 50%) of the Ry value, or as a
numerical value (µm).
*1: This parallel line to the mean line is called a “count level”.
*2: For a description of the local peak, refer to section 14.5.31, “Mean spacing of local peaks of profile, S”.
*3: For a description of the highest peak of the assessed profile, refer to section 14.5.3, “Maximum height of the
profile, Ry (JIS’82, JIS’94)”.
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