Mitutoyo SURFTEST SJ-410 - HSC (Free): High-Spot Count

No. 99MBB765A
23-26
23.5.14 HSC (Free): High-spot count
On the evaluation profile, provide a line
*1
that is parallel to and located above the mean
line. A peak that projects above the line and is a local peak
*2
is called a “peak for high spot
count”. The number of these peaks per centimeter is called the “high spot count (HSC)”.
High-spot count (HSC)
There are 2 ways of setting the count-level: peak reference and base reference.
• Reference peak: Set the count-level based on the depth of the highest peak
*3
of the
evaluation profile. The peak depth can be set either as a percentage of Ry or as an
absolute numeric value (µm).
• Base reference: Set the count level based on distance from the mean line. The
distance from the mean line can be set either as a percentage of Ry or as an absolute
numeric value (µm).
*1: This parallel line to the mean line is called the “count level”.
*2: For an explanation of the local peak, refer to "23.5.13 S (JIS1994, Free): Mean
width of local peak" (page 23-25).
*3: For an explanation of the peaks on the evaluation profile, refer to "23.5.16 RzJIS
(JIS2001, Free), Rz (JIS1982, 1994): 10-point mean roughness" (page 23-27).
Count level
Peak reference
Base reference