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Peak count parameter Rpc is the number of profile ele­ments (see Rsm) per cm.

In accordance with DIN EN ISO 21920, the following applies:
    Rpc = 10 mm / Rsm

In accordance with DIN EN 10049 and ASME B46.1, the profile elements that exceed the upper set level of inter­section c1 (gener­ally 0.5 μm) and then fall below the lower level of intersec­tion c2 (gen­er­ally -0.5 μm) are counted.

In addition to the peak count param­eter Rpc, the parameter HSC (high spot count) is occasionally used. HSC is the number of profile peaks per cm that exceed the set level of intersection c1.