Salutron SRT5000, Instruction Manual

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6.2 Reparation
If any trouble occurs, the user should not try to dismantle
and repair the gauge himself. The device should be
returned to SaluTron for checking and repair, together with
the roughness standard and a statement describing the
problem. Please get in touch with the technical services
department of our company or one of our sales agent.
7. Terminology

Surface Roughness is a component of surface texture.
It is quantified by the deviations in the direction of the
normal vector of a real surface from its ideal form. If
these deviations are large, the surface is rough; if they
are small, the surface is smooth.

Threshold wavelength is the necessary length for
evaluating the roughness profile. It may consist of one or
more sampling lengths.

Ra (Arithmetic Average) is the arithmetic mean value of
the deviation of the profile within sampling length.