How do we measure surface roughness

Arithmetical mean roughness Ra A section of standard length is sampled from the mean line on the roughness chart. Maximum peak Ry A section of standard length is sampled from the mean line on the roughness chart. Ten-point mean roughness Rz A section of standard length is sampled from the mean line on the roughness chart.

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Extending the evaluation area from a line to the surface allows for even more reliable judgement. The roughness of corroded copper-plated surfaces can affect the quality of subsequent processing such as soldering.

Sdr and other analyses are effective at evaluating surface area, and Sa is effective at analysing the overall roughness. What is Sdr? Because resins of mated material may become scraped, Sa analysis is used to look at the smoothness of sliding surfaces. Products that employ different processing methods have smaller Sa values, allowing for improved verification results.

This allows for quantification of indices used to maintain quality. Sa and Sz analyses are effective for numerical management of film roughness. Analysing film surfaces not only helps reduce oversights but also can help with ensuring stable quality of multi-layer films, managing glossiness, and more.