NextGen’s NG-SR400-T System Surface Roughness Tester can display the following Amplitude Parameters:

Rt, or the total height of the profile, is the distance measured along the evaluation length between the highest peak and the darkest valley.

Maximum profile peak height, or Rp, is the height of the peak that deviates the most from the mean line.

Maximum profile valley depth, or Rv, is the distance from the mean line that the deepest valley can be, as determined by the sampling length.

Rz, the maximum height of the profile, is usually used to determine whether the profile contains projecting peaks that could impact the function of static or sliding contacts. Its definition is based on the sampling length.

Ra, is the assessed profile’s arithmetic mean deviation determined by the sampling period. Ra is used to assess the roughness amplitude on a profile globally. It makes no mention of the profile’s form or the anomalies’ spatial frequency. Ra is significant for stochastic random surface roughness when it is machined using non-destructive methods, including sandblasting, milling, and polishing.

The standard deviation of the height distribution, based on the sampling duration, is represented by Rq, the root means square deviation of the evaluated profile. Rq offers the same details that Ra does.

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