en

Sa

1 symbol

Terminological databases

Metroloogia terminibaas

ID 574346 Last modified 10.05.2026
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Domain Standardisation - Metrologymeasuring procedures
  • pinna profiili ordinaadi absoluutväärtuste aritmeetiline keskmine
  • arithmetic mean of the absolute ordinate values of the surface profile
  • height parameter that is the mean of the absolute of the ordinate values of the scale-limited surface
aritmeetiline keskmine kõrgus preferred
Usage examples
  • Aritmeetiline keskmine kõrgus (profiilide puhul Pa, Wa, Ra ja pindade puhul Sa) on pinna ebatasasuste keskmine absoluutne hälve keskmisest joonest või tasapinnast valimipikkuse piires ja on pinna kareduse hindamisel kõige levinum parameeter, mis esindab absoluutsete tippude ja orgude hälvete aritmeetilist keskmist.
profiili aritmeetiline keskmine
Sa symbol
Pa, Wa, Ra symbol
profiili keskmine aritmeetiline hälve former
arithmetic mean height preferred
Usage examples
  • Arithmetical mean height (Pa, Wa, Ra for profiles, Sa for surfaces) is the average absolute deviation of surface irregularities from the mean line or plane within a sampling length, and it is the most common parameter for assessing surface roughness, representing the arithmetic average of absolute peak and valley deviations.
mean roughness Ra variant
Sa symbol
Pa, Wa, Ra symbol
roughness average former

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