et

τ

1 symbol

Terminological databases

Metroloogia terminibaas

ID 790409 Last modified 12.03.2026
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Domain Standardisation - Metrology
surveaste
τ
pressure ratio
degree of compression
τ
  • absoluutsete staatiliste rõhkude suhe rõhumõõtekohtade vahel
  • action or state of being squished down or made smaller or more pressed together
  • ratio of the absolute (static) pressure at the downstream pressure tapping to the absolute (static) pressure at the upstream pressure tapping
surveaste
Usage examples
  • Väljalaskerõhu ja sisselaskerõhu suhet nimetatakse surveastmeks, mille suurenedes muutub mahuline efektiivsus väiksemaks ja mehaanilise pinge piiramine suuremaks.
  • Lennunduses on surveaste gaasiturbiinmootori kompressori esi- ja tagaosas mõõtmisel saadud stagnatsioonirõhu mõõdiste suhe.
τ symbol
pressure ratio
Usage examples
  • The ratio of the discharge pressure to the inlet pressure is called the pressure ratio. The volumetric efficiency becomes less, and mechanical stress limitation becomes more, pronounced as pressure ratio increases.
degree of compression
τ symbol

Metroloogia terminibaas

ID 1142061 Last modified 04.02.2026
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Domain metrologymeasuring procedures
skannimisaeg preferred
skaneerimisaeg
τ
time for scanning test
scanning mode time
τ
  • aja kulg skannimisjärjestuse esimesest kontrollipunktist kuni skannimisjärjestuse lõpuleviimise kontrollpunktini
  • skannimiskatse tegemiseks kuluv aeg
  • elapsed time from the start of the first scan sequence to the comletion of the last scan sequence for the procedure detailed
  • time taken to perform the scanning test
skannimisaeg preferred
Usage examples
  • Skannimisaeg sõltub skannitava ala mõõtmetest ja vajalike skannimiste arvust, kuid tavaliselt kestab see 15 minutit kuni 90 minutit.
skaneerimisaeg
τ symbol
τSph.Scan:k:Tact symbol
time for scanning test
Usage examples
  • The time for scanning test depends on the dimensions of the area being scanned and the number of scans required, but it typically takes between 15 minutes and 90 minutes.
scanning mode time
τ symbol
τSph.Scan:k:Tact symbol

Metroloogia terminibaas

ID 641631 Last modified 24.03.2026
View dataset
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Domain Standardisation - Metrologyunits of measurement
ajakonstant
τ
time constant
τ
  • suurus, mis iseloomustab vastust esimest järku lineaarse aeg-invariantse süsteemi astmelisele sisendile
  • aeg, mis kulub astmelise muutuse korral 63 % vastuse saamiseks
  • parameter characterizing the response to a step input of a first-order, linear time-invariant (LTI) system
  • time required to obtain a response of 63 % to a step change
ajakonstant
Usage examples
  • Eksponentsiaalselt muutuva suuruse ajakonstant on ajavahemiku kestus, mille lõpuks suuruse ja piirväärtuse vahe absoluutväärtus on vähenenud 1/e-ni selle vahe absoluutväärtusest ajavahemiku alguses, kus e on naturaallogaritmi alus, ning metroloogias on ajakonstant esimest järku lineaarse aja-invarianti peamine tunnusühik.
τ symbol
time constant
Usage examples
  • The time constant of an exponentially varying quantity is the duration of time interval at the end of which the absolute value of thge difference between the quantity and the limit has decreased to 1/e of the absolute value of this difference at the beginning of the time interval, where e is the base of natural logarithms.
τ symbol

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