Delphin ProfiMessage - 9.2.7 Measuring of phase angle

ProfiMessage
Frequency
in Hz
Rotation speed
in rpm
Pulse interval
in ms
evaluated periods
20000 — 0.05 20000
30000 — 0.033 30000
Thefollowingappliestotherange>100to30kHz:Lowergatetimesenablemeas-
urementdatatobeupdatedfaster.Highergatetimesprovidehigherres-
olution/measurementprecision.
Gate time
in milliseconds
Resolution
in Hz
5000 0.2
2000 0.5
1000 1
500... 2
250 4
9.2.7 Measuringofphaseangle
Phase angle measurement is useful only for low fre-
quencies/rotation speeds. The evaluation procedure
(see below) shows why. See also Phase of main vibra-
tion or Phase of 1X/2X/3X/xX vibration.
Phase angle definition
Thephaseangledefinitioncorrespondstoasinedefinitionassociatedwithatrig-
gerpoint.Conversiontoacosinedefinitionisexplainedbelow.
Thefollowingexamplehastwosignals.Twosignalperiodsareacquired.Signal1
hasaphaseangleof0degrees.Signal2hasaphaseangleof90degrees.Mark3
showsthetriggerpoint.
278
Delphin Technology AG
Dezember 2015
ProfiMessage Manual