Delphin ProfiMessage, Hardware Manual

Page: 265 / 322

Profi Message
9.2.5.7 "Phase of main vibration" characteristic value
Phase angle measurement is useful only for low fre-
quencies/rotation speeds. The evaluation procedure
(see below) shows why. Further information on phase
angle definition and on measurement precision etc. is
available under
Measuring the phase angle.
This characteristic value can be determined only when
a cyclical digital pulse is connected to a digital input/-
counter (e.g. the square wave pulse of a rotating
shaft). This signal delivers a stable base frequency fn
as well as a phase reference or trigger signal.
The DSP normalizes the time signal (internally, hidden) to an integral multiple of
the basic frequency fn.
Using the frequency spectrum associated with the line index fn, the DSP determ-
ines the line/vibration component's phase angle 0 … 360°.
9.2.5.8 "Amplitude of the 1X/2X/3X/xX vibration" characteristic value
This characteristic value can be determined only when
a cyclical digital pulse is connected to a digital input/-
counter. This signal delivers the stable basic frequency
fn.
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Delphin Technology AG
Dezember 2015
Profi Message Manual