Measure phase
Phase is a measure of the relative timing between two or more signals. Phase is used as a dia-
gnostic tool to identify asset faults like imbalance and misalignment. With these faults, the
rotation frequency appears as a peak with elevated amplitude on the spectrum.
With VIBXPERT 3 you can measure phase synchronously (absolute) or cross channel (coher-
ence) for relative phase.
Synchronous phase
In synchronous phase, the amplitude and the phase angle of the vibration signal are calculated
from the RPM-synchronous components.
An absolute speed point is necessary for the near location that is created to measure syn-
chronous (absolute) phase. The trigger sensor is used as the reference.
Create near location group to measure locations simultaneously. Refer to Near location .
Cross channel phase (Coherence)
In cross channel phase there is no speed point, and multiple channels are used to find the sig-
nal amplitudes and the phase difference on the measured channels.
VIBXPERT 3 83
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