Once you start
a phase analysis, you should never change the amplitude units you are using.
Although we have been creating examples using displacement units, velocity
units are the most versatile and commonly used. Let's review how phase
angles are determined:
-
The strobe flash
is triggered by the arrival of the peak amplitude signal from the transducer.
-
The location of
the reference mark is determined by the moment of the strobe flash.
-
The timing of
the arrival of the peak amplitude signal determines the location of the
mark.
The key to why
amplitude units affect phase angles is that:
-
The moment the
peak signal arrives is determined by which amplitude unit is being used.
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