Overview
Coast Down Peak and Phase confirms resonance
during a coast down, but requires tachometer input from the shaft turning
speed. You want the operational vibration to excite the resonant frequencies in
the system as the equipment coasts to a stop. The measurement records the
amplitude and phase of the 1xRPM frequency. The results show a peak at any
resonant frequency. At a resonance, the phase goes through a 180-degree phase
shift.
Note: By default, the peak/phase coast down monitors the first harmonic
of the turning speed. To perform the test on a different harmonic, use a cursor
to mark a frequency before running
Coast Down Peak and Phase.