Windowing for Transient Signals
In the case where the input signal is a transient, it will by definition begin and end at zero level, and as long as it is entirely within the time record, no truncation will occur, and the analysis will be correct because the FFT sees the entire signal. It is very important that the entire transient fit into the record, and the record length is dependent upon the frequency range of the analysis. Most FFT analyzers allow the user to see the time record on the screen, so it can be assured that this condition is met.
DLI Engineering provides products and services for Predictive Maintenance including vibration analysis instruments, monitoring and diagnostic software, and consulting for CBM programs.
© 2008 DLI Engineering Corporation - All rights reserved.