Fault diagnosis in vibration analysis relies heavily on both the FFT spectrum and time waveform analysis. These signals are influenced by two key input parameters: Maximum Frequency (Fmax) and Lines of Resolution (LOR).
Although the FFT spectrum is derived from the raw time signal, the optimal parameters chosen for FFT analysis may not always be suitable for time waveform analysis. According to best‑practice guidelines, a time waveform should capture 6 to 10 shaft revolutions to clearly reveal events. Fewer revolutions risk missing critical details, while too many can make the waveform cluttered and difficult to interpret.
The calculators below will help the vibration analysts to select the right input values (Fmax and LOR) based on equipment speed, while allowing one parameter (Fmax or LOR) to remain constant. The result is a more reliable setup for time waveform analysis only, ensuring accurate fault detection and clearer insights.
