Coast Down Peak Hold


Place the sensors on the bearing races in the vertical, horizontal, or both directions.


Coast Down Peak Hold checks for resonance during a coast down by holding the highest amplitude in a spectrum. When you shut down the equipment, the operational frequency may excite a suspected resonant frequency. If the vibration peak at the shaft turning speed passes through a resonant frequency during the coast down, the amplitude increases at that frequency and indicates resonance. Coast Down Peak Hold displays only the highest frequency in that range.


  1. Create a job or open Analyze from a route measurement point.
  2. From the Analyze main menu, press F7 More Experts > F4 Coast Down Peak Hold.
  3. Press Start or Enter to collect the data.
  4. Shut down the equipment.
  5. Press F3 Stop or F9 Stop when the equipment stops.
  6. Press Enter to view the data.
    One or more plots display after the data is collected.
  7. Press F9 Store Data to save the data to a route or a job, or press F8 Start to redo the measurement.