Abstract: Apparatus and method utilized in carrying out vibrational analysis wherein the output of a vibration monitoring transducer is treated by filtering in stepped fashion over a broad spectrum of frequencies. The stepped filtering is provided utilizing minimum dwell intervals at lower frequencies as determined by the number of steps involved per given bandwidth. A readout form of continuous printing provides a histographic analysis of amplitude and frequency and, optionally, an amplitude readout with respect to elapsed time. For the histographic readout, amplitude is plotted as a series of characters in linear form commencing with half peak amplitude and extending toward peak. Test and calibration procedures are provided for facilitating on site testing as well as servicing calibration procedures.

Abstract: A visual graphical display of instantaneous mechanical vibration versus frequency over a selected frequency spectrum is presented to provide a vibration analyst with a prompt overall visual impression of the mechanical vibration characteristics of a rotating device which is under surveillance. In an alternative application, the visual display permits a rapid adjustment of an electrical bandpass filter of an associated vibration analyzer. The device employs several trains of diodes which are arranged so that one or more diode in each train is illuminated at any one moment.

Abstract: A vibration severity indicator has been developed which permits an operator to determine the severity of instantaneous vibration of a vibrating body in accordance with a vibration scale which is appropriate to the vibrating body. A DC ammeter is provided with a single scale divided into uniform segments. A selection switch is provided to permit the operator to indicate the category of the vibrating object so that the single meter scale will accurately reflect standards applicable to the category of the vibrating object. The result is accomplished by delivering an electrical signal corresponding to the instantaneous vibration level through a chain of resistance separated by contacts corresponding to the switch positions.