Measurement-computing Medallion Rotate rev.2.3 Manuel d'utilisateur télécharger pdf (Page 25)

October 2000 Medallion Rotate Manual

WATERFALL ANALYSIS

You can perform a Waterfall analysis

on time waveform data from any

transducer. The data transducer can be a

vibration sensor (accelerometer, velocity

sensor, non-contact probe) or any other

meaningful sensor (temperature,

thickness, pressure, …).

You can use Waterfall analysis on a

data channel without a machine speed signal; however, you will not be able to

use the machine speed or order tracking

capabilities of the Waterfall plot. If you

have a tachometer signal you can create

the smooth speed curve as described in

“Processing a Tachometer Signal.” Then

you can combine the speed curve with

data from a correlated transducer in the

Waterfall analysis.

The result of the Waterfall analysis is

a series of spectra displayed on a three-dimensional (X-Y-Z) plot. The Waterfall

plot provides several useful ways of

looking at the data:

• The plot cursors can track the X

axis or the Z axis.

• You can choose frequency or

orders for the X axis and X axis

cursors.

• You can choose spectrum number,

RPM, or seconds for the Z axis and Z axis cursors. If you use order

normalization, you can also choose the number of revolutions for the Z

axis.

• You can display the data in a traditional spectral Waterfall plot, or as a

Color Contour plot. See “Contour Plot.”

Medallion Rotate can also order normalize the data so that the order-related

peaks line up exactly on the orders (when the X axis is in orders). See “Order

Normalization.”

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Measurement-computing Medallion Rotate rev.2.3 Manuel d'utilisateur Page 25