Rockwell Automation 1440-VSE02-01RA XM-122 gSE Vibration Module - Manual (Page 76)

Publication GMSI10-UM013D-EN-P - May 2010
66 Configuration Parameters
Band Measurement Parameters
There are eight instances of the band measurement parameters, four for each
channel. Use these parameters to configure the bandwidth for each band
measurement.
Period (XM Serial Configuration
Utility only) Displays the total period of the waveform
measurement. Seconds (asynchronous sampling)
Cycles (synchronous sampling)
Number of Points (XM Serial
Configuration Utility only) Displays the number of samples in the waveform
measurement. Spectral Lines Waveform Samples
100 256
200 512
400 1024
800 2048
Window Type Type of window to be applied to the waveform
measurement prior to computing the spectrum.
•
Hanning - Most often used in predictive
maintenance. Gives fair peak amplitude accuracy,
fair peak frequency accuracy. Useful for random
type data where energy is at all frequencies.
•
Rectangular - Also known as Uniform. Gives poor
peak amplitude accuracy, good peak frequency
accuracy. Useful for impulsive or transient data.
•
Hamming - Gives fair peak amplitude accuracy,
fair peak frequency accuracy. Similar to Hanning.
•
Flat Top - Also called Sinusoidal window. Gives
good peak amplitude accuracy, poor peak
frequency accuracy for data with discrete
frequency components.
•
Kaiser Bessel - Gives fair peak amplitude
accuracy, fair peak frequency accuracy.
Options: Rectangular
Hamming
Hanning
Flat Top
Kaiser Bessel
Number of Averages Sets the number of individual data sets to be
incorporated into the average calculation. 1 = no averaging
Spectrum/Waveform Parameters
Parameter Name Description Values/Comments
Band Measurement Parameters
Parameter Name Description Values/Comments
Sets the spectrum measurement to use when
calculating band values. Options: Conventional Spectrum
gSE Spectrum
Note: The XM-122 can produce gSE
measurements only with an
accelerometer. The Eng. Units must
be set to "g" for the channel to use the
gSE Spectrum. See page 58.
XM Configuration
Utility EDS File
Spectrum Option Spectrum