User Manual

Publication GMSI00-UM001A-EN-E - February 2005
114 Enpac Ex Parameters
Filter Sets the high pass filter to apply to the
measurement. The high pass filter is useful in
removing high vibration, low frequency signal
components that would dominate the signal.
Options: Off
2 Hz
200 Hz
Note: Set Filter to "Off" if you do not
want to use a filter.
Fmax The maximum frequency for the measurement. Refer to Measurement Maximum
Frequencies on page 43 for a list of
maximum frequencies supported by
the Enpac Ex.
Lines/Samples The number of lines or bins in the spectrum
measurement and the number of samples in the
waveform measurement. This determines the
measurement resolution.
Note: The data collection time increases as you
increase the measurement resolution.
For spectra: from 100 to 12800
spectral lines.
For time waveforms: from 256 to
32768 time samples.
Window Type of window to be applied to the waveform
measurement prior to computing the spectrum.
• Hanning - A general purpose window to use on
random type data when frequency resolution is
more important than amplitude accuracy. Use this
setting for most of your machinery monitoring
activities.
• Hamming - Another general purpose window with
slightly different window characteristics than the
Hanning window.
• Flat Top - Use this when amplitude accuracy is
more important than frequency resolution. In data
with closely spaced peaks, a Flat Top window may
smear the peaks together into one wide peak. Use
this for sinusoidal or calibration signals.
• Rectangular - The Enpac Ex does not apply a
window. Use this only for transient signals that die
out before the end of the time sample, or for
exactly periodic signals within the time sample.
Options: Hanning
Hamming
Flat Top
Rectangular
Averages Sets the number of individual data sets to be
incorporated into the average calculation.
Overlap The percentage of overlap during the averaging. It
can be used to reduce the total time that it takes to
collect the data.
Type Sets the type of averaging for the measurement. Options: Spectral
Time Synchronous
Offroute User Parameters
Parameter Name Description Values/Comments