Measurement Computing eZ-Analyst rev.14.1 - Manual (Page 73)

eZ-Analyst 978791 Edit Menu 4-37
When eZ-Analyst was set with a limit of 6400 spectral lines, dual band processing offered the following
benefits:
A wider range of octave band data
with no increase in block size.
A much wider range of data, in
comparison to the data from the
Single Band mode.
The use of buffered data means that
High Band and Low Band data can be
captured simultaneously.
When compared to Single Band, the
Dual Band processing mode produces
more stable, precise data, at a lower
range of frequency.
eZ-Analyst versions 5 and higher have a spectral line limit of 25600. This larger
number of spectral lines allows coverage of the same frequency range using single
band mode.
Beginning with eZ-Analyst version 5.1.45, the selection for dual band octave is
grayed-out. This is because single band mode should be used with the larger
number of spectral lines.
If you have configurations that use the dual band octave feature, then eZ-Analyst
versions 5.1.45 and higher will continue to load and run those configurations until
you re-save the configuration in single band mode.
Edit Menu > Configuration > Octave Setup Tab: Filter Panel
Weighting: Used to select no filter or one of three to obtain a dB to frequency contour that
approximates that of the human ear. The contours (A, B, and C) match human
hearing at different sound intensities.
A Weighting: filters out more bass than do the B and C weights. The A weight
is used to eliminate inaudible sounds that occur at low frequencies.
B Weighting: used to approximate the ear for medium loud sounds.
C Weighting: used to approximate the ear at very high sound levels.
Filter: Provides the means to select Analog Filter or Digital Filter.
Edit Menu > Configuration > Octave Setup Tab: Bar Type Panel
Line: Selecting “Line” sets the Octave Plot to appear in line format.
Solid: Selecting “Solid” sets the Octave Plot to appear filled-in solid, as
opposed to a line plot.
When you want to move cursors on octave plots it is best to
use the mouse and drag-and-drop action, instead of using the
frame annotation method.