Larson Davis System 824, Reference Manual

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11/8/00 Using ID Setting Files 7-9
Fast
-
The frequency analysis uses exponential
averaging with a 1
⁄
8 second time constant which
allows more variability to appear in the measure-
ment.
RTA Weighting - (SSA)
The RTA Weighting setting allows you to display an A, C,
or Flat weighted spectrum. An overall reset is required
before this parameter can be changed.
A - Display’s an A weighted spectrum
C - Display’s a C weighted spectrum
FLT - Display’s a Flat weighted spectrum
Bandwidth Setting - (SSA)
The Bandwidth setting provides displaying of either full-
octave or third-octave bandwidth filters for real-time fre-
quency analysis. This setting has the following two options:
NOTE: The SSA instrument only mea-
sures data using 1/3 octave filters. It
sums the 1/3 octave bands to give you the
octave filter readings.
1/1 - Display’s octave band filters.
1/3 - Display’s third-octave band filters.
Common Control Settings
Control settings are also available
from some check menus as discussed
later in this chapter.The Control set-
tings are available on most System
824 instruments. The Control set-
tings can be accessed through the
“Edit Settings” menu as the last
selectable menu item. The Control settings are available on most System 824
instruments. The Control settings can be accessed through
the “Edit Settings” menu as the last selectable menu item.