Larson Davis System 824, Reference Manual

Page: 132 / 536

6-14 824 Reference Manual 11/8/00
In the Leq, Max, and Min interval displays the cursor posi-
tion (the vertical bar in the graph) corresponds to the SPL
level and frequency values on the left side of the display.
The up
u
and down
d
arrow keys change the record
you are viewing.
In the Leq By Time display the up
u
and down
d
arrow
keys change the frequency displayed. For each frequency the
level is shown over time for each interval period. The right
r
and left
l
arrow keys move you to the next and previ-
ous interval record.
Interval Spectral LNs can also be selected for each interval
period. Six Ln values are shown for each frequency. Also
there are six graphical displays showing spectra for each of
the six Ln values. In order to turn on the Spectral Lns for the
interval period, go to the SSA settings menu and select
“Interval” for the Specral Ln setting under the “Ln” menu.
To view the Interval Spectral LN displays, press the View
V
key and highlight “Intervals”.
Press the right
r
arrow key to access the “Interval” dis-
play menu and highlight “Ln Spectrum”.
Do the following to ensure you have
Spectral Lns for the interval period:
Go to the “Edit Settings” menu for
the SSA instrument.
In the “Ln” menu set the following
settings to [Yes] and [Interval].
Enable Ln [Yes]
Spectral LN [Interval]
In the “Interval” menu set the fol-
lowing settings to [Yes].
Intv Enable [Yes]
Intv Save Ln’s [Yes]
*Interval spectral LNs are only
available when the LOG option is
installed.