Larson Davis System 824, Reference Manual

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6-6 824 Reference Manual 11/8/00
selected: A, C, or FLAT. The detector can be selected from:
Slow, Fast and Impl.
All combinations of detector and
weighting are measured simulta-
neously. The detector and weighting
selected in the “Settings” menu are
for measurements such as Ln and
Interval broadband levels.
Selectable reading - This is used to view a second level
which can be Leq, SEL, Min, Max, or Peak.
Weighting - This selection determines which weighting is
being displayed for the SPL and selectable reading. When
the selectable reading is showing Peak, the weighting for the
Peak can be set to: A, C or Flat (independent of the current
SPL frequency weighting).
Elapsed time - Displays the current run time for the mea-
surement. It resets to zero when the
R
RESET key is
pressed, pauses when the
p
PAUSE key is pressed, and
continues when the
p
PAUSE key is pressed again. The
timer is displayed as mm:ss.ss, hh:mm:ss or hhhhh:mm.
Status - Status represents the state of the instrument (as
described at the beginning of this section).
SPL history graph - This shows one second Leq readings.
The far right bar displays the current SPL readings. As read-
ings are taken, they are placed onto the scrolling graph from
right to left every second. The time axis, in the SPL history
graph, shows time increasing from left to right.
You can use the arrow keys to select the detector, weighting,
secondary parameter to be displayed and gain or range as
shown below.
Key Action
d
Moves to the next setting
u
Moves to the previous setting
l
or
r
Adjusts the current setting