Larson Davis System 824, Справочное руководство

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11/8/00 Using ID Setting Files 7-27
Lmax - The second level the instrument stores is the
maximum level (L
max
) that has occurred during the
time history period.
Advc - Stores up to 38 different parameters with each
time history period which are user selectable, such as:
Leq, Peak, Max, Min, Takt maximal, battery voltage
and temperature. See Advanced Time History screens
below.
Resolution - (LOG, SSA)
In order to double the time history storage capacity, it is pos-
sible to reduce the resolution of the Time History record
from 0.1dB to 1.0dB.
0.1dB - Leq and the optional Other Level are stored
with the highest resolution (0.1dB) which requires 2
bytes of memory per level.
1.0dB - Leq and the optional Other Level are stored
with 1.0dB resolution which requires only 1 byte per
level stored. Levels are rounded to the nearest integer
(85.5 would be stored as 86dB and 85.4 would be
stored as 85dB).
Advanced Time History - (LOG,
SSA)
Up to 38 different parameters can be stored (LOG and SSA)
with each time history period including spectral data (SSA
only). These are all user selectable in the Advanced Time
History displays.
The Advanced Time History displays are shown below:
NOTE: RTA Leq and RTA Live are mutu-
ally exclusive, allowing you to choose
only one for each time history period.
(SSA only)
Once the Advanced Time History displays have been
selected, do the following to navigate through and setup
each display.
• Use the up
u
and down
d
and left
l
and right
r
arrow keys to move the cursor between each selec-
tion or check box.
• The Check
c
key toggles the selection on or off. The
Reset key
R
will uncheck all the items on the current
display.
The “Any Data” information stored
with the Time History is accessed
through the Time History menu
under the “View” key.