Larson Davis 824 User Manual

5-52 824 Reference Manual 9/29/09
Exceedance History
Event recording begins when any one of the three following
conditions is satisfied:
• The instantaneous sound pressure level, Lp, exceeds the
value of SPL Exceedance Level 1 set by the user.
• The instantaneous peak level Pk-1, exceeds the value of
Pk-1 Exceedance Level set by the user.
• The instantaneous peak level Pk-2, exceeds the value of
Pk-2 Exceedance Level set by the user.
Event recording ends when all three of these levels, Lp, Pk-1
and Pk-2, are below their respective exceedance levels
minus the Hysteresis level setting. The exceedance will only
be saved if its duration is longer than the minimum duration
setting.
For further information, see sections
"LOG and SSA Triggering Settings"
on page 7-23 and "Logging SLM
Exceedance History Settings" on
page 7-40. The System 824 Training
Manual, available from Larson
Davis, is also an excellent reference.
The Exceedance view shows a record of each exceedance
recorded when the sound pressure level went over a
predetermined threshold. You can access the Excd History
view display by selecting Excd History with the
c Check
key from within the main View menu.
Excd-a Display The Excd-a display consists of six major components:
• Display Label
• Exceedance Number
• Exceedance Date / Time
• Leq Reading
• SEL Reading
• Exceedance Duration
The Excd-a display is shown below:

Larson Davis 824 Specifications

General

Brand	Larson Davis
Model	824
Category	Measuring Instruments
Language	English