5-58 824 Reference Manual 9/29/09
The exceedance time history
includes 10 samples preceding the
event and 10 samples after the event.
The maximum number of samples
that can be stored are 128. In this
case only the first 128 samples are
stored including the 10 pre-event
samples.
Graph of Exceedance Time History - Shows graphically
all of the samples taken for the time history. These values
follow the instantaneous sound envelope determined by
short period Leq samples. As a result, it does not exhibit the
relatively slow decay characteristics associated with Slow or
Fast detectors.
Daily Views
The Daily history logs daily sound statistics including Leq
24, LDN, CNEL, Ln’s, Max, Min, and Peak data. The
measurement period is from 12:00 midnight to 12:00
midnight each day. For each hour it logs Leq, Background
Leq and the hourly Excd Leq. You can access the Daily
display by selecting Daily with the
c Check key from
within the main View menu, then cycling through the views
with the
randlarrow keys until the desired display
appears. The hourly data is accessed by pressing the
c
Check key while in the Daily-a or Daily-b displays.
Daily-a Display The Daily-a display consists of 11 major components:
• Display label
• Record Number
• Elapsed Time
• Date
• Leq Reading
• LDN and CNEL Readings
• Maximum and Minimum levels
• Peak level
The Daily-a display is shown below:
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