Larson Davis 824 User Manual

9/29/09 System 824 Views 5-59
The following explains each of the display’s components:
Display label - This shows the current display (for example,
“Daily-a”).
If the 824 is started at 1900 hours,
the first Daily record will run from
1900 hours to 0000 hours and then a
new day (Daily record) will begin.
Record Number - Each “Daily” record is shown in the
order that it occurred. The record number indicates the order
of the displayed Daily record in relation to the other records.
A new daily record is created each new day. A day is defined
as 12:00 midnight to 12:00 midnight.
Elasped Time - This shows the elapsed time of this day’s
measurement.
Date - This shows the day, date, month and year for this
record.
Leq Reading - This shows the Leq for the day.
LDN Reading - The DNL (Day-Night Average Sound
Level) display shows the equivalent sound level for a 24-
hour period with a +10dB weighting applied to all sounds
occurring between the times 22:00 and 07:00.
CNEL Reading - The CNEL (Community Noise Equivalent
Level) display shows the equivalent sound level for a 24-
hour period with a +5dB weighting applied to all sounds
occurring between the times 19:00 and 22:00 and a +10dB
weighting applied to all sounds occurring between the times
22:00 and 07:00.
Display label
Record Number
Date
Leq Reading
LDN and CNEL Readings
Max and Min levels
Peak levels
Elapsed time
(A new record is
created each
new day)

Larson Davis 824 Specifications

General

Brand	Larson Davis
Model	824
Category	Measuring Instruments
Language	English