5-66 824 Reference Manual 9/29/09
The following explains each of the display’s components:
Display label - This shows the current display (for example,
“Metrics-a”).
Leq Reading- This display shows the average level over the
elasped time.
DNL Reading - The DNL (Day-Night Average Sound
Level) display shows the equivalent sound level for the
entire measurement 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 the
entire 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.
Elapsed Time- This shows the elapsed time of the overall
measurement.
Metrics-b Display The Metrics-b display consists of six major components:
• Display label
•L
eq
Reading
•L
eq
Exceedance
•L
eq
Background
Display label
Leq Reading
DNL Reading
CNEL Reading
Elapsed Time
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