Larson Davis System 824 - Metrics-B Display

6-58 824 Reference Manual 11/8/00
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