Larson Davis SoundAdvisor Reference Manual page 154

6
Exceedance Metrics, exceedance levels (L1, L2, P1,
P2 and P3) selectable in dB from 0.0 to 200.0,
counts each time the level rises above the
threshold and measure the duration while above
the level minus 2dB.
Label
SPL 1 L
ωƬ > L1
SPL 2 L
ωƬ > L2
Peak 1 L
ωƬ > P1
Peak 2 L
ωƬ > P2
Peak 3 L
ωƬ > P3
Overload count and duration metrics
• Occurrences, count from 0 to 99999: nnnnn
• Overload Percentage: nnn.nn %
• Duration Overloaded: h:m:s.s
• Elapsed Run-Time: h:m:s.s
• Elapsed Pause-Time: h:m:s.s
Community Noise
• Day Night Level, midnight to midnight
• LDN
• Daytime portion of Day Night Level
• Lday (T
• Nighttime portion of Day Night Level
• LNight (T
• Day Evening Night Level, midnight to
midnight
• LDEN
• Daytime portion of Day Night Level
• LDay (T
• Evening-time portion of Day Night Level
• LEve (T
• Nighttime portion of Day Night Level
• LNight (T
C minus A
mathematical subtraction of C and A weighted
equivalent levels
Linear Exponential
L - L L
Aeq aeq AƬeq
Impulsivity
Mathematical subtraction of impulse and linear
equivalent levels
Linear Exponential
SoundAdvisor Model 831C
L dB
ωƬn6
Count Duration
0 to 99999 h:m:s.s
0 to 99999 h:m:s.s
0 to 99999 h:m:s.s
0 to 99999 h:m:s.s
0 to 99999 h:m:s.s
- T )
day night
- T
night day)
- T )
day eve
- T )
eve night
- T )
night day
Units
- L dB
aƬeq
Units
L - L
AIeq Aeq
Location, GPS (internal or external GPS, records
last fix of measurement):
• Latitude: dg m.m
• Longitude: dg m.m
• Elevation: m or feet
• Time Acquired: h:m:s
Measurement Control
Multiple control modes provide for manual and
automated measurements
Manual: Manually control measurements-- RUN,
PAUSE, RESUME, STOP, STORE
Timed Stop: Start manually and runs for set run
time (1 second to 99 hours)
Stop When Stable: Start manually and runs until
levels are stable
Continuous: Start manually or at power on and
runs without interruption, Daily Auto-Store
available, special restart after low battery features
enabled
Single Block Timer: Runs from a set date and time
to another date and time
Daily Timer: Runs for up to three time blocks per
day qualified by a start date and an end date
Measurement Status
Measurement status is indicated on the display
and with lights below the STOP and RUN keys.
Stopped Reset, Stopped, Run, Paused, Stored,
Standby
Icons on display indicate Overload, battery state
and memory status.
Back–Erase
Erase the previous five or ten seconds from a
measurement.
dB
A-8