Measurement Control; Measurement Status; Back-Erase - Larson Davis SoundAdvisor 831C Reference Manual

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
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
SoundAdvisor Model 831C
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
dB
• Time Acquired: h:m:s
A.3.6 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
A.3.7 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.
A.3.8 Back–Erase
Erase the previous five or 10 seconds from a
measurement.
A-12