Soundadvisor Model 831C Event Logging Software - Option 831C-Ela - Larson Davis SoundAdvisor 831C Reference Manual

OBA Measurement System
Integration Method: Follows setting for SLM
Frequency Weightings: Independent of setting for
SLM, selected frequency weighting (A, C or Z)
indicated by 
Time Weightings/Detectors: Follows setting for
SLM, time weighting (S, F or I) indicated by 
OBA Measurements
Instantaneous "Live" Metrics:
profile graph, not stored with measurement.
OBA Live Equivalent
Level Spectrum, 1s
Overall Metrics:
OBA Overall Equivalent
Level Spectrum
OBA Overall Maximum
Level Spectrum
A.5 SoundAdvisor Model 831C Event Logging Software –
Option 831C-ELA
Measurement History
Time Period: Selectable from 1 minute to 99 hours
59 minutes
Synchronization: Selectable to sync to time-of-
day clock, for periods of 1, 2, 5, 10, 15, 20, 30
minutes, and 1, 24 hours
Measurements: Same measurements as Overall
measurement
Event History
Detection Methods: Level or Dynamic
Level Triggering: Events are initiated and stored
when the measured sound level exceeds the
trigger levels SPL1 and Peak 1 for the specified
minimum duration and ends when not triggered
for the continuation time
Dynamic Triggering: Trigger level is offset above a
background tracking level
Trigger Levels: Selectable from 0 to 200 dB for the
SPL (L ) or Peak (Lρ
ωƬ
peak
Dynamic Trigger Offset: Selectable from 3 to 99.9
dB for SPL (L ) above background tracking level
ωƬ
SoundAdvisor Model 831C
For display and
Linear Exponent Units
L L dB
ωeq(f) ωƬeq(f)
Linear Exponential
L L
ωeq(f) ωƬeq(f)
L L
ωmax(f) ωƬmax(f)
)
OBA Overall Minimum
Level Spectrum
Percentile
percentages n1 through n6 selected in SLM, 0.01 to
99.99%
Statistics are sampled every 100ms from the
selected OBA frequency weighting and time
weighting into 0.1 dB wide amplitude classes
Units
dB
dB
Dynamic Trigger Response: Selectable from five
combinations of background tracking rate and
tracking percentile
Minimum Duration: Selectable from 0 to 9.9 s
Continuation Period: Selectable from 0 to 9 s
Event Time History: Selectable On or Off
• Period: Selectable for periods 20 ms, 50 ms,
100 ms, 200 ms, 500 ms, 1 s, 2 s, and 5 s
• Pre-event Samples: Selectable from 0 to 99
• Post-event Samples: Selectable from 0 to
100
• Maximum Samples: Selectable up to 9999
• Spectral Mode: Selectable On or Off,
enables Spectral Event Time History
(requires 831C-OB3)
Event Measurements:
• Date and Time of initial occurrence
•
• Date and Time of maximum occurrence
•
• Duration of event
•
L L
Ƭmin(f) ωƬmin(f)
Spectrum Levels,
Units
1 L dB
ωƬn1(f)
2 L dB
ωƬn2(f)
3 L dB
ωƬn3(f)
4 L dB
ωƬn4(f)
5 L dB
ωƬn5(f)
6 L dB
ωƬn6(f)
yyyy-mmm-dd hh:mm:ss
yyyy-mmm-dd hh:mm:ss
hh:mm:ss.s
dB
uses same
A-14