Larson Davis 831C-FFT, Reference Manual

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SoundAdvisor Model 831C A-31
A.5 Event Logging Software (Option 831C-ELA)
Measurement History Selectable Properties:
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 Selectable Properties:
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
ω 
) or Peak (L
ρ
peak
)
Dynamic Trigger Offset : Selectable from 3 to 99.9 dB for SPL (L
ωƬ
) above
background tracking level
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
• yyyy-mmm-dd hh:mm:ss
• Date and Time of maximum occurrence
• yyyy-mmm-dd hh:mm:ss
• Duration of event
• hh:mm:ss.s