Larson Davis System 824, Training Manual

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4/19/01 824 “Quick Start” 1-11
For each Interval period the following can be optionally
selected:
Broadband Measurements
The SSA instrument records several broadband measure-
ments over the total run time. This means from the time the
824 is set to run until it is stopped.
For the total run time of the instrument the following metrics
are recorded:
Metric Explanation of Metric
Six Ln values (broadband) The level that the instantaneous SPL was over for n% of the time
Six spectral Lns Six spectral Lns whose frequency band levels were over for n% of the time
Min spectrum(bin by bin minimum) Lowest instantaneous level reached for each frequency band during the interval.
@Max spectrum Instantaneous SPL of each frequency band at the occurance of the broadband Lmax
during the interval
Time
Level
Level versus Time Graph
Broadband measurements
Leq
Lmin
Lmax
Lpeak