NTi Audio Acoustilyzer AL1 - Manual (Page 33)

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⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
⋅ ⋅ =
∑
=
N
n
dt LEQ
n
N
LEQ
1
10
_
10
1
log 10
MIN_dt Minimum SPL value measured within the actual log interval ∆t;
time weighted value (SLOW/FAST).
MAX_dt Maximum SPL value measured within the actual log interval ∆t;
time weighted value (SLOW/FAST).
Example of an SPL/LEQ log visualized with Microsoft Excel
(without LCpeak)
LCpeak Maximum C-weighted peak sound pressure level during the
whole measurement period. The measurement period is
indicated and controlled by the measurement timer.
LCpeak_dt Maximum C-weighted peak sound pressure level during the
log interval ∆t .
SPL_Act Indicates the actual SPL level measured exactly at the end
of the log interval. Note that Leq_dt, MIN_dt and MAX_dt
characterize an interval more appropriately than this single
SPL_Act value.