SV 977D User Manual - Appendixes
Rolling Leq measured in the time window
for the last xx minutes/seconds of the
measurement (Tw) moving with 1 second
step.
Note: If the current measurement time T is less than the time window Tw the LRxx(s) result
is undefined.
Sound Exposure Level is essentially the
subset of the Leq result. Its value is equal
to the Leq result referred to the
integration time equal to one second (so,
for the Integration time equal to 1 s, SEL
is always equal to Leq)
(
)
(
)
s1
T
log10Leqdtptrlog10SEL
T
0
2
0
+
=
=
Daily Personal Noise Exposure is the
noise exposure level for a nominal 8-hour
working day. The LEPd result is
calculated on the base of the LEQ
The Ltm3 and LTeq results (Takt-Maximal Levels) are calculated according to the German
standard TA Lärm.
Statistical level is the certain boundary
level surpassed by the temporary noise
level values in not more than n% of the
observation period
Only one result from: Lday, Leve, Lnight, Lde, Len, Lnd, and Lden is available in the
instrument. It depends on the day and night time in which the measurement was performed.
Day and night time depend on the <Day Time Limits> option (6h-18h or 7h-19h).
If <6h-18h> option is selected for the <Day Time Limits> in the instrument then:
T
d
(day-time) starts from 6 am and ends at 6 pm,
T
e
(evening-time) starts from 6 pm and ends at 10 pm,
T
n
(night-time) starts at 10 pm and ends at 6 am.
If <7h-19h> option is selected for the <Day Time Limits> in the instrument then:
T
d
(day-time) starts from 7 am and ends at 7 pm,
T
e
(evening-time) starts from 7 pm and ends at 11 pm,
T
n
(night-time) starts at 11 pm and ends at 7 am.
Lday is calculated for: T
d
≠ 0, T
e
= 0,
T
n
= 0.
( )
(
)
=
d
T
2
0W
d
dtptr
T
1
log10Ld
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