SVAN 979 User Manual - Appendixes
m-minutes running Leq is the rolling (sliding)
Leq screen for the last m minutes of
measurement (m x 60 seconds) moving with 1
second step
( )
( )
=
−
T
900T
2
0
dtptr
s60m
1
log10LRm
Note: if the current time period of the measurement is less then m minutes then LRm 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 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
Example: Let us assume that L35 is
equal to 76.8 dB. It means that during
the measurements the noise level
76.8 dB was exceeded in not more than
35% of the observation period.
Only one result from: Ld, Le, Ln, 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.
Ld 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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