SVAN 977A 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 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
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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