Svantek SV 971A, User Manual

Page: 287 / 305

SV 971A User Manual
– Appendixes
287
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 Lday is calculated for: T
d
≠ 0,
T
e
= 0,
T
n
= 0.
( ) ( )








=

d
T
2
0 W
d
dt p t r
T
1
log 10 Ld
Leve Leve is calculated for: T
d
= 0, T
e
≠ 0,
T
n
= 0.
( )
( )








+ =

e
T
2
0 W
e
dt p t r
T
1
log 0 1 dB 5 Le
Lnight Lnight is calculated for: T
d
= 0, T
e
= 0,
T
n
≠ 0.
( )
( )








+ =

n
T
2
0 W
n
dt p t r
T
1
log 0 1 dB 10 Ln
Lde Lde is calculated for: T
d
≠ 0,
T
e
≠ 0,
T
n
= 0.
( )




 + 
+
=
10 Le 10 Ld
10 4 10 12
4 12
1
log 10 Lde
Len Len is calculated for: T
d
= 0, T
e
≠ 0,
T
n
≠ 0.
( )




 + 
+
=
10 Ln 10 Le
10 8 10 4
8 4
1
log 10 Len
Lnd Lnd is calculated for: T
d
≠ 0,
T
e
= 0,
T
n
≠ 0.
( )




 + 
+
=
10 Ld 10 Ln
10 12 10 8
12 8
1
log 10 Lnd
Lden Lden is calculated for: T
d
≠ 0,
T
e
≠ 0,
T
n
≠ 0.
( )




 +  + 
+ +
=
10 Ln 10 Le 10 Ld
10 8 10 4 10 12
4 8 12
1
log 10 Lden
LEPd 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
h 8
T
T
log 10 Leq LEPd
e + =
Ltm3
and
Ltm5 The Ltm3 and Ltm5 results (Takt-Maximal Levels) are calculated according to the
German standard TA Lärm.