B&K 2250 Light Bedienungsanleitung Seite 14

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Seitenansicht 13
CHAPTER 2
Measured Quantities and Parameters
9
x is A for A-weighted, C for C-weighted or Z for Z-weighted
y is F for Fast-weighted or S for Slow-weighted
The time-weighted sound level is a continuous function of time and is expressed in decibels (dB).
L
xy
(t) is not displayed, but is the base for L
xy
(T
n
), L
xy
(SPL)(T
n
), L
xymax
(T) and L
xymin
(T).
In symbols, frequency-weighted and time-weighted sound level, L
xy
(t), at any instant of time, t, is
represented by:
where:
Table 2.1
Frequency weight-
ings according to
IEC 61672 1, Ta-
ble 2
Nominal Frequency
(Hz)
Exact Frequency
(6 digits)
(Hz)
Frequency Weightings
(1 decimal)
(dB)
ACZ
10 10 –70.4 –14.3 0.0
12.5
16
20
12.5893
15.8489
19.9526
–63.4
–56.7
–50.5
–11.2
–8.5
–6.2
0.0
0.0
0.0
25
31.5
40
25.1189
31.6228
39.8107
–44.7
–39.4
–34.6
–4.4
–3.0
–2.0
0.0
0.0
0.0
50
63
80
50.1187
63.0957
79.4328
–30.2
–26.2
–22.5
–1.3
–0.8
–0.5
0.0
0.0
0.0
100
125
160
100
125.893
158.489
–19.1
–16.1
–13.4
–0.3
–0.2
–0.1
0.0
0.0
0.0
200
250
315
199.526
251.189
316.228
–10.9
–8.6
–6.6
0.0
0.0
0.0
0.0
0.0
0.0
400
500
630
398.107
501.187
630.957
–4.8
–3.2
–1.9
0.0
0.0
0.0
0.0
0.0
0.0
800
1000
1250
794.328
1000
1258.93
–0.8
0.0
+0.6
0.0
0.0
0.0
0.0
0.0
0.0
1600
2000
2500
1584.89
1995.26
2511.89
+1.0
+1.2
+1.3
–0.1
–0.2
–0.3
0.0
0.0
0.0
3150
4000
5000
3162.28
3981.07
5011.87
+1.2
+1.0
+0.5
–0.5
–0.8
–1.3
0.0
0.0
0.0
6300
8000
10000
6309.57
7943.28
10000
–0.1
–1.1
–2.5
–2.0
–3.0
–4.4
0.0
0.0
0.0
12500
16000
20000
12589.3
15848.9
19952.6
–4.3
–6.6
–9.3
–6.2
–8.5
–11.2
0.0
0.0
0.0
L
xy
t() 20lg 1 τ()p
x
2
t
ξ()e
t ξ()τ
dξ p
0
[dB]=
BE171211.book Page 9 Thursday, May 27, 2004 1:01 PM
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