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Appendix
Level Linearity
(Refer IEC61672-1 paragraphs 5.5.3, 5.5.9, 9.2.2e, 9.3e, 9.3f).
All values refer to Sref = 42 mV/Pa*. The starting levels for the
level linearity tests are listed in the following tables:
Level range: Low
[dB]
Frequency
L
A
t
* L
C
t
* L
Z
t
*
L
AeqT
* L
AE
*
(t
int
= 10s)
L
Cpeak
*
31,5
Hz
from 24
to 68
starting 94
from 27
to 105
starting 94
from 30
to 108
starting 94
from 24
to 68
starting 94
from 34
to 78
starting 104
1 kHz
from 24
to 108
starting 94
from 27
to 108
starting 94
from 30
to 108
starting 94
from 24
to 108
starting 94
from 34
to 118
starting 104
from 41
to 111
4 kHz
from 24
to 109
starting 94
from 27
to 107
starting 94
from 30
to 108
starting 94
from 24
to 109
starting 94
from 34
to 119
starting 104
8 kHz
from 24
to 107
starting 94
from 27
to 105
starting 94
from 30
to 108
starting 94
from 24
to 107
starting 94
from 34
to 117
starting 104
12,5
kHz
from 24
to 104
starting 94
from 27
to 102
starting 94
from 30
to 108
starting 94
from 24
to 104
starting 94
from 34
to 114
starting 104
Level range: Mid
[dB]
Frequency
L
A
t
* L
C
t
* L
Z
t
*
L
AeqT
* L
AE
*
(t
int
= 10s)
L
Cpeak
*
31,5
Hz
from 31
to 86
starting 114
from 32
to 123
starting 114
from 35
to 126
starting 114
from 31
to 86
starting 114
from 41
to 96
starting 124
1 kHz
from 31
to 126
starting 114
from 32
to 126
starting 114
from 35
to 126
starting 114
from 31
to 126
starting 114
from 41
to 136
starting 124
from 38
to 129
4 kHz
from 31
to 127
starting 114
from 32
to 125
starting 114
from 35
to 126
starting 114
from 31
to 127
starting 114
from 41
to 137
starting 124
8 kHz
from 31
to 125
starting 114
from 32
to 123
starting 114
from 35
to 126
starting 114
from 31
to 125
starting 114
from 41
to 135
starting 124
12,5
kHz
from 31
to 122
starting 114
from 32
to 120
starting 114
from 35
to 126
starting 114
from 31
to 122
starting 114
from 41
to 132
starting 124
* If the sensitivity Sx deviates from the given data, a correction value of 20*log(Sref/Sx) has to be added.
Example: Sx = 45 mV/Pa -> correction value = 20*log(42/45) = -0.6 dB