Svantek SVAN 979 - Page 261

261
SVAN 979 User Manual - Appendixes
Special filters
• Diffuse field – compensation filter filter improving the complete instrument frequency response in
the diffuse acoustic field (see below)
• Free field – compensation filter filter improving the complete instrument frequency response in
the free acoustic field (see below)
• Windscreen – compensation filter filter improving the instrument frequency response in the free
acoustic field when windscreen SA 22 is mounted on the
microphone (see C.1.2)
SVAN 979 diffuse field compensation filter
Note: Using special filters might change the frequency response and measurement ranges of
SVAN 979. Please check the below given specification.
Linear operating ranges for LEQ measurements with Diffuse Filter
Table C.1.4. Linear operating range for the “Diffuse” filter: “LOW” for the sinusoidal signal and microphone
sensitivity 50 mV/Pa
[dB]
L
AS/F
L
BS/F
L
CS/F
L
ZS/F
L
AeqT
L
BeqT
L
CeqT
L
AE
L
Cpeak
(t
int
= 2 s)
from
to
from
to
from
to
from
to
from
to
from
to
from
to
from
to
from
to
31,5 Hz
23
80
25
103
23
117
40
120
23
80
23
103
23
117
26
83
50
120
500 Hz
23
116
25
119
23
120
40
120
23
116
23
119
23
120
26
119
50
123
1 kHz
23
120
25
120
23
120
40
120
23
120
23
120
23
120
26
123
50
123
4 kHz
23
121
25
119
23
119
40
120
23
121
23
119
23
119
26
124
50
121
8 kHz
23
119
25
117
23
117
40
120
23
119
23
117
23
117
26
122
50
117
12.5
kHz
23
115
25
114
23
114
40
120
23
115
23
114
23
114
26
118
50
114