Svantek SV 973 - Page 149

SVAN 973 User Manual – Appendixes
149
Note: For the conformance electrical tests, the microphone
compensation must be switched off (Microphone=Off)!
Note: For the frequency response evaluation in the acoustic
coupler the microphone compensation must be switched on
(Microphone=On) and the Free-filed compensations must be
switched off (Field Comp=Off).
The Windscreen compensation is switching off automatically.
Periodical test upper frequency 8 kHz
Linear Operating Ranges
Table C.1 Linear operating ranges for the sinusoidal signal and microphone sensitivity 11 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
32
85
40
108
40
122
55
125
32
85
40
108
40
122
35
88
65
125
500 Hz
32
121
40
124
40
125
55
125
32
121
40
124
40
125
35
124
65
128
1 kHz
32
125
40
125
40
125
55
125
32
125
40
125
40
125
35
128
65
128
4 kHz
32
126
40
124
40
124
55
125
32
126
40
124
40
124
35
129
65
127
8 kHz
32
124
40
122
40
122
55
125
32
124
40
122
40
122
35
127
65
125
12.5 kHz
32
120
40
119
40
119
55
125
32
120
40
119
40
119
35
123
65
122
Note: For signals with the crest factor n > 1.41 upper measuring range of the RMS (LEQ
and SPL) is reduced. The valid upper limit can be calculated according to the below given
formula:
𝑨𝒏 = 𝟏𝟐𝟓 − 𝟐𝟎𝒍𝒐𝒈(𝒏/
√
𝟐 ), where A is the upper limit for the sinusoidal signal
Example: For the crest factor n = 10 the upper limit is A
10
= 108 dB
The starting point at which tests of level linearity shall begin 94.0 dB (74 dB for A filter @ 31.5 Hz).
Measuring frequency range of the acoustic pressure (-3 dB) 20 Hz ÷ 10 000 Hz.
Basic measurement error of the acoustic pressure < 0.7 dB (measured for the reference
conditions, see below).
Weighting filters (see part C.3)
Z according to IEC 61672-1:2013 for Class 2
A according to IEC 651 and IEC 61672-1:2013 for Class 2
B according to IEC 651 and IEC 61672-1:2013 for Class 2
C according to IEC 651 and IEC 61672-1:2013 for Class 2