Svantek SV 971A User Manual

SV 971A User Manual – Appendixes
209
Table C.1.2. Linear operating ranges for the Low measurement range (for the sinusoidal signal and
microphone sensitivity 32 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
24
83
24
106
24
120
32
123
24
83
24
106
24
120
27
86
50
123
500 Hz
24
119
24
122
24
123
32
123
24
119
24
122
24
123
27
122
50
126
1 kHz
24
123
24
123
24
123
32
123
24
123
24
123
24
123
27
126
50
126
4 kHz
24
124
24
122
24
122
32
123
24
124
24
122
24
122
27
127
50
126
8 kHz
24
122
24
120
24
120
32
123
24
122
24
120
24
120
27
125
50
123
12.5 kHz
24
118
24
117
24
117
32
123
24
118
24
117
24
117
27
121
50
120
Note: For the 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: , where A is the upper limit for the sinusoidal signal
Example: For the crest factor n = 10 the upper limit is A10 = 120 dB
Measuring ranges
Reference measuring range of the acoustic pressure Normal
Measuring frequency range of the acoustic pressure (-3 dB) 5 Hz ÷ 20 000 Hz.
Basic measurement error of the acoustic pressure < 0.7 dB (measured for the reference
conditions, see below).
Weighting filters (see Chapter C.3)
Z meeting requirements of the IEC 61672-1:2013 standard for the Class 1 “Z“ filter
A meeting requirements of the IEC 651 and IEC 61672-1:2013 standard for the Class 1 “A” filter
B meeting requirements of the IEC 651 and IEC 61672-1:2013 standard for the Class 1 “B” filter
C meeting requirements of the IEC 651 and IEC 61672-1:2013 standard for the Class 1 “C” filter
Table C.1.3. Self-generated noise for different weighting filters
Electrical *)
Acoustical compensated
Weighting filter
Range
A
C
Z
A
C
Z
Low
< 12 dB
< 12 dB
< 20 dB
< 17 dB
< 17 dB
< 23 dB
Normal
< 16 dB
< 16 dB
< 23 dB
< 20 dB
< 20 dB
< 27 dB
*) measured with the ST 03 microphone equivalent impedance 18 pF@100kOhm ± 10%
Special filters
• Diffuse Field compensation filter that improves the complete instrument
frequency response in the diffuse acoustic field (see below)
• Windscreen compensation filter that improves the instrument frequency
response in the free acoustic field when windscreen SA 22 is
mounted on the microphone (see Chapter C.1.2)
( )
2log20137 nA
n
−=

Svantek SV 971A Specifications

General

Brand	Svantek
Model	SV 971A
Category	Measuring Instruments
Language	English