Svantek SVAN 971, User Manual

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SVAN 971 User Manual
– Appendixes
144
Periodical test upper frequency 8 kHz
Linear Operating Ranges
Two measuring ranges
are available: “LOW” and "HIGH".
The starting point at which tests of level linearity shall begin is 94.0 dB for the frequencies specifies below.
Table C.1.1. Linear operating range:
“LOW” for the sinusoidal signal and microphone sensitivity 35 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 25 83 25 106 25 120 30 123 25 83 25 106 25 120 28 86 50 123
500
Hz
25 119 25 122 25 123 30 123 25 119 25 122 25 123 28 122 50 126
1 kHz 25 123 25 123 25 123 30 123 25 123 25 123 25 123 28 126 50 126
4 kHz 25 124 25 122 25 122 30 123 25 124 25 122 25 122 28 127 50 126
8 kHz 25 122 25 120 25 120 30 123 25 122 25 120 25 120 28 125 50 123
12.5
kHz
25 118 25 117 25 117 30 123 25 118 25 117 25 117 28 121 50 120
Table C.1.2.
Linear operating range: „HIGH“ (primary level range) for the sinusoidal signal and
microphone sensitivity 35 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 35 97 35 120 35 134 40 137 35 97 35 120 35 134 38 100 60 137
500
Hz 35 133 35 136 35 137 40 137 35 133 35 136 35 137 38 136 60 140
1 kHz 35 137 35 137 35 137 40 137 35 137 35 137 35 137 38 140 60 140
4 kHz 35 138 35 136 35 136 40 137 35 138 35 136 35 136 38 141 60 139
8 kHz 35 136 35 134 35 134 40 137 35 136 35 134 35 134 38 139 60 137
12.5
kHz
35 132 35 131 35 131 40 137 35 132 35 131 35 131 38 135 60 134
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 Low
Measuring frequency range of the acoustic pressure (-3 dB) 10
Hz ÷ 20 000 Hz.
Basic measurement error of the acoustic pressure < 0.7 dB (measured for the reference
conditions, see below).
 
2 log 20 137 n A
n
 