Svantek SVAN 979, Руководство пользователя

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262
SVAN 979 User Manual - Appendixes
Table C.1.5.
Linear operating range for the “Diffuse” filter: „HIGH“ (primary level range) 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
31 97
33 120
31 134 42 137 31 97 31 120 31 134 34 100
70 137
500
Hz
31 133
33 136
31 137 42 137 31 133 31 136 31 137 34 136
70 140
1 kHz
31 137
33 137
31 137 42 137 31 137 31 137 31 137 34 140
70 140
4 kHz
31 138
33 136
31 136 42 137 31 138 31 136 31 136 34 141
70 138
8 kHz
31 136
33 134
31 134 42 137 31 136 31 134 31 134 34 139
70 134
12.5
kHz
31 132 33 131 31 131 42 137 31 132 31 131 31 131 34 135 70 131
Linear operating ranges with the SA 22 windscreen
See Chapter C.1.2.
RMS detector
•
Digital
“True RMS“ with Peak detection,
•
Resolution 0.1 dB
•
Range 327.7 dB
•
Crest Factor unlimited (for signals in 20 kHz band).
Overload detector
The instrument has the built-in overload detectors. The overload in the measurement channel (in its analogue
part) and the overload of the analogue /
digital converter are both detected. The “overload” indication is when
the input signal amplitude is 0.5 dB ab
ove the declared “Peak measurement range”.
Underrange detector
The instrument has the built-
in underrange detector. The “underrange” indication appears when the minimum
value of the RMS detector output goes below the specified lower linear operating range.
Time weighting characteristics (Exponential averaging)
Slow
“
S
“ according to IEC 61672-1:2013 Class 1, Equivalent Time Constant 1000 ms
Fast
“
F
” according to IEC 61672-1:2013 Class 1, Equivalent Time Constant 125 ms
Impulse
“
I
” according to IEC 60804 Class 1, Equivalent Time Constant 35 ms, Hold Time 1500 s
Reference conditions
•
Class of the acoustic field Free field
•
Reference acoustic pressure 114.0 dB (related to 20

Pa)
•
Reference frequency 1000 Hz
•
Reference temperature
+20°C
•
Reference relative humidity 65 %
•
Reference static pressure 1013 hPa
•
Reference incidence direction perpendicular to the microphone diaphragm.