Svantek SVAN 979 - Page 262

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 above 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.