Svantek SV 977D User Manual

242
SV 977D User Manual - Appendixes
Table C.1.3. Linear operating ranges for the High measurement range with the Diffuse Field filter (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
36
97
36
120
36
134
42
137
36
97
36
120
36
134
39
100
71
137
500 Hz
36
133
36
136
36
137
42
137
36
133
36
136
36
137
39
136
71
140
1 kHz
36
137
36
137
36
137
42
137
36
137
36
137
36
137
39
140
71
140
4 kHz
36
138
36
136
36
136
42
137
36
138
36
136
36
136
39
141
71
139
8 kHz
36
136
36
134
36
134
42
137
36
136
36
134
36
134
39
139
71
137
12.5 kHz
36
132
36
131
36
131
42
137
36
132
36
131
36
131
39
136
71
134
Linear operating ranges with the SA 22 windscreen
The SA 22 windscreen doesn’t change the linear operating ranges given in tables C.1.4 and C.1.5 (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. Both A/D converter and input amplifier overload conditions
are detected. The overload in the measurement channel (in its analogue part) and the overload of the
analogue / digital converter are both detected. The “overload” indication appears when the input signal
amplitude is 0.5 dB above the declared “Peak measurement range”.
Underrange detector
The instrument has the built-in under-range detector. The “underrange” indication appears when the Leq value
for the elapsed time or the last second SPL value is below the lower linear operating range.
Time weighting characteristics (Exponential averaging)
Slow “S“ according to IEC 61672-1:2013 for Class 1, Equivalent Time Constant 1000 ms
Fast “F” according to IEC 61672-1:2013 for Class 1, Equivalent Time Constant 125 ms
Impulse “I” according to IEC 60804:2000 for Class 1, Equivalent Time Constant 35 ms, Hold Time 1500 s
Reference conditions as per IEC 61672-1:2013
• Class of the acoustic field Free field
• Reference acoustic pressure 114.0 dB (related to 20 Pa)
• Reference frequency 1000 Hz
• Reference temperature +23°C
• Reference relative humidity 50 %
• Reference static pressure 1013.25 hPa
• Reference incidence direction perpendicular to the microphone diaphragm.

Svantek SV 977D Specifications

General

Brand	Svantek
Model	SV 977D
Category	Measuring Instruments
Language	English