Integrating Sound Level Meter / EN
08/15/16 Version No. 01
6
RANGE: 60 – 120 dB. Test starting point 94 dB for all weightings and frequencies except
31.5Hz A-weighted, for which the starting point is 74 dB.
FREQUENCY
Hz
WEIGHTING
L.O.R.
dB
WEIGHTING
L.O.R.
dB
31.5
A
60.0 – 80.6
C
60.0 – 117.0
1000
A
60.0 – 120.0
C
60.0 – 120.0
4000
A
60.0 – 120.0
C
60.0 – 119.2
8000
A
60.0 – 118.9
C
60.0 – 117.0
RANGE: 70 – 130 dB. Test starting point 104 dB for all weightings and frequencies
except 31.5Hz A-weighted, for which the starting point is 84 dB.
FREQUENCY
Hz
WEIGHTING
L.O.R.
dB
WEIGHTING
L.O.R.
dB
31.5
A
70.0 – 90.6
C
70.0 – 127.0
1000
A
70.0 – 130.0
C
70.0 – 130.0
4000
A
70.0 – 130.0
C
70.0 – 129.2
8000
A
70.0 – 128.9
C
70.0 – 127.0
Frequency range:
Overall characteristics including microphone: 31.5 to 8000Hz
Frequency weighting: A, meets the requirement of IEC 61672-1 for class 2
“A” weighting.
C, meets the requirement of IEC 61672-1 for class 2
“C” weighting.
Time weighting (RMS detection): Fast, according to IEC 61672-1 class 2.
Slow, according to IEC 61672-1 class 2.
Impulse, according to IEC 61672-1 class 2.
•
Reference conditions:
Type of the acoustic field: Free
Reference sound pressure level: 94.0dB (related to 20
µ
Pa)
Reference level range: 60 to 120dB
Reference frequency: 1000Hz
Reference temperature: +23°C
Reference relative humidity: 50%RH
Reference static pressure: 101.325 kPa
Reference incidence direction: Perpendicular to the front of the microphone
diaphragm.
•
Calibration: Acoustic using calibrator SLC 1356, B&K 4231 or equivalent.
Calibration check frequency is 1000Hz.
Nominal calibration level for the free field: 94.1dB
Nominal calibration level for the diffuse field: 94.0dB
