3
4. SPECIFICATIONS
Applicable standards:
IEC61672-1: 2003 Class 2
IEC60651: 1979 Type 2
ANSI S1.4: 1983 Type 2
Measurement functions:
•
Main processing functions
Sound level: Current time-weighted sound pressure level A or current time-
weighted sound pressure level C
Maximum time-weighted sound pressure level A or Maximum time-weighted
sound pressure level C
•
Total range
: 30 to 130dB
•
Max. measurement level
: 130dB
•
Total linear operating range:
In accordance with IEC 61672-1, A-weighted,
1000Hz: 30dB to 130dB.
•
Level range selection
: 5 ranges in 10dB steps 30 to 90dB, 40 to 100dB,
50 to 110dB, 60 to 120dB, 70 to 130dB
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.
•
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
℃
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 sound calibrator.
Calibration check frequency is 1000Hz.
Nominal calibration level for the free field:
94.1dB
Nominal calibration level for the diffuse field:
94.0dB
