EN-5
•
Reference conditions:
Type of the acoustic field:
Free
Reference sound pressure level:
94.0dB (related to 20µPa)
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 calibrator ISO-TECH 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
•
Frequency for acoustic testing:
8000Hz
.
•
Warm-up time:
≦
2min
•
Sampling interval:
Bar graph indication → 125 ms approx.
Numeric indication → 1 sec approx.
•
Microphone equivalent electrical impedance (electrical input device) :
Replace
the microphone capsule with a series capacitance of 27pF +/- 3pF
Microphone:
•
Model:
MC-21
•
Nominal diameter:
1/2 inch electret condenser type
•
Sensitivity:
-37dB (0dB = 1V/Pa)
•
Frequency response:
31.5Hz to 8000Hz
•
Capacitance:
27pF
•
Reference direction and position:
Perpendicular to the front of the microphone
diaphragm at its geometric centre.
•
Maximum input sound level:
131dB at microphone for no damage.
•
Operating temperature:
-10
°
C to +50
°
C
•
Temperature coefficient:
Approx. 0.008dB/
°
C at 1000Hz
•
Dimensions:
13.2dia x 14mm
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