SVAN 977A User Manual - Appendixes
Time weighting characteristics (Exponential averaging)
Slow “S“ according to IEC 61672 Class 1, Equivalent Time Constant 1000 ms
Fast “F” according to IEC 61672 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.
Calibration
Acoustical - with the SV 36 sound calibrator (or equivalent):
• Calibration level for the pressure field
114.0 dB (equal to the calibrator pressure level - see calibration
chart of the used calibrator)
• Calibration level for the free field and
0 deg incidence angle
113.87 dB (equal to the calibration level for the pressure field
minus free field correction of A.C.O. 7052E at 1000 Hz – see
Table C.1.7)
Note: The above levels correspond to 114 dB of calibrator’s sound pressure. If the calibrator has
a different sound pressure than 114 dB, the calibration levels must be accordingly adjusted.
Microphone
ACO 7052E prepolarized free-field ½” condenser microphone
Nominal sensitivity 35 mV/Pa (corresponding to -29 dBV/Pa re 1 V/Pa)
Capacitance 17 pF.
Note: Maximum level of sound pressure level, which can be affect the microphone without
destruction the microphone: 155 dB.
Table C.1.6. ACO 7052E free field correction for electrostatic actuator (0 deg incidence angle)
Table C.1.7. ACO 7052E free field correction for B&K 4226 calibrator (0 deg incidence angle)
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