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SV 33B Acoustic Calibrator

10 year warranty

SV 33B Class 1 Acoustic Calibrator produces an acoustic pressure of defined level 114 dB at frequency of 1 kHz. The SV 33B is suitable for calibration of Class 1 and Class 2 sound level meters and dosimeters with 1/2 microphones.


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Reference piezoresistive sensor for monitoring generated level, pressure and temperature sensors for measurements of atmospheric conditions and a microprocessor system controlling the operation of the calibrator. Sinusoidal waveform of 1 kHz frequency is digitally generated and feeds the loudspeaker. Sampled signal from the reference piezoresistive sensor indicates the level of currently generated signal in a feedback loop. On the basis of information about the level of the signal, actual values of pressure and temperature, microprocessor adjusts amplification of the loudspeaker signal in order to produce appropriate sound pressure level in the calibrator’s chamber.

Technical Specifications SV 33B

Sound Pressure Level (SPL)114 dB
IEC 60942:2003 AccuracyClass 1
SPL Tolerance± 0.3 dB
Frequency Tolerance± 0.2 %
Total Harmonic Distortion (THD)< 0.75 %
Effective Load Volume Sensitivity0.00027 dB / mm3
Level Stabilisation Timetypically 15 s, max 30 s
Calibrated Microphones1/2” and 1/4” with SA 30 adapter
Storage Temperature Range-25 oC ÷ +70 oC
CE ClassificationEN 61010-1: 2010

EN 61326-1:2013

EN 60942:2003

Temperature Rangefrom -10 °C to +50 °C  (related SPL error ≤ ±0.15 dB)
Atmospheric Pressure Rangefrom 65 kPa to 108 kPa (related SPL error ≤ ±0.10 dB)
Humidity Rangefrom 25 % to 90 % RH (related SPL error ≤ ±0.05 dB)


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