Svantek UK

SV 33B Acoustic Calibrator

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 Accuracy Class 1
SPL Tolerance ± 0.3 dB
Frequency Tolerance ± 0.2 %
Total Harmonic Distortion (THD) < 0.75 %
Effective Load Volume Sensitivity 0.00027 dB / mm3
Level Stabilisation Time typically 15 s, max 30 s
Calibrated Microphones 1/2” and 1/4” with SA 30 adapter
Storage Temperature Range -25 oC ÷ +70 oC
CE Classification EN 61010-1: 2010

EN 61326-1:2013

EN 60942:2003

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


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