Description
SV 36 Class 1 Acoustic Calibrator
The SV 36 acoustic calibrator is a small, portable dual-range Class 1 device (sound source). Powered by two LR03/AAA batteries, it contains a loudspeaker producing acoustic pressure of defined level 94 db & 114 dB at frequency of 1 kHz.
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.
Specification
SV 36 Acoustic Calibrator
Calibration Signal Parameters:
| Sound Pressure Level (SPL) | 114 dB or 94 dB |
| IEC 60942:2003 Accuracy | Class 1 |
| SPL Tolerance | ± 0.3 dB |
| Frequency Tolerance | ± 0.2 |
| Total Harmonic Distortion (THD) | < 0.50 % for 94 dB < 0.75 % for 114 dB level |
General Information:
| 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 °C ÷ +70 °C |
| CE Classification | EN 61010-1: 2010 EN 61326-1:2006 EN 61326-1:2006 EN 60942:2003 |
Working Conditions:
| 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) |
Reference conditions:
| Ambient Temperature | 23 °C |
| Atmospheric Pressure | 101.3 kPa |
| Humidity | 30 % ÷ 80 % RH |
| Effective Microphone Load Volume | 250 mm3 for microphone type B&K 4134 |
Power supply:
| Battery Type | 2 x LR03 (IEC) / AAA (ANSI) alkaline batteries |
| Continuous Operating Time | 40 hours for 94 dB level, 30 hours for 114 dB level |
| Stand-by Period | around two years |
| Minimal Voltage Requirements | 2.1 V |
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