Catalog excerpts
Sound calibrators. No sound measurement is correct without them. The use of sound calibrators dates back to the days when it was easier to design a stable sound calibrator than a stable sound level meter. Today, sound measuring instruments, in general, are as stable as the sound calibrators. However, measuring microphones are very delicate devices designed to fulfill very rigid specifications. This makes them vulnerable and subject to damage unless care is taken. One may therefore say that a calibrator is just as much a verification of proper operation as it is a device for readjustment of...
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Microphone to be checked Coupler Vented cavity cavity Pressure sensor (silicon microphone) Amplifier Bandpass filter Detector Oscillator Level controller LED Loudspeaker Nor1253 – the influence of ambient conditions All the sound calibrators have a very low sensitivity to the ambient pressure, humidity, temperature and the load volume. The Nor1253 and the Nor1251 are calibrated at three temperatures (–10 °C, +23 °C and 45 °C) to ensure that the output sound pressure level is well within the requirements set by the IEC 61 942 and ANSI S 1.40–1997 over the specified temperature range. The...
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P.O.Box 24, N-3421 Lierskogen, Norway Tel.: +47 3285 8900 Fax: +47 3285 2208 info@norsonic.com www.norsonic.com Distributor: Specifications Nor1253 Nor1251 Nor1252 IEC60942 (2003-01) Classification Class 1 1) Class 1 Class 2 Complies with ANSI S1.40 (1997) Yes Yes Yes Sound pressure level (re: 20ìPa) 124.0 ± 0.2 dB 114.0 ± 0.2 dB 114.0 ± 0.4 dB Frequency 250 Hz ± 0.2% 2) 1000 Hz ± 0.2% 1000 Hz ± 0.2% Distortion <1% <1% <1% Sensitivity to change in the load volume -0.00002 dB/mm3 (250Hz) +0.0003 dB/mm3 (1000Hz) +0.0003 dB/mm3 (1000Hz) +0.0003 dB/mm3 (1000Hz) Typical change in SPL per year <...
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