Sound level calibrator Nor1251, Nor1252

for sound level meters

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 fulfil 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 re-adjustment of sensitivity of sound measuring instruments. Self compensating precision class 1 acoustic calibrator! Fully certified and individual accredited calibrated to international standards. Automatically adjusts for changes in the load volume applied to the calibration cavity thereby removing the need for the manual correction of the level for the effective volume of different types of microphone. Compensates for changes in temperature, humidity and barometric pressure to remove the need for manual corrections for these parameters. Output level 114.0 ± 0.2 dB @ 1kHz. Meets the requirements of IEC 60942 class 1. Automatically switches off when the microphone is removed from the calibration cavity. Accepts 1”, ½” and ¼” cartridges by means of adaptors. Powered by a standard 9 volt battery Dimensions 40 × 109.5 mm Weight 185 g incl. battery. Accreditated calibrated