HD 2020 acoustic calibrator
OTM Solutions Pte Ltd
The HD 2020 sound level calibrator is a portable battery operated sound source, suitable for sound level meters (portable and laboratory) and acoustic stations. It allows calibrating 1/2" microphones with mechanical dimensions compliant with IEC 61094-1 ("Measurement microphones. Part 1: Specifications for laboratory standard microphones") and IEC 61094-4 ("Measurement microphones. Part 4: Specifications for working standard microphones"). The calibration pressure levels of 94 dB and 114 dB can be selected by the keyboard. The 1000 Hz frequency cannot be changed.