CA114: Calibrator Type 2 94dB
IEC60942 Type 2 adapter for1 "1/2" and 1/4"microphones
For reliable measurement, the calibration of the measurement chain is of great importance in practice. We can distinguish between a level calibration and a frequency calibration when calibrating. The measuring system can be calibrated both acoustically and electrically. Almost all sound level meters are equipped with an electric calibration system. It is good practice to acoustically and electrically calibrate the entire measurement system to compare the results of the electrical calibration with those of an acoustic calibration. In this way errors in the measurement chain can be traced.
ABC has a very reliable acoustic calibrator in its program. This calibrator is based on a 1000 Hz stabilized oscillator that produces a sound level in a small room where the microphone is inserted. The calibrator produces a noise level of 94 dB 1000 Hz and is very suitable for use in practical situations. The calibrator complies with NEN 10942: 1989 (IEC-942, class 2). When calibrating sound level meters, the type of microphone and the electronic corrections for random and freefield must be taken into account. With a 1/2 inch. microphone the difference between freefield and pressure microphone is approximately 0.2 dB and with a random microphone approximately 0.1 dB. This means that if the sound pressure level of the calibrator gives 94 dB at 1000 Hz,