CA115: Calibrator Type 2 114dB
IEC60942 Type 2 adapter for1 "1/2" and 1/4 "microphones
In order to reliably measure is the calibration of the measuring circuit, in practice, is of great importance. We can distinguish between when calibrating a level calibration and calibration frequency. The measurement system can be calibrated both acoustically and electrically. Virtually all sound level meters are equipped with an electric system calibration. It is a good practice to the entire measurement system to calibrate both acoustically and electrically so as to the results of comparing the electrical calibration with that of an acoustic calibration. In this way, faults can be detected in the measuring circuit.
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 as well as 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,