It’s a requirement of almost all noise measurement that the Sound Level Meter is calibrated before each set of measurement, can checked again afterwards (see below).

The Type 4213 is a very robust and stable Class 1 devise which preforms the necessary calibration at 94dB/ 114dB at 1000Hz.

Carrying out a calibration is easy: simply put the calibrator onto the microphone of the instrument in question and press the start button. Then follow the calibration instructions on the meter – job done.

As an example, the standard ISO1996-2:2007 Acoustics – Description, measurement and assessment of environmental noise, states: “Immediately before and after each series of measurements, a class 1…calibrator…shall be applied to the microphone to check the calibration of the entire measuring system at one or more frequencies.”

This standard also states: “It is recommended to verify the compliance of the calibrator with the requirements of IEC 60942 at least once a year”.

All of our calibrators have current Accredited Calibration certification in order to fulfil this requirement and thus maintain confidence in your measurement results.