Calibration of sound calibrators

Purpose

The national laboratories are responsible for maintaining the national reference standards for each measurement quantity and spreading metrological competence and traceability to industry and society at large. The national reference standards are the highest level of traceability in Sweden.

A calibration performed at a national laboratory fulfils all typical traceability and accreditation requirements that commonly exist in industry and society at large. 

Method

The characteristics of sound calibrators are specified in the international standard IEC 60942. Requirements and tolerances for sound pressure level, frequency, distortion and stability are among other things stated in this standard. The standard gives three classes of accuracy, LS, 1 and 2. Class LS is intended only for laboratory use while class 1 and 2 are intended for field use. These classes match the corresponding class for sound level meters.

RISE calibrates all types of sound calibrators. Parameters which are calibrated are sound pressure level, frequency and distortion. If the instrument is equipped with an accessory barometer, we check this as well at current air pressure

The recommended calibration interval is 1 year for sound calibrators.

Deliveries

The calibration results are reported in a digital calibration certificate in Swedish or English which states that the calibration was performed at a national laboratory.