Acoustic and vibration calibration laboratory

This is where the accredited work happens. Sound level meters, sound calibrators and measurement microphones are calibrated here under certificate 24-LB0054 — the three services that carry accreditation. Dosimeters, vibration transducers and preamplifiers are calibrated here too, traceably, outside that scope.

Why the room matters as much as the equipment

Acoustic calibration is unusually sensitive to the room it happens in. Microphone sensitivity varies with temperature and with ambient pressure. Some calibrator designs respond to atmospheric pressure directly. Background noise sets the floor below which nothing can be verified. A calibration performed in an uncontrolled room can be traceable on paper and still be wrong.

This is a large part of what accreditation actually assesses. An assessor is not only checking that the reference equipment is calibrated — they are checking that the environment was controlled and recorded, that the method accounts for it, and that the uncertainty budget includes it. It is why an accredited certificate and a certificate that merely mentions traceability are not the same document.

What you get back

As-found results before any adjustment. This is the part that lets you judge whether the measurements you made since the last calibration are still defensible — without it you are guessing.
As-left results after adjustment, if adjustment was needed.
The measurement uncertainty for each result, not a single figure for the certificate.
A clear statement of whether the result falls inside the accredited scope. Every certificate says which, so nobody downstream has to interpret it.

Reference equipment and conditions

Traceability: See the accreditation and traceability page