Sound level meter calibration
Calibration is a crucial process for ensuring the accuracy of a sound level meter. There are two main methods: field calibration and recalibration by the manufacturer. Field calibration involves using an acoustic calibrator on an Optimus sound level meter, which outputs a consistent sound level for the microphone to detect. The software in the meter knows what the calibrator should be, and if there's any variation between what the calibrator is outputting and what the microphone is receiving, the sound level meter can offset the difference to ensure consistent and accurate measurements against a consistent noise source.
Recalibration involves sending the sound level meter and acoustic calibrator to calibrate and verify the instruments. As with any precision instrument, components age and can be subjected to changing environments, making their performance degrade over time, leading to unreliable data. Recalibration checks all components and ensures the performance of the equipment is the same as when it was manufactured.
Calibrating a sound level meter is essential if you are measuring to any Standard, Regulations, or Guidelines. It provides peace of mind that your sound level meter is measuring consistently over a given time period, proof from the manufacturer that the sound level meter and Acoustic Calibrator are functioning normally, improved performance, and a longer lifespan if you look after it. If your sound level meter comes under warranty, it may become invalid if regular calibration is not carried out.
For field calibration, use the acoustic calibrator before and after each measurement to check your sound level meter against a verified noise source and offset any variation. This allows you to compare readings taken with a similar reading taken six months ago safe in the knowledge that any variation in performance has already been taken into account.
Calibration by annually, as some regulations state that a sound level meter should be returned every two years and the acoustic calibrator every year. However, the more often you have the sound level meter calibrated, the less risk of your measurements being questioned..