What is the recommended calibration frequency for a Sound Level Meter (SLM)?

The recommended calibration frequency for a Sound Level Meter (SLM) is based on ensuring that the instrument provides accurate and reliable measurements over time. Instruments like SLMs are subject to drift due to factors such as environmental conditions, usage patterns, and inherent wear and tear.

Annual factory calibration is considered essential because it allows for a comprehensive evaluation and adjustment of the device by professionals with the appropriate expertise and equipment. During this calibration, the meter is tested against certified reference standards in controlled conditions to ascertain its accuracy. This thorough process helps maintain the integrity of the measurements, ensuring they meet regulatory and safety standards.

While monthly and quarterly calibrations might be adequate for less sensitive instruments or settings with minimal variation, they do not typically provide the same level of assurance regarding long-term accuracy that annual factory calibrations do. Calibration every five years might overlook the potential performance degradations that could occur in that timeframe, thereby increasing the risk of obtaining inaccurate readings when monitoring sound levels, which could have significant implications for worker health and safety.