Industrial noise measurement addresses two distinct regulatory frameworks. Occupational noise exposure assessment under EU Directive 2003/10/EC requires demonstration that daily personal noise exposure (LEX,8h) remains below the upper action value of 85 dB(A) and that peak sound pressure does not exceed 140 dB(C). Machine noise emission measurement under the Machinery Directive requires determination of sound power level for CE marking and the noise labelling requirements of EN ISO 11202.
Both applications require measurement instruments with sufficient dynamic range for industrial environments — typically 40 to 140 dB SPL — and calibration documentation that can withstand regulatory scrutiny. The measurement microphone must also be rugged enough to tolerate the dust, vibration, and temperature variation of an industrial environment without drift between calibration intervals.
Industrial vibration measurement for hand-arm vibration (HAV) and whole-body vibration (WBV) assessments uses IEPE accelerometers with the same DAQ systems used for acoustic measurement. PLACID DAQ systems with IEPE inputs support both acoustic and vibration channels simultaneously, enabling combined noise-vibration exposure assessments from a single measurement system. This is particularly useful for powered hand tools, where both noise and vibration exposure must be assessed together.
ISO 9612 requires that the measurement uncertainty be stated in the noise exposure assessment report. The calibration certificate traceability chain must be documented: the microphone serial number, the calibration laboratory accreditation status, the stated sensitivity and expanded uncertainty at the time of measurement, and the acoustic calibrator check records. PLACID ISO/IEC 17025 accredited calibration certificates provide all this information in a format directly usable for regulatory assessment reports and enforcement proceedings.