OSHA's audiometer calibration framework operates at three levels. Daily functional check (29 CFR 1910.95(h)(5)(i)): performed before each testing day using a person with known stable hearing thresholds to confirm clean tone output without distortion or interruption. If any frequency shows a 10 dB or greater deviation from the listener's known threshold, acoustic calibration is required before testing continues.
OSHA’s audiometer calibration framework operates at three levels. Daily functional check (29 CFR 1910.95(h)(5)(i)): performed before each testing day using a person with known stable hearing thresholds to confirm clean tone output without distortion or interruption. If any frequency shows a 10 dB or greater deviation from the listener’s known threshold, acoustic calibration is required before testing continues. Annual acoustic calibration (29 CFR 1910.95(h)(5)(ii)): a calibrated measurement of the audiometer’s output using laboratory instruments per Appendix E. If any frequency deviates 15 dB or more from ANSI standards, an exhaustive calibration is required. Exhaustive calibration (29 CFR 1910.95(h)(5)(iii)): a comprehensive recalibration of all audiometer parameters per ANSI S3.6, required at minimum every 2 years. This is the most rigorous level and typically requires specialized equipment. SHOEBOX: SHOEBOX’s annual calibration service performs acoustic calibration at every service interval. The advance-replacement model means no testing downtime between calibration cycles — the replacement transducer arrives calibrated and ready before the existing one is returned.
