Audiometer Calibration
ANSI S3.6 & IEC 60645-1 Electroacoustic Calibration
Service Summary
Audiometer calibration is the process of verifying and adjusting an audiometer's output levels, frequency accuracy, and linearity against internationally recognized reference standards. Medology performs full electroacoustic calibration of pure-tone, speech, and diagnostic audiometers to ANSI S3.6-2018 and IEC 60645-1 specifications using NIST-traceable measurement equipment.
Why It Matters
OSHA, JCAHO, and state health departments require periodic calibration — typically annually — for audiometers used in clinical or occupational settings.
An out-of-tolerance audiometer produces inaccurate thresholds, leading to misdiagnosis, missed hearing loss, or incorrect hearing aid fittings.
Calibration certificates are required for accreditation inspections and must document traceability to NIST reference standards.
Regular calibration extends instrument lifespan by identifying transducer degradation and mechanical wear before they cause patient-facing errors.
Instruments & Platforms Covered
Diagnostic Audiometers
- Interacoustics AC40 / AC440
- Grason-Stadler GSI 61 / GSI 61e
- Natus Aurical FreeFit
- Otometrics MADSEN Astera²
Screening Audiometers
- Welch Allyn AS-3D
- Maico MA 41
- Inventis Piano
- MedRx AVANT A2D+
Portable / Handheld
- Oscilla SM-950
- SHOEBOX Audiometer
- Earscan ES3
- Amplivox 116
Don't see your model? Contact us — we service virtually all clinical audiology equipment.
Service Workflow
Intake & Serial Verification
Equipment is received, serial numbers verified against service history, and physical condition documented before any testing begins.
Electroacoustic Baseline Measurement
Output levels, frequency, linearity, and noise floor are measured on a calibrated coupler and recorded against ANSI S3.6 tolerances.
Adjustment & Correction
Any parameters found outside tolerance are adjusted using manufacturer software or hardware trimmers and re-measured to confirm correction.
Final Validation & Certification
Post-correction measurements confirm all parameters are in-tolerance. A NIST-traceable calibration certificate is issued digitally.
Standards & Regulations
Audiometer calibration must comply with a hierarchy of standards to satisfy regulatory, accreditation, and clinical requirements.
Defines tolerances for pure-tone output, frequency accuracy, linearity, THD, and noise.
International equivalent of ANSI S3.6; required for ISO 17025-accredited calibration.
Framework under which Medology's calibration laboratory operates and issues traceable certificates.
Mandates annual audiometer calibration for occupational hearing conservation programs.
Every calibration certificate includes the measurement date, technician ID, equipment serial number, reference standard used, and all measured values with pass/fail status against ANSI tolerances.
Audiometer Calibration — Request Service
Submit a request online or call for immediate assistance. Certificates issued same day.