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Mandatory Verification of Audiometric Equipment

A hearing threshold is only meaningful if the audiometer that measured it is telling the truth. Verify the earphones against a reference ear, not just the electronics against a meter.

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Mandatory Verification of Audiometric Equipment

A hearing threshold is only meaningful if the audiometer that measured it is telling the truth. Verify the earphones against a reference ear, not just the electronics against a meter.

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You Can't Measure an Earphone the Way You Measure a Room

An audiometer's threshold values only mean something if the sound pressure level actually delivered to the ear at each test frequency matches its reference level within tolerance. A drifted transducer can quietly shift every result it produces — clearing a worker who's actually developing hearing loss, or flagging a healthy one.

The problem is that an earphone or bone conductor can't be checked with a microphone placed in open air the way a room or a machine can — it needs to be loaded the way a real ear would load it, and checked across several parameters at once: hearing level zero, frequency response, harmonic distortion, masking noise level and acoustic impedance. Doing that manually, one parameter and one transducer at a time, is slow and leaves room for human error.

Aihua's AH388 automates that entire chain — high-precision ear simulation, computer-controlled measurement, and traceable logging — in one system built to IEC 60645 and ISO 389.


  • 5



    Parameters calibrated in a single automated run — hearing level zero, frequency response, harmonic distortion, masking noise level and acoustic impedance

  • RETSPL

    Reference Equivalent Threshold Sound Pressure Level — the reference every audiometer's output is checked against, frequency by frequency

                           Four Reasons Institutions Move to Automated Calibration

                                                                           From the accuracy question at the center of every hearing test to the throughput a busy audiology department actually needs.

Air & Bone Conduction Ear Simulation

High-precision ear simulation replicates the acoustic characteristics of a real human ear, supporting reliable, repeatable results across both air conduction and bone conduction test pathways.

Recommended: AH388 Audiometer Automatic Calibration System
Recommended: AH388 Audiometer Automatic Calibration System

Fully Automated Calibration Workflow

Computer-controlled signal generation, channel switching, parameter measurement and data logging run end-to-end, cutting manual intervention and human error while boosting throughput over conventional manual calibration.

Recommended: AH388 Audiometer Automatic Calibration System

Traceable, Auditable Mandatory Verification

A precision microphone and force sensor deliver metrological accuracy that satisfies mandatory verification requirements for medical equipment, with traceable results ready for regulatory compliance.

Recommended: AH388 Audiometer Automatic Calibration System

Standardized Diagnostic Quality

Standardized, intelligent calibration protects the accuracy and
reliability of hearing test data —safeguarding hearing-impaired patients
and helping institutions raise overall diagnostic quality.

                                                   Running an Automated Audiometer Calibration

  •           Step 1 Connect the Audiometer


    ​Couple the air and bone conduction transducers to the system's ear simulator and force sensor.

  •                   Step 2  Start the Sequence

    Launch the automated run — signal generation and channel switching proceed without manual steps in between.
  •             Step 3 Measure All Five

    Hearing level zero, frequency response, harmonic distortion, masking noise level and acoustic impedance are checked in sequence.
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                   Step 4 Log & Export

    Results are logged automatically into a traceable, auditable record ready for the compliance file.
AH388 audiometer calibration system

AH388 Audiometer Automatic Calibration System

A single automated system covering ear simulation, signal generation, measurement and logging for mandatory audiometer verification.

✓High-precision ear simulation — accurately replicates the acoustic characteristics of the human ear for reliable, repeatable air and bone conduction results.

✓Fully automated workflow — computer-controlled signal generation, channel switching, measurement and logging run end-to-end.

✓Verified metrological accuracy — a precision microphone and force sensor satisfy mandatory verification requirements for medical equipment.

✓Five parameters in one run — hearing level zero, frequency response, harmonic distortion, masking noise level and acoustic impedance.

✓Standards compliant — meets IEC 60645 (audiometric equipment) and the ISO 389 series (reference zero for audiometer calibration).

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about us
T​​​​hree Decades Building the Reference Standards Themselves
Hangzhou Aihua Instruments has been designing and manufacturing acoustic and vibration measurement instruments since 1992 — including the calibrators recommended on this page. Our sound level meters and calibrators hold National Type Approval Certificates and are CE tested, and Aihua has drafted and co-drafted national standards for sound level meters, giving us a direct hand in the requirements these instruments are built to meet.

That combination — building both the measurement instruments and the calibration references behind them, under one roof — is what lets a sensor manufacturer source a production-line reference standard from the same company whose broader instrument line already meets the standards your customers expect.

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  •             Common Questions About Audiometer Verification

  • 1. What exactly does "fully automated" mean here?

  • 2. Which five parameters does it calibrate?

  • 3. Does this replace needing a separate ear simulator or coupler?

  • 4. How does this satisfy "mandatory verification" requirements specifically?

Any questions? We look forward to hearing from you.

phone-5 Tel: +86-19012832378

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