Audiometer Repair vs. Replace: When to Stop Fixing an Aging Unit

How do you know an audiometer is worth repairing again?

An audiometer is worth repairing when the failure is a single identified component, the unit has a documented calibration history showing it held within tolerance between services, and the repair cost is a fraction of a replacement unit's price. It stops being worth repairing once calibration failures start recurring across visits rather than appearing as one-off events, because recurring failures usually mean the underlying electronics or transducers are degrading broadly rather than one part wearing out. Age by itself isn't the deciding factor; a ten-year-old unit with a clean annual calibration record and one broken headphone cord is a repair, while a five-year-old unit that's failed its last two exhaustive calibrations on different frequencies is a pattern worth acting on before it fails during a testing day.

What does OSHA actually require when an audiometer's calibration starts drifting?

Under Appendix E to 29 CFR 1910.95, the annual acoustic calibration check compares the audiometer's output at each test frequency against a sound level meter, octave-band filter set, and an NBS 9A coupler, and any frequency that deviates 15 decibels or more from the reference value triggers a mandatory exhaustive calibration before the unit can be used for testing again¹. That exhaustive calibration must be performed at the intervals and procedures referenced in the standard's cited ANSI sections regardless of whether a 15 dB deviation was found, and OSHA's own 2010 standard interpretation letter confirms employers may rely on more current ANSI S3.6 editions (1989, 1996, 2004, and later) in place of the regulation's cited 1969 edition, since those editions represent the same calibration intent with updated reference values and coupler types². In practice this means a single 15 dB deviation doesn't condemn a unit; it forces a documented exhaustive calibration, and the outcome of that calibration, not the deviation itself, is what tells you whether the unit is still serviceable.

Signal	Usually means	Action
One frequency fails annual check by 15+ dB, isolated incident	Component wear or a loose connector	Exhaustive calibration, repair if needed, resume use
Multiple frequencies drift on repeat visits	Broad electronic or transducer degradation	Compare repair quote to replacement cost
Earphone or bone conduction transducer physically damaged	Transducer failure, isolated to that part	Transducer replacement and recalibration
Unit fails functional check daily, intermittently, no clear cause	Wiring or internal component fatigue	Full diagnostic before next scheduled test day

What does the daily functional check tell you that the annual calibration doesn't?

The daily functional check is a listening and output test performed before testing begins each day, confirming the unit produces clean tones at expected levels using a person with known stable thresholds or a bioacoustic simulator, and it's the first place a failing audiometer shows itself between annual calibrations³. A unit that passes its daily check consistently for months and then starts failing intermittently, with static, distorted tones, or inconsistent output, is giving an early warning the annual calibration cycle alone won't catch until the next scheduled service. That gap matters for the repair-or-replace decision: a technician who only looks at calibration certificates sees a unit that passed its last annual check, while a technician tracking daily functional check failures sees a unit degrading between calibrations. Keeping a log of functional check results, not just the pass/fail outcome, gives you the pattern that distinguishes a one-time glitch from a unit heading toward failure.

What does a repair actually cost against a replacement unit, and when does that math flip?

A single-component repair, a headphone cord, a transducer, a broken jack, typically runs a few hundred dollars including the recalibration that has to follow any repair or component swap, since recalibration is required whenever a component affecting acoustic output is replaced. A full diagnostic and board-level repair on an older unit can run close to half the cost of a new audiometer once labor, parts, and the required post-repair exhaustive calibration are added up, and that's the point where the math starts to flip: a unit that needs a second or third repair within a short service window, each one a meaningful fraction of replacement cost, is usually cheaper to replace outright once you count the cumulative repair spend plus the downtime of each repair cycle. Downtime has its own cost that's easy to leave out of the comparison. A testing day lost to a dead unit with no backup available means rescheduling employees against the OSHA annual testing deadline, and that scheduling cost doesn't show up on the repair invoice.

How Foster evaluates whether a customer's audiometer should be repaired or replaced

When Foster's technicians service a customer's audiometer and find a calibration failure, the first step is isolating whether the failure is a single component or a broader pattern, using the unit's full calibration history rather than just the current visit's results. A unit with a clean multi-year calibration record and one clearly identified failed part gets repaired and recalibrated on the spot when parts are in stock. A unit showing recurring, unrelated failures gets a straight comparison: documented cumulative repair cost plus downtime against the price of a new unit, so the customer is deciding with real numbers instead of guessing at the age of the equipment. That evaluation happens as part of Foster's standard audiometer calibration service, and customers running a full hearing conservation program can fold equipment lifecycle decisions into the same visit as their annual hearing testing and on-site testing schedule rather than treating it as a separate emergency call. For the mechanics of what each level of calibration actually verifies, see Foster's related post on audiometer exhaustive calibration under ANSI S3.6. A quote for a replacement unit includes trade-in evaluation of the retired audiometer where applicable.

Frequently Asked Questions

Does a 15 dB deviation on the annual calibration check mean the audiometer has to be replaced?

No. It means an exhaustive calibration is required before the unit can be used again. Many units pass the exhaustive calibration after a minor repair and return to service; replacement only makes sense if failures recur across multiple visits.

Does an audiometer need to be recalibrated after every repair?

Yes, if the repair touches any component affecting acoustic output, such as a transducer, headphone, or internal circuitry tied to signal generation. A recalibration confirms the repair didn't introduce a new deviation.

How long does an audiometer typically stay compliant before replacement becomes the better option?

There's no fixed service life in the regulation. The decision tracks calibration history and failure pattern, not age alone; some units stay serviceable well past a decade with routine maintenance, while others need replacement earlier if failures recur.

Is a loaner or backup audiometer required while a unit is being repaired?

OSHA doesn't require a backup unit, but without one, a repair delay can push testing past the annual deadline for affected employees. Programs with tight annual testing windows often keep a backup unit or a mobile testing provider on call for exactly this gap.

Sources

• OSHA 1910.95 Appendix E: Acoustic Calibration of Audiometers
• OSHA Standard Interpretation, 2010-04-23: Audiometer calibration and ANSI S3.6 editions
• CDC NHANES 2016 Audiometry Procedures Manual