New Audiometer Calibration Log

⚠ Calibrate in a quiet room (ambient noise < 40 dB SPL). Take a clear photo of the audiometer before starting. Use a calibrated SPL meter or acoustic calibrator where specified.

Job Details

Mobile / Unit *

Service Date *

Location

Technician First Name *

Technician Surname *

Machine Brand

Machine Model

Serial Number

Before You Start — Required Photo

Photo — Audiometer (Before) *

Damage Assessment

Component	Condition	Comments
External housing — check for cracks, dents, or damage
Headphones / supra-aural earphones — cups, cushions, headband
Insert earphones — ear tips, tubing, connectors
Bone vibrator — transducer, cushion, headband
All control knobs, dials, and buttons
Signal cables and connectors (fraying, bent pins)
Power supply / battery compartment
Display screen or reading scale

Service Checklist

Done	Task	Comments
	Clean external housing, knobs, and dials
	Inspect and clean headphone cushions; replace if worn
	Check insert earphone tips; replace if damaged or discoloured
	Inspect bone vibrator cushion and headband
	Test output at all frequencies: 125, 250, 500, 1000, 2000, 3000, 4000, 6000, 8000 Hz
	Verify masking noise (narrowband and speech noise) output
	Check all attenuation steps (5 dB steps across full range)
	Verify channel 1 and channel 2 (if applicable)
	Update firmware or test-tone calibration file (if applicable)
	Document ambient noise level at time of calibration

Calibration Record

Step	Method / Target	Result	Comments / Measured Value
1 kHz Reference Level	Set to 60 dB HL — verify output with SPL meter; target ±1 dB
Frequency Accuracy — 250 Hz	Verify tone frequency with frequency counter; target ±1%
Frequency Accuracy — 500 Hz	Verify tone frequency; target ±1%
Frequency Accuracy — 1 kHz	Verify tone frequency; target ±1%
Frequency Accuracy — 2 kHz	Verify tone frequency; target ±1%
Frequency Accuracy — 4 kHz	Verify tone frequency; target ±1%
Frequency Accuracy — 8 kHz	Verify tone frequency; target ±1%
Linearity Check	Step attenuator from 20 to 80 dB HL in 10 dB steps; verify linear output
Harmonic Distortion (1 kHz)	Total harmonic distortion < 2.5% at 60 dB HL
Cross-talk (if dual-channel)	Verify < -70 dB cross-talk between channels
Masking Noise Level	Verify narrowband masking at 1 kHz centre frequency ±3 dB
Final accuracy check	Compare to certified reference audiometer or calibrated SPL meter

Post-Service Functionality Check

Result	Check	Comments
	All frequencies present with no distortion or dropout
	Attenuator steps linear within ±1 dB tolerance
	Headphone / earphone cushions clean and undamaged
	All controls and buttons fully functional
	No unusual sounds, clicks, or interference
	Calibration certificate attached (if sent to accredited lab)
	Next calibration due date recorded

After Service — Required Photo

Take the same photo as before to confirm the equipment is clean and reassembled.

Photo — Audiometer (After) *

Notes & Sign-off

Technician Notes

Technician Signature (type full name)

Technician Sign-off Date

Supervisor Signature (type full name)

Supervisor Sign-off Date

Post-Service Photos / Calibration Certificate (optional)