(from Latin: audīre, "to hear" and metria, “to measure") is a branch of audiology and the science of measuring hearing acuity for variations in sound intensity and pitch and for tonal purity, involving thresholds and differing frequencies.


Audiometer: PDD-401

  • PC based screening audiometer for the air conductive examination of hearing system
  • IEC 645-1 standard
  • Class Type 4 and Type
  • EN ISO 7029:2000 Statistical distribution of hearing threshold s as a function of age
  • Interpretation by PTA (Pure Tone Average)
  • Interpretation by Grade of Hearing Impairment


System integration

  • System integration with Piston spirometers
  • System integration into information networks
  • Health Level 7 (USA)
  • Geräte Daten Träger (Germany)


Database management system

  • Unlimited storage of patients and results
  • Full support of pre-post examinations
  • Trend analysis


Connecting to a laptop PC provides full portability in battery mode as well

  • Operating modes
  • Patient interface
  • Technical data
    - Manual
    - Semi automatic ascending iteration according to Hughson-Westlake protocol
    - Semi automatic descending iteration
    Program able automatic sequence
  • Signal types
    - Continuous
    - Pulse
    - Interrupted
  • Patient interface
    - Telephonics TDH 39 built into a Peltor noise protecting case with 40 dB attenuation
    - Patient feedback with hand switch
    - Built-in microphone to communicate with the patient

Technical Data

Frequency: 125Hz, 250Hz, 500Hz, 750Hz, 1kHz, 1.5kHz, 2kHz, 3kHz, 4kHz, 6kHz, 8kHz

Sound Pressure Level: -10dB, 110dB

Total harmonic distortion: < 1 %

Frequency deviation: < 1%

IBM/PC connection: USB port

Audiometer interface: L 150 mm * W 82 mm * H 45 mm

Weight: 210g

Power supply: External power supply not required