G.R.A.S. 90AA Audiometer Calibration System

Freq range:
ANSI: S.1.40, S.1.43, S.1.11, S.3.6
IEC: 60318-1 & -2

Typical applications and use

Typical users are

  • Owners of Audiometers
    • Hospitals, ENT-department (ordinary and military)
    • Hearing clinics
    • Hearing aid fitters / dispensers
  • Calibration service providers
    • Test houses / Certification labs
    • On-site calibration providers

Calibration of supra- and circum-aural and insert earphones 

Free-field calibration and audiometric booth verification 

Modular artificial ear systems according to standards

Dedicated audiometer calibration analyzer


The G.R.A.S. 90AA Audiometer Calibration System is configured to meet the requirements of modern audio-meter calibration. It is easy and fast to set up and control, and can be upgraded as your calibration needs change. Two standard packages are available and several options can be added, depending on the type and features of the audiometer and respective ear-phones connected.

The 90AA Audiometer Calibration System includes artificial ears for TDH-39/49 and HDA-200 and an audiometer calibration analyzer.

ANSI standard S1.40, S1.43, S1.11, S3.6


G.R.A.S. 43AA-S7 IEC 60318-1 & 2 Artificial Ear
G.R.A.S. 43AF-S4 Artificial Ear w/NMS 9A 6cc coupler
G.R.A.S. AA0020-CL LEMO 1B 7-pin Female - LEMO 1B 7-pin Male, Extension cable, custom length
G.R.A.S. HW1001 Audiometer Calibration Analyzer
G.R.A.S. 42AB Sound Calibrator
G.R.A.S. RA0184 Force Gauge (Newtonmeter)
G.R.A.S. KM0078 Audiometer Calibration System Suitcase
G.R.A.S. EL0001 Battery Alkaline LR6-AA 1.5V (4 pcs incl.)
G.R.A.S. LI0039 Manual


G.R.A.S. OP0001

Insert Earphone Option (IEC60318-5 2cc Reference Coupler RA0113 for 1” Microphone)
G.R.A.S. OP0002 Free-field Calibration Option (Free-field microphone 46AF, 10 m LEMO cable, tripod adapter and tripod)