G.R.A.S. RA0038 1/2'' 2cc Coupler according to IEC 60318-5

Volume: 2 cc
ANSI: S3.7
IEC: 60318-5
Special feature: For 1/2" pressure microphones

The RA0038 is for use in the acoustical measurements of insert type hearing aids and earphones.

It complies with the requirements of

  • IEC 60318-5 (60126) 2 cm3 coupler for the measurement of hearing aids and earphones coupled to the ear by ear inserts and
  • ANSI S3.7-1995 American National Standard for Coupler Calibration of Earphones.

To avoid possibly damaging the microphone, the RA0038 can be used with a microphone fitted with its protection grid, e.g. a G.R.A.S. 40AG and a suitable preamplifier, like G.R.A.S. 26AS which is a 1/4" very short preamplifier with 3 m integrated cable.

The RA0038 is also part of the G.R.A.S. 43AB Artificial Ear.

Connector type BNC
Coupler volume 2 ccm
Temperature range, operation °C / °F 0
Humidity range non condensing % RH 0 to 95
ANSI standard S3.7
IEC standard 60318-5 (former 60126)
CE/RoHS compliant/WEEE registered Yes/Yes, Yes
Weight g / oz 50 / 1.76