G.R.A.S. RA0045 Externally Polarized Ear Simulator According to IEC 60318-4 (60711)

Volume: 1260 mm³ @ 500 Hz
Dyn range: 25 dB(A) to 164 dB
IEC: 60318-4

The G.R.A.S. IEC 711 RA0045 Ear Simulator is an ear simulator with an input impedance closely resembling that of an average human ear. The RA0045 includes a 40AG pressure microphone and each RA0045 is individually calibrated with this specific microphone.

The RA0045 meets the requirements of IEC 60711:1981 Occluded-ear simulator for the measurement of earphones coupled to the ear by ear inserts.

The RA0045 is measured and calibrated according to the ITU-T Recommendation P.57 (08/96) “Series P: Telephone transmission quality, Objective measuring apparatus: Artificial ears”.

The RA0045 is also part of the G.R.A.S. Artificial Ear Type 43AC. It can also be used with either of the Pinna Simulators RA0056 or RA0057 to simulate a complete ear for testing telephones and loudspeakers.

Note: If it ever becomes necessary to remove the microphone from an Ear Simulator like RA0045, use the special tool RA0071.

Theoretical dynamic range lower limit with G.R.A.S. preamplifier dB(A) 25
Theoretical dynamic range upper limit with G.R.A.S. preamplifier @ +28 V / ±14 V power supply dB 153
Theoretical dynamic range upper limit with G.R.A.S. preamplifier @ +120 V / ±60 V power supply dB 164
Resonance frequency kHz 13.5
Coupler volume 1260 @ 500 Hz
Temperature range, operation °C / °F -30 to 60 / -22 to 140
Temperature coefficient @250 Hz dB/°C / dB/°F 0.05
Humidity range non condensing % RH 0 to 75
ANSI standard S3.7
IEC standard 60318-4 (former 60711)
ITU-T recommondations P.57 Type 2
CE/RoHS compliant/WEEE registered Yes/Yes, Yes
Weight g / oz 60 / 2.12

Typical frequency response