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 RA0045 is an ear simulator with an input impedance closely resembling that of an average human ear. It includes a 40AG pressure microphone and each RA0045 is individually calibrated with this specific microphone.

It meets the requirements of IEC 60318-4 "Occluded-ear simulator for the measurement of earphones coupled to the ear by ear inserts."

It 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.

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
CE/RoHS compliant/WEEE registered Yes/Yes, Yes
Weight g / oz 60 / 2.12

Typical frequency response