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.
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|
|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|
|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