G.R.A.S. RA0045-S1 Prepolarized Ear Simulator According to IEC 60318-4 (60711)

Volume: 1260 mm³ @ 500 Hz
Dyn range: 25 dB(A) to 150 dB
IEC: 60318-4

The IEC 711 Ear Simulator RA0045-S1 is for making acoustic measurements on earphones coupled to the human ear by ear inserts such astubes, ear moulds, or ear tips.

It is delivered with abuilt-in G.R.A.S. ½" prepolarized pressure microphone 40AO and an individual calibration chart for the ear simulator.
Important: The microphone should not be removed from the coupler since this will jeopardise the factory calibration.

The RA0045-S1 complies with the following international requirements:

  • IEC 60318-4 Ed. 1.OB:
    Occluded-ear simulatorfor the measurement of earphones coupled tothe ear by ear inserts.
  • ITU-T Recommendations P.57 (08/96) Series P:
    Telephone transmission quality, Objective measuringapparatus: Artifi cial ears.

It is also part of the G.R.A.S. Artificial Ear 43AC-S1.

The RA0045-S1 can be used with a standard CCP preamplifier, e.g. the 26CA 1/2" Preamplifier or the 26CB 1/4" Preamplifier fitted with an adapter. For the 1/4" preamplifier, use either the straight RA0003 Adapter or the right-angled RA0001 Adapter.

The acoustic input impedance of RA0045-S1 closely resembles that of the human ear and, as aresult, loads a sound source in very much the same way.

In accordance with ITU-T Recommendation P.57(08/96): Series P: Telephone transmission quality,Objective measuring apparatus: Artificial ears, Type 3.1-3.4, the RA0045-S1 can be used with the following G.R.A.S. pinna simulators for testing telephones:

  • RA0056 Low-leak Pinna Simulator 
  • RA0057 High-leak Pinna Simulator 
Theoretical dynamic range lower limit with G.R.A.S. preamplifier dB(A) 25
Dynamic range upper limit with G.R.A.S. CCP preamplifier dB 150
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
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