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 internationalrequirements:
- 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 CCPpreamplifier, 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 sameway.
In accordance with ITU-T Recommendation P.57(08/96): Series P: Telephone transmission quality,Objective measuring apparatus: Artifi cial ears, Type 3.1-3.4, the RA0045-S1 can be used with thefollowing 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|
|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)|
|CE/RoHS compliant/WEEE registered||Yes/Yes/Yes|
|Weight||g / oz||60 / 2.12|
Typical frequency response