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RA0045-S1 Prepolarized Ear Simulator According to IEC 60318-4 (60711)
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RA0045-S1 Prepolarized Ear Simulator According to IEC 60318-4 (60711)
GRAS RA0045-S1 is an ear simulator with an acoustic input impedance closely resembling that of an average human ear. The RA0045 includes a 40AO 1/2" prepolarized pressure microphon and each RA0045 is individually calibrated with this specific microphone.
The RA0045-S1 Prepolarized Ear Simulator is for making acoustic measurements on earphones coupled to the human ear by ear inserts such as tubes, ear moulds, or ear tips. The acoustic input impedance of RA0045-S1 closely resembles that of the human ear and, as a result, loads a sound source in very much the same way.
The RA0045-S1 complies with the following international requirements:
Key Specifications
| Polarization/Connection | 0 V / CCP |
| Theoretical dynamic range lower limit with GRAS preamplifier | 25 dB(A) |
| Dynamic range upper limit with GRAS preamplifier | 150 dB |
| Set sensitivity @ 250 Hz (±3 dB) | 12.5 mV/Pa |
| Set sensitivity @ 250 Hz (±3 dB) | -38 dB re 1V/Pa |
| Resonance frequency | 13.5 kHz |
| Coupler volume | 1260 @ 500 Hz mm³ |
| Temperature range, operation | -30 to 60 °C / -22 to 140 °F |
| Temperature coefficient @250 Hz | 0.05 dB/°C |
| Humidity range non condensing | 0 to 90 % RH |
| ANSI standard | S3.7 |
| IEC standard | 60318-4 (former 60711) |
| ITU-T recommendations | P.57 |
| Weight | 52 g / 1.8 oz |
Specifications from the official GRAS product sheet. Please refer to the attached datasheet for full details.
