RA0045-S1 Prepolarized Ear Simulator According to IEC 60318-4 (60711)

Key Features

Dynamic Range: 25 dB(A) – 150 dB
Sensitivity: 12.5 mV/Pa
Polarization Connection: 0 V / CCP
Standard: IEC 60318-4

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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