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Instruction Manual
GRAS 60318-4 Ear Simulators
RA0045
Externally Polarized Ear Simulator
RA0045-S1
Prepolarized Ear Simulator
RA0045-S4
Externally Polarized Ear Simulator, High Sensitivity
RA0045-S5
Externally Polarized Ear Simulator, High Pressure
RA0045-S6
Prepolarized Ear Simulator, High Sensitivity
RA0401
Externally Polarized High-Frequency Ear Simulator
RA0402
Prepolarized High-Frequency Ear Simulator
RA0403
Externally Polarized Hi-Res Ear Simulator
RA0404
Prepolarized Hi-Res Ear Simulator
LI0071 - 6 November 2019
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Summary of Contents for GRAS 60318-4
- Page 1 Instruction Manual GRAS 60318-4 Ear Simulators RA0045 Externally Polarized Ear Simulator RA0045-S1 Prepolarized Ear Simulator RA0045-S4 Externally Polarized Ear Simulator, High Sensitivity RA0045-S5 Externally Polarized Ear Simulator, High Pressure RA0045-S6 Prepolarized Ear Simulator, High Sensitivity RA0401 Externally Polarized High-Frequency Ear Simulator...
- Page 2 Any technical documentation that is made available by GRAS is the copyrighted work of GRAS and is owned by GRAS. The content in this document is subject to change without notice. GRAS Sound & Vibration A/S is not liable or responsible for any errors or inaccuracies that may appear in this document.
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Page 3: Table Of Contents
Contents Introduction ..............................4 Components ..............................5 Characteristics ..............................5 Calibration ..............................7 Level Calibration ..............................7 Frequency Calibration ............................8 Warranty, Service and Repair........................10 Instruction Manual GRAS 60318-4 Ear Simulators | 3... -
Page 4: Introduction
Introduction The 60318-4 Ear Simulators are for making acoustic measurements on earphones coupled to the human ear by ear inserts such as tubes, ear molds or ear tips. They are delivered with a built-in pres- sure microphone and an individual calibration chart for the coupler-microphone combination. -
Page 5: Components
(do not GR0408 remove it!) External-ear Simulator GR0407 Ear Simulator housing) Fig. 1. The 60318-4 Ear Simulator as delivered (left) and its user serviceable parts (right) The following user-serviceable components are included: GR0407 Ear Simulator Housing GR0408 External-ear Simulator ... - Page 6 Fig. 3 shows the typical transfer impedance for the three main versions of the 60318-4 ear simulator, the standardized RA0045 and the newer versions with internal resonance damping, the RA0401/02 High-Frequency Ear Simulator, and the RA0403/04 Hi-Res Ear Simulator.
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Page 7: Calibration
(nominally 114 - 1.03 = 112.97 dB). See the pistonphone manual for making baro- metric corrections. 5) Switch the pistonphone off and remove it from the ear simulator. 6) Re-assemble the pistonphone. Instruction Manual GRAS 60318-4 Ear Simulators | 7... -
Page 8: Frequency Calibration
Stop Washer Transmitter Adapter The assembled components are pushed into the coupler Fig. 6. Assembled and exploded views showing how the GR0434 is used when calibrating the Ear Simula- tor. Instruction Manual GRAS 60318-4 Ear Simulators | 8... - Page 9 From signal generator To ear tones and signal analysis simulator Fig. 7. Block diagram of a complete set-up for calibration. Fig. 8. Example of a calibration result using a swept tone. Instruction Manual GRAS 60318-4 Ear Simulators | 9...
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Page 10: Warranty, Service And Repair
WEEE directive: 2002/96/EC RoHS directive: 2002/95/EC GRAS Sound & Vibration continually strives to improve the quality of our products for our custom- ers; therefore, the specifications and accessories are subject to change. Instruction Manual GRAS 60318-4 Ear Simulators | 1 0...
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