GRAS 60318-4 User manual
Instruction Manual
Instruction Manual
Revision History
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Contents
Introduction ...................................................................................................................................................4
Components...................................................................................................................................................5
Characteristics..............................................................................................................................................5
Calibration ......................................................................................................................................................7
Warranty, Service and Repair................................................................................................................... 10
Instruction Manual
Instruction Manual
Introduction
Important!
Instruction Manual
Components
Union nut
Fig. 1. The 60318-4 Ear Simulator as delivered (left) and its user serviceable parts (right)
Characteristics
Fig. 2. Electrical equivalent diagram. The sound source is not shown in the model.
Instruction Manual
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0
5
10
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20
25
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55
100 1000 10000 100000
Transfer impedance x freq. [dB re 500 Hz]
Frequency [Hz]
RA0045
RA0401
RA0403
IEC Tolerance
Fig. 3. Comparison of the typical transfer impedance re. 500 Hz for the three main versions of the
IEC 60318-4 ear simulator.
Instruction Manual
Calibration
Level Calibration
Collar
Fig. 4. Calibration using the pistonphone
a) Unscrew pistonphone collar and remove O-ring.
b) Place coupler over the ear simulator, push gently down to the stop
c) Switch on
⅓
Instruction Manual
Frequency Calibration
Fig. 5. Assembled and exploded views of the ear simulator itemising user-serviceable accessories for indi-
vidual calibration
Fig. 6. Assembled and exploded views showing how the GR0434 is used when calibrating the Ear Simula-
tor.
Instruction Manual
Fig. 7. Block diagram of a complete set-up for calibration.
Fig. 8. Example of a calibration result using a swept tone.
Instruction Manual
Warranty, Service and Repair
Calibration
Warranty
Service and Repairs
This manual suits for next models
9
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