G.R.A.S. 43AE Instruction Manual Download Page 11

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Z-axis

X-axis

Y-axis

ERP at origin of X-Y-Z axes

Fig. 7.

Showing the basic configuration for testing the microphone of a telephone handset. The ear piece lies in the plane

of the Y-Z axes. See Fig. 8 for geometrical details

Y-axis

AEN

140 mm

Lip ring

REF

136

15½°

22°

18°

12.9°

39°

13°

X-axis

ERP

Approximate

orientation of Lip

ring

Z-axis points away

from the reader

Fig. 8.

Showing where the Lip-ring should be for both AEN and REF positions. The angular distances of 39° and 13° (in

that order) will move the handset from the AEN postion to the LRGP

LI0070 – 28 June 2017

Summary of Contents for 43AE

Page 1: ...Instruction Manual 43AE Ear Simulator Kit According to ITU T Rec P57 Type 3 2 43AE S1 Ear Simulator Kit According to ITU T Rec P57 Type 3 2 prepolarized www gras dk LI0070 28 June 2017 ...

Page 2: ...ation that is made available by G R A S is the copyrighted work of G R A S and is owned by G R A S The content in this document is subject to change without notice G R A S Sound Vibration A S is not liable or responsible for any errors or inaccuracies that may appear in this document Trademarks Any other product names mentioned in this document may be trademarks or registered trade marks of their ...

Page 3: ...3 Placing the Ear Simulator on the Earpiece Earphone 8 4 Applying the Test Signal 8 Frequency Response of the 43AE 10 Warranty Service and Repair 11 Calibration 11 Warranty 11 Service and Repairs 11 Appendix The RA0045 Ear Simulator 12 Introduction 12 Components 12 Level Calibration 13 Frequency Calibration of the RA0045 15 3 LI0070 28 June 2017 ...

Page 4: ...phone included see page 4 26AC Preamplifier RA0001 Adapter RA0056 Low leak Pinna Simulator RA0057 High leak Pinna Simulator 43AE S1 Ear Simulator Kit prepolarized The 43AE S1 uses the same componets as the 43AE except RA0045 IEC 60318 4 Ear Simulator with 40AO microphone included 26CB Preamplifier When assembled as shown in Fig 1 it is ready for testing supra aural earphones telephone handsets and...

Page 5: ...ution When attach ing RA0001 to the RA0045 use only gentle finger force 26AC Preamplifier shown or 26CB RA0045 Ear Simulator screws into one of the Pinna Simulators Simulated ear canal extension Fig 2 Exploded view of all the user serviceable components of the 43AE Ear Simulator Kit 5 LI0070 28 June 2017 ...

Page 6: ...r and depending on whether this is a swept tone or pink noise will a measure the response of the earphone to the swept tone Or b measure the response of the earphone to the pink noise in terms of octave bands Items 3 and 4 could be combined in the same unit e g a computer fitted with suitable hardware and software for A D and D A conversions in order to simulate both a signal generator and an anal...

Page 7: ...ollowing sections deal in more detail with each stage of the test procedure 1 Setting up the Ear Simulator Note the terms generator and analyser refer to a set up which simultaneously sends the test signal to the earphone and analyses the signal picked up by the Ear Simulator With the Ear Simulator assembled and everything switched on proceed as follows 1 12AK Power Module Connect the free end of ...

Page 8: ... check is shown Fig 5 2 Make sure that the rubber seal of the Pinna Simulator seats firmly inside the Adapter 3 Switch the Pistonphone on 4 Set the Gain on the 12AK to 0 5 Set the analyser to either wide band or to the octave band whose centre frequency is 250 Hz 6 When conditions are stable note the reading in millivolts For a microphone of nominal sensitivity 12 5mV Pa and a nominal Pistonphone ...

Page 9: ...lly Swept Signal With everything set up as described above proceed as follows a set the generator to oscillator mode b set the analyser to flat response c initiate a constant level logarithmic sweep 3 on the generator The analyser will follow the response of the Ear Simulator to the earphone throughout the sweep and record and display the results accordingly Pink noise With everything set up as de...

Page 10: ...t of a telephone see Fig 7 and Fig 8 Fig 5 6 shows the frequency response of an IEC 60711 Ear Simulator Type 43AE fitted with a Low leak Pinna Simulator RA0056 for both open and closed ear conditions At any given fre quency f the corresponding difference f between the sound levels at the ERP and DRP is given as follows f DRPL f ERPL f In certain cases for example when testing telephones ERPL f cou...

Page 11: ...Z axes See Fig 8 for geometrical details Y axis AEN 140mm Lip ring REF 136mm 15 22 18 12 9 39 13 X axis ERP Approximate orientation of Lip ring Z axis points away from the reader Fig 8 Showing where the Lip ring should be for both AEN and REF positions The angular distances of 39 and 13 in that order will move the handset from the AEN postion to the LRGP 11 LI0070 28 June 2017 ...

Page 12: ...st defective materials and workmanship The warranty does not cover products that are damaged due to negligent use an incorrect power supply or an incorrect connection to the equipment Service and Repairs All repairs are made at G R A S International Support Center located in Denmark Our Support Center is equipped with the newest test equipment and staffed with dedicated and highly skilled engineer...

Page 13: ...s IEC 60318 4 Occluded ear simulator for the measurement of earphones coupled to the ear by ear inserts ITU T Recommendations P 57 Series P Telephone transmission quality Objective measuring apparatus Artificial ears Components It comprises the following user serviceable components GR0407 Ear Simulator Housing GR0408 External ear Simulator GR0409 Union Nut The RA0045 is delivered as shown in Fig 9...

Page 14: ...umber of carefully designed volumes connected via well defined and precisely tuned resistive grooves In an equivalent electrical circuit capacitors would represent the volumes and inductance and resistance would represent respectively air mass and air flow within the resistive groves Fig 10 shows a typical coupler frequency response of the RA0045 Fig 10 Type RA0045 typical coupler frequency respon...

Page 15: ...collar of the Pistonphone and remove the O ring see Fig 11 Entrance to Pistonphone coupler O ring Collar RA0045 Ear Simulator Fig 11 Calibration using the Pistonphone a Unscrew Pistonphone collar and remove O ring b Place coupler over RA0045 push gently down to the stop c Switch on 3 Place the coupler of the Pistonphone over the RA0045 push it gently down to the stop and switch on 4 Set the analys...

Page 16: ...The computer in Fig 14 is capable of concurrently generating and measuring audio frequency signals The 14AA Actuator Supply receives a swept tone generated by the computer and sends this superimposed on a polarisation voltage of 200VDC to the coupler mounted in the jig also shown in Fig 14 The coupler picks up the resulting audio signal and sends this back to the com puter which traces out and dis...

Page 17: ...ept tones and signal analysis To analyser from Preamplifier From signal generator 14AA Actuator Supply To RA0045 RA0045 Ear Simulator set up for calibration see Figs 6 and 7 Fig 14 Block diagram of a complete set up for calibration Fig 15 Example of a calibration result using a swept tone 17 LI0070 28 June 2017 ...

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