GRAS 43AG Ear and Cheek Simulator Instruction Manual

An Axiometrix Solutions Brand
Instruction Manual
GRAS 43AG Ear and Cheek Simulator
LI0189 – 1 June 2022

43AG Ear and Cheek Simulator

Revision History
Any feedback or questions about this document are welcome at [email protected].

corrected
3| 29-Aug-16| Additions to section about Assembly
4| 9-Sep-16| Addition about assembly of 43AG-5
5| 16-Nov-16| Use only right pinnae, left pinnae are not flush with cheek plate
6| 14-Mar-17| Caution about use of force with angled adapter
7| 19-Dec-17| Configurations with High-Frequency Ear Simulator added
8| 20-Aug-19| Configurations with Hi-Res Ear Simulator added
9| 2-Sep-20| Correction values for calibration at 1 kHz added
10| 1-Jun-22| TEDS compliance section added

This manual covers the configurations 43AG-1 to 43AG-9. If you are the owner of a 43AG delivered before April 2016, the Manual for non-configured 43AG (LI0022) is the correct manual. This manual can be downloaded from the 43AG product page at www.GRASacoustics.com.
Copyright Notice
© 2016-22 GRAS Sound & Vibration http://www.GRASacoustics.com
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 is not liable or responsible for any errors or inaccuracies that may appear in this document.
Trademarks
Product names mentioned in this document may be trademarks or registered trademarks of their respective companies and are hereby acknowledged.

Introduction

The GRAS 43AG Ear and Cheek Simulator is a unique multi-purpose tool that helps you accomplish the job in an effective and efficient manner. We call it the table-top KEMAR as it offers you much of the KEMAR capability in a convenient and portable packaging.
Our vision for the 43AG is to assist you in all facets of the product development cycle: from R&D to EOL testing.
The 43AG is a multi-purpose tool that can be used for testing of both concha and insert types earphones. It can also be used for headphone testing, both circum-aural and supra-aural types.
Also, all common types of hearing-aids, and telephone handset can be tested with the 43AG. To make ordering and decision making easier, we have made 43AG available in 7 configurations, fully calibrated and containing all configuration specific parts:

• 43AG-1 Ear and Cheek Simulator LEMO
• 43AG-2 Ear and Cheek Simulator CCP
• 43AG-3 Ear and Cheek Simulator w Anthropometric Pinna LEMO
• 43AG-4 Ear and Cheek Simulator w Anthropometric Pinna CCP
• 43AG-5 Ear and Cheek Simulator, Low-noise
• 43AG-6 Ear and Cheek Simulator, High-Frequency, LEMO, w Anthropometric Pinna
• 43AG-7 Ear and Cheek Simulator, High-Frequency, CCP w Anthropometric Pinna
• 43AG-8 Ear and Cheek Simulator, Hi-Res LEMO w Anthropometric Pinna
• 43AG-9 Ear and Cheek Simulator, Hi-Res CCP w Anthropometric Pinna
• With these configurations, tests can be performed according to the following standards:
• IEC 60318-4 (former IEC 60711)
• ITU-T Rec. P.57 Type 2 Artificial Ear
• ITU-T Rec. P.57 Type 3.3 Pinna Simulator

TEDS Compatibility
Ear and cheek simulators with constant-current power (CCP)microphone components (configurations -2, -4, -7, and -9, and specific custom CCP configurations, including -S1, -S3, and -S4) are IEEE 1451.4 TEDS v. 1.0 compliant. If your measurement platform supports Transducer Electronic Data Sheets (TEDS), you will be able to read and write data like properties and calibration data.
The Scope of this Manual
This manual covers the configurations 43AG-1 to 43AG-9. If you are the owner of a 43AG delivered before April 2016, the Manual for non-configured 43AG (LI0022) is the correct manual.
This manual can be downloaded from the  43AG product page at www.GRASacoustics.com

Delivered Items

43AG-1 Ear and Cheek Simulator LEMO

43AG-1

| Test Jig with mounting base and adjustable force clamp| RA0052
Cheek Plate| RA0314
| Large Right Pinna 55 Shore OO| KB0065
| Ear Canal Extension| GR0917
|

Externally Polarized Ear Simulator According to IEC 60318-4

|

RA0045

| Angled ½² to ¼² Adapter|

RA0001

| ¼² Preamplifier with 3 m integrated cable|

26AC

| Finger Simulator| RA0199
| External Ear Canal| GR0408
| Union Nut| GR0409

43AG-2 Ear and Cheek Simulator CCP

43AG-2

| Test Jig with mounting base and adjustable force clamp| RA0052
Cheek Plate| RA0314
| Large Right Pinna 55 Shore 00| KB0065
| Ear Canal Extension| GR0917
| Pre-polarized Ear Simulator According to IEC 60318-4| RA0045-51
| Angled W to 1/4″ Adapter| RA0001
| 1/4″ Preamplifier| 26CB
| Microdot to BNC Cable, 3 m| AA0070
| Finger Simulator| RA0199
| External Ear Canal| GRO408
| Union Nut| GR0409

43AG-3 Ear and Cheek Simulator w. Anthropometric Pinna LEMO

43AG-3

| Test Jig with mounting base and adjustable force clamp| RA0052
Cheek Plate| RA0314
| Large Right Anthropometric Pinna 35 Shore 00| KB5000
| Ear Simulator Holder| GR1874
–| Finger Screws for pinna| 2 x SK6012
| Externally Polarized Ear Simulator According to IEC 60318-4| RA0045
| Angled 1/2″ to 1/4″ Adapter| RA0001
| ‘A” Preamplifier with 3 m integrated cable| 26AC
| Finger Simulator| RA0199
| External Ear Canal| GR0408
| Union Nut| GR0409

43AG-4 Ear and Cheek Simulator w. Anthropometric Pinna CCP

43AG-4

| Test Jig with mounting base and adjustable force clamp| RA0052
Cheek Plate| RA0314
| Large Right Anthropometric Pinna 35 Shore OO| KB5000
| Ear Simulator Holder| GR1874
–| Finger Screws for pinna| 2 x SK6012
| Prepolarized Ear Simulator According to IEC 60318-4| RA0045-S1
| Angled ½² to ¼² Adapter| RA0001
| ¼² Preamplifier with Microdot Connector| 26CB
| Microdot to BNC able, 3 m| AA0070
| Finger Simulator| RA0199
| External Ear Canal| GR0408
| Union Nut| GR0409

43AG-5 Ear and Cheek Simulator, Low-noise

43AG-5

| Test Jig with mounting base and adjustable force clamp| RA0052
Cheek Plate| RA0314
| Large Right Anthropometric Pinna 35 Shore OO| KB5000
| Ear Simulator Holder| GR1874

–

| Finger Screws for pinna| 2 x SK6012
| Finger Simulator| RA0199
| External Ear Canal| GR0408
| Union Nut| GR0409
Low-noise Ear Simulator System| 43BB
| | Low-noise Ear Simulator|
| Angled ½² to ¼² Adapter| RA0001
| ¼² Preamplifier with 3 m integrated cable|
| Filter and Gain Unit|
| LEMO 7-pin to 7-pin, 1 m cable| AA0059
| Power Module for low-noise systems| 12HF

43AG-6 Ear and Cheek Simulator w. High-Frequency Ear Simulator LEMO

43AG-6

| Test Jig with mounting base and adjustable force clamp| RA0052
Cheek Plate| RA0314
| Large Right Anthropometric Pinna 35 Shore OO| KB5000
| Ear Simulator Holder| GR1874

–

| Finger Screws for pinna| 2 x SK6012
| Externally polarized High-Frequency Ear Simulator| RA0401
| Angled ½² to ¼² Adapter| RA0001
| ¼² Preamplifier with 3 m integrated cable| 26AC
| Finger Simulator| RA0199
| External Ear Canal| GR0408
| Union Nut| GR0409

43AG-7 Ear and Cheek Simulator w. High-Frequency Ear Simulator CCP

43AG-7

| Test Jig with mounting base and adjustable force clamp|

RA0052

Cheek Plate|

RA0314

| Large Right Anthropometric Pinna 35 Shore OO| KB5000
| Ear Simulator Holder| GR1874

–

| Finger Screws for pinna| 2 x SK6012
| Prepolarized High-Frequency Ear Simulator| RA0402
| Angled ½² to ¼² Adapter| RA0001
| ¼² Preamplifier with Microdot Connector| 26CB
| Microdot to BNC able, 3 m| AA0070
| Finger Simulator| RA0199
| External Ear Canal| GR0408
| Union Nut| GR0409

43AG-8 Ear and Cheek Simulator w. Hi-Res Ear Simulator LEMO

43AG-8

| Test Jig with mounting base and adjustable force clamp| RA0052
Cheek Plate| RA0314
| Large Right Anthropometric Pinna 35 Shore 00| KB5000
| Ear Simulator Holder| GR1874
–| Finger Screws for pinna| 2 x SK6012
| Externally polarized Hi-Res Ear Simulator| RA0403
| Angled 1/2″ to 1/4″ Adapter| RA0001
| 1/4″ Preamplifier with 3 m integrated cable| 26AC
| Finger Simulator| RA0199
| External Ear Canal| GRO408
| Union Nut| GR0409

43AG-9 Ear and Cheek Simulator w. Hi-Res Ear Simulator CCP

43AG-9

| Test Jig with mounting base and adjustable force clamp| RA0052
Cheek Plate| RA0314
| Large Right Anthropometric Pi nna 35 Shore 00| KB5000
| Ear Simulator Holder| GR1874
–| Finger Screws for pinna| 2 x SK6012
| Prepolarized Hi-Res Ear Simulator| RA0404
| Angled 1/2″ to IA” Adapter| RA0001
| 1/4″ Preamplifier with Microdot Connector| 26C8
| Microdot to BNC able. 3 m| AA0070
| Finger Simulator| RA0199
| External Ear Canal| GR0408
| Union Nut| GR0409

Assembly

Before Assembly – All Versions
The cheek plate is attached to the test jig with a snap fit mechanism that locks onto the flange on the GR0917 Ear Canal Extension or the GR1874 Ear Simulator Holder, as shown in Fig. 1.When mounted, the cheek plate is held in place by the four spring-loaded balls and the holder flange Fig. 1. The snap fit mechanism explained. Here shown with the GR1874 Ear Simulator Holder.
As delivered, the GR0408 External Ear Canal is mounted on the ear simulator. It is only needed for calibration and must be dismounted to make place for the GR0917 Ear Canal Extension or the GR1874 Ear Simulator Holder.Ear simulatorwith GR0408

External Ear Canal Unscrew the GR0409 Union Nut to remove the External Ear Canal Fig. 2. The GR0408 External Ear Canal must be removed from the ear simulator prior to mounting.
43AG-1 to 43AG-4 and 43AG-6 to 43AG-9
The preamplifier and the angled adapter are already mounted in the jig. To mount the other parts, proceed as follows:

1. Screw the GR0917 Ear Canal Extension (43AG-1 and 43AG-2) or the GR1874 Ear Simulator Holder (43AG-3 and 43AG-4) onto the ear simulator.
2. Screw the ear simulator into the test jig (onto the angled adapter already mounted by GRAS).
   Use only finger force when tightening.
   See Fig. 3 on page 15.
   GR0917 Ear Canal Extension or GR1874 Ear Simulator Holder
   Ear Simulator Ear simulator(with holder or ear canal extension)
   Test Jig Fig. 3. Mounting the ear simulator in the test jig.*Two pins are provided, a short and a long one. The short pin is 40 mm, the long is 75 mm.

43AG-5
The 43AG-5 comes with preamplifier, angled adapter and ear simulator already installed. These three parts are glued together and calibrated as a complete unit.
Important. They must not be disassembled as this will jeopardize the calibration and their lownoise performance.
The low-noise ear simulator is mounted a little higher in the Test Jig because the preamplifier is bigger (See Fig. 4). However, the ear simulators used in the 43AG configurations are mounted the same way – screwed onto the RA0001 Angled Adapter – and therefore the mechanical stability is the same. The GR0408 External Ear Canal must be replaced with the Ear Simulator Holder. See Fig. 2 and Fig. 3.1. It is not glued and can freely be removed.

Reassembling the Ear Simulator and Preamplifier
If you have removed the angled adapter and preamplifier from the ear simulator, you need to use only gentle finger force when attaching the angled adapter to the ear simulator.
Caution! Do NOT use the preamplifier as a lever to tighten the angled adapter onto the ear simulator. If you do, there is a real risk that the angled adapter will be attached so tightly to the microphone in the ear simulator that it cannot be removed again without also (unintentionally) removing the microphone. Fig. 5. Mounting the angled adapter – use only gentle finger force.Mounting the angled adapter – use only gentle finger force.

Adjusting Clamp Height and Force

Adjusting the Clamp Height
The distance of the spring-loaded clamp to the cheek plate can be adjusted continuously from 25 mm to 90 mm. Two pin lengths are supplied, one 40 mm and another 75 mm long. A distance between 25 to 55 mm can be achieved using the short pin, a distance of 55 mm to 90 mm can be achieved using the long pin.
In Fig. 6A the clamp is at its lowest position on the short pin.
In Fig. 6B the clamp is in its uppermost position on the short pin or its lowest position on the long pin.
In Fig. 6C the clamp is in its uppermost position on the long pin. Fig. 6. Adjusting the spring-loaded clamp’s distance to the cheek plate.
In the examples shown above, the flat arm holding the pin and the spring adjusted clamp is attached to the cheek plate.
If you use the flat arm attached to the test jig, you must use the long pin and can achieve a distance from 25 to 55 mm.

Adjusting the Spring Tension and Measuring its Force
The force applied to the device under test is determined by springs on the side of the clamp-arm assembly. The assembly can accommodate two or four springs. Furthermore, the force can be adjusted by adjusting the preload to the springs. Turning the knurled knob counter-clockwise will pull the spring holder downwards, thus increasing the preload to the spring. Alternatively, turning the knurled knob clockwise will allow the holder to move upwards and decrease the tension. Fig. 7. Adjusting the preload of the springs.
The tension that can be achieved largely depends on the condition of the springs, and can vary depending on previous use and it is therefore not possible to give precise figures. Broadly speaking, a tension of about 1 N to 8 N can be achieved with one set of springs. With four springs about 6 to 12 N can be achieved. Standard tension for most applications is 5N. With the RA0184 Force Gauge you can determine the actual force applied to the DUT as shown in Fig. 8.
The clamp can easily be removed with a small Phillips screwdriver and replaced with an RA0199 Finger Simulator, as shown in Fig. 9.

Mounting the KEMAR Pinnae

When mounting a pinna, ensure that the posterior part of the helix is positioned towards the arm.
A standardized pinna as used with the 43AG-1 and 43AG-2 is mounted by simply pushing it into the recess. Ensure that the pinna is flush with the cheek plate.
The anthropometric pinna used with 43AG-3 to 43AG-7 is mounted in the same way, but in addition to the push mounting, they must be secured by the two finger screws mounted from the underside of the cheek plate, as shown in Fig. 10 below. To mount these screws, you must first remove the cheek plate assembly, see Fig. 4.
Important. To ensure that the base of the pinna is flush with the cheek plate, only right pinnae should be used. KEMAR is not symmetrical, and the base of a left KEMAR pinna will not be flush with the cheek plate.

1. Remove the cheek plate from the test jig by pulling it up until released by the snap fit mechanism. This is the opposite of step 3 on page 12. See also Fig. 4.
2. Push the ear down over the studs.
3. Mount the two finger screws from the underside and tighten, using finger force only.
4. Remount the cheek plate by pushing it down onto the jig until it is held in place by the snap fit mechanism as shown in Fig. 4 on page 15.

Test Setups
A typical test setup for the externally polarized versions 43AG-1, 43AG-3 and 43AG-6 is shown in Fig. 11. For the prepolarized versions 43AG-2,43AG-4 and 43AG-7, the 12AQ 2-Channel Universal Power Module with signal conditioning and PC interface can be used.The G.R.A.S 12AU 1-Channel Universal Power Module with signal conditioning and power amplifier has a built-in power amplifier, and therefore it can be substituted for both the 12AK Power module and the separate power amplifier shown above.
A typical test setup for 43AG-5 is shown in Fig. 12. The 26HT Gain Unit and 12HF Power Module are part of the delivery and cannot be replaced by other equipment. Fig. 12. Test setup for 43AG-5 with 26HT Gain Unit and the 12HF Power Module.

Calibration

Do not attempt to remove the microphone from the Ear Simulator – you must calibrate the ear
simulator as a complete unit. The instructions below assume that the 43AG is connected to power
module and analyzer.
43AG-1 and 43AG-2
43AG-1 and 43AG-2 can be calibrated in situ using an RA0157 Calibration Adapter. This is described in Method 1 below.
Alternatively, you can remove pinna and cheek plate and calibrate the RA0045 with the external ear canal mounted.
The two methods are equally accurate.
Method 1 – In-situ Calibration with RA0157 Calibration Adapter

1. Remove the pinna from the cheek plate.
2. Unscrew the collar of the Pistonphone and remove the O-ring.
3. Mount the RA0157 Calibration Adapter into the pistonphone.
4. Position the pistonphone strictly vertically over the RA0045.

Refer to your Pistonphone’s manual for further information, including how to correct for barometric pressure. The correction factor is: -0.62 dB.
Ideally your analyzer should read 114 dB – 0.62 dB = 113.38 dB ± correction for ambient pressure.
Method 2 – The Cheek Plate Removed and GR0408 Exterior Ear Canal is Used The pistonphone should be fitted with a ½ inch coupler.

1. Remove the cheek plate by pulling it upwards until it is released by the snap-fit mechanism.
2. Unscrew the mounting flange from the ear simulator.
3. Using the GR0409 Union Nut, mount the GR0408 Exterior Ear Canal on the Ear Simulator.
4. Unscrew the collar of the Pistonphone and remove the O-ring.
5. Position the Pistonphone strictly vertically over the RA0045 and push it down gently till it can go no further.

Refer to your Pistonphone’s manual for further information, including how to correct for barometric pressure.
The correction factor is -1.03 dB. Ideally your analyzer should read 114 dB – 1.03 dB = 112.97 dB ± correction for ambient pressure.
43AG-1 to 43AG-9
43AG-3 and AG-4 w. Anthropometric Pinna
43AG-6 and AG-7 w. High-Frequency Ear Simulator and Anthro. Pinna
43AG-8 and AG-9 w. Hi-Res Ear Simulator and Anthro. Pinna
The instructions below assume that 43AG-3/43AG-4 is connected to power module and analyzer.
Calibration of a 43AG fitted with an anthropometric pinna can only be done when the pinna and the cheek plate have been removed from the ear simulator (mounted in the test jig).
As the anthropometric pinna does not use an ear canal extension, the GR0408 External Ear Canal must be fitted on the ear simulator for the calibration.
The steps required are shown on Fig. 2 on page 14, but should be reversed. However, do not remove the ear simulator from the test jig.

1. Remove the Cheek Plate by pulling it upwards until released by the snap-fit mechanism (reverse of Fig. 4, 3).
2. Unscrew the Ear Simulator Holder from the Ear Simulator (reverse of Fig. 3, 1).
3. Using the GR0409 Union Nut, mount the GR0408 Exterior Ear Canal on the Ear Simulator.
4. Position the Pistonphone strictly vertically over the External Ear Canal.

Refer to your Pistonphone’s manual for further information, including how to correct for barometric pressure. The correction factor is – 1.03 dB. Ideally your analyzer should read 114 dB – 1.03 dB = 112.97 dB ± correction for ambient pressure.

43AG-5 Low-noise
The instructions below assume that 43AG-5 is connected to power module, filter and gain unit and analyzer.
System Sensitivity
Since the microphone signal is amplified by 20 dB by the 26HT Gain and Filter Unit, the nominal system sensitivity corresponds to 0.8 V/Pa. When the output voltage from the Power Module is 0.8 V RMS, the microphone is subjected to 94 dB re. 20 μPa. The  actual system sensitivity is quoted on the calibration chart supplied with the system.
Calibration
To avoid overload, the 42AG Multifunction Sound Calibrator is recomended as it can produce a calibration signal of 94dB.

1. Remove the cheek plate by pulling it upwards until released by the snap-fit mechanism, see Fig. 4 on page 15.

2. Replace the Ear Simulator Holder with the External Ear Canal see Fig. 13.

3. Push fit the ½″ coupler onto the 1″ coupler of the 42AG. The ½″ is a spare part delivered with the 42AG.

4. Set the 42AG to 250Hz, 94 dB.

5. With the ear simulator still mounted in the test jig, mount the 42AG onto the ear simulator so the ear simulator fits into the ½″ coupler.
   Do NOT remove the Ear Simulator from the test jig. Doing this will compromise its low-noise performance.

6. Adjust the analyzer to indicate 94 dB re. 20 μPa. Adjust this value by a further –0.09 dB to account for the additional ear simulator volume.
   Refer to your 42AG manual for further information.

Correction Factors

The correction factors for the various calibration options are listed below. The correction factors are needed because the different calibration options introduce varying effective volumes.
The correction factors have nothing to do with the different pinnae used.

43AG-1 to -4 and 43AG-6 to -9 with Standard Ear Simulator (RA0045-series and RA040X-series)

In-situ calibration, without dismantling
| Accessories| Correction factor
42AP and 42AA| RA0157| -0.62 dB
The cheek plate removed
42AP and 42AA| GR0408| -1.03 dB
42AG @250 Hz, 114 dB| GR0408| -0.09 dB
42AG @250 Hz, 94 dB| GR0408| -0.09 dB
42AG @1KHz, 114 dB| GR0408| -0.2 dB
42AG @1KHz, 114 dB| GR0408| -0.2 dB
43AG-5 with Low-noise Ear Simulator
42AP and 42AA| GR0408| -0.7 dB
42AG @250 Hz, 94 dB| GR0408| -0.09 dB
42AG @1KHz, 94 dB| GR0408| -0.2 dB*

• Se the following section Calibration at 1 kHz.
  Calibration at 1 kHz
  At 1 kHz, the frequency response changes from unit to unit. The actual value for the specific ear simulator is stated on the calibration chart and must be added to the correction. For example:
  If the response of the specific ear simulator at 1 kHz is + 1.45 dB (re 500 Hz), the final correction value will be -0.2 + 1.45 = 1.25 dB. GRAS recommends calibrating at 250 Hz whenever possible.

Technical Specifications

43AG Ear and Cheek Simulator

43AG Dimensions Pinna Base and Ear Canal Extension Dimensions RA0045 Ear Simulator (43AG-1 to 43AG-4)

Standards

IEC 60318-4| Occluded-ear simulators for the measurement of earphones coupled to the ear by ear inserts
---|---
ITU-T Recommendation P.57| Series P: Telephone transmission quality, Objective measuring apparatus: Artificial ears
ANSI S3.25/ASA-2009| American National Standard For an Occluded Ear Simulator

Frequency Response
Typical transfer impedance re 500 Hz

Sensitivity
Sensitivity| 12.5 mV/Pa
Dynamic Range|
RA0045 ( LEMO )| 25 dBA to 164 dB
RA0045-S1 ( CCP)| 25 dBA to 153 dB
Effective Volume
at 500 Hz| 1260 mm3
Dimensions
Height| 23.0 mm
Diameter| 23.75 mm

43BB Low-noise Ear Simulator System (43AG-5)

Frequency Response

Typical frequency response re 500 Hz Typical frequency response (dark blue) versus the IEC tolerances (dashed grey) and the ideal IEC 60318-4 frequency response (light blue)|
Noise floor
The noise floor (solid curve) is typically below the threshold of human hearing (dashed curve)|
Sensitivity
Sensitivity| 800 mV/pa
Dynamic Range|
RA0234| 10.5 dBA to 113 dB
Effective Volume
at 500 Hz| 1260 mm3
Dimensions
Height| 23.0 mm
Diameter| 23.75 mm

RA0401/0402 High-Frequency Ear Simulator (43AG-6 and 43AG-7)

Standards

IEC 60318-4| Occluded-ear simulators for the measurement of earphones coupled to the ear by ear inserts
ITU-T Recommendation P.57| Series P: Telephone transmission quality, Objective measuring apparatus: Artificial ears
ANSI S3.25/ASA-2009| American National Standard For an Occluded Ear Simulator
Frequency Response
Typical transfer impedancere 500 Hz|
Resonance frequency| 13.5 kHz ± 1 kHz (at reference point)
Sensitivity
Sensitivity| 12.5 mV/Pa
Dynamic Range|
RA0401 (LEMO)| 25 dBA to 164 dB
RA0402 (CCP)| 25 dBA to 153 dB
Effective Volume
at 500 Hz| 1260 mm3
Dimensions
Height| 23.0 mm
Diameter| 23.75 mm

RA0401/0402 High-Frequency Ear Simulator (43AG-6 and 43AG-7)

Standards

IEC 60318-4| Occluded-ear simulators for the measurement of earphones coupled to the ear by ear inserts
ITU-T Recommendation P.57| Series P: Telephone transmission quality, Objective measuring apparatus: Artificial ears
ANSI S3.25/ASA-2009| American National Standard For an Occluded Ear Simulator
Frequency Response
Typical transfer impedancere 500 Hz|
Resonance frequency| 13.5 kHz ± 1 kHz (at reference point)
Sensitivity
Sensitivity| 1.6 mV/Pa
Dynamic Range|
RA0403 (LEMO)| 44 dBA to 169 dB
RA0404 (CCP)| 46 dBA to 166 dB
Effective Volume
at 500 Hz| 1260 mm3
Dimensions
Height| 23.0 mm
Diameter| 23.75 mm

Accessories

Pinnae

Hardness 55 Shore OO (hard)
Small Right Pinna| KB0060
Large Right Pinna (included with 43AG-1 and -2)| KB0065
Large Right Pinna (VA style)| KB0090
Hardness 35 Shore OO (soft)
Small Right Pinna| KB1060
Large Right Pinna| KB1065
Large Right Pinna (VA style)| KB1090
Large Right Anthropometric Pinna (included with 43AG-3-7)| KB5000
Power Modules

2-Channel Universal Power Module with signal conditioning and PC interface| 12AQ
1-Channel Power Module with gain, filters and SysCheck generator| 12AK
1-Channel Universal Power Module with signal conditioning and power amplifier| 12AU
Calibration Equipment

Intelligent Pistonphone Class 0| 42AP
Pistonphone Class 1| 42AA
½² Calibration Adapter for KEMAR pinnae| RA0157
94 dB Pistonphone Coupler| RA0090
Force Gauge| RA0184
LEMO Cables

3 m LEMO 7-pin – LEMO 7-pin Cable| AA0008
10 m LEMO 7-pin – LEMO 7-pin Cable| AA0009
Customized length LEMO 7-pin – LEMO 7-pin Cable (Specify length in cm)| AA0020-CL
CCP Cables

3 m Microdot – BNC Cable| AA0070
Cables for 43BB Low-noise Ear-simulator System

3 m LEMO 7-pin – LEMO 7-pin Cable for Low-noise measuring systems| AA0046
10 m LEMO 7-pin – LEMO 7-pin Cable for Low-noise measuring systems| AA0047
Customized length LEMO 7-pin – LEMO 7-pin Cable for Low-noise measuring systems. CLXXXX= Cable length in centimeters to be specified by customer| AA0053-CL

Warranty, Service and Repair

Calibration
Before leaving the factory, all GRAS products are calibrated in a controlled laboratory environment using traceable calibration equipment.
We recommend a yearly recalibration at minimum, depending on the use, measurement environment, and internal quality control programs.
We recommend calibration prior to each use to ensure the accuracy of your measurements.
Warranty
Damaged diaphragms in microphones can be replaced. The microphone diaphragm, body, and improved protection grid are made of high-grade stainless steel, which makes the microphone resistant to physical damage, as well as corrosion caused by aggressive  air or gasses. This, combined with the reinforced gold- plated microphone terminal which guarantees a highly reliable connection,enables GRAS to offer 5 years warranty against 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 GRAS International Support Center located in Denmark. Our Support Center is equipped with the newest test equipment and staffed with dedicated and highly skilled engineers. Upon request, we make cost estimates based on fixed repair categories. If a product covered by warranty is sent for service, it is repaired free of charge, unless the damage is the result of negligent use or other violations of the warranty. All repairs are delivered with a service report, as well as an updated calibration chart.

Manufactured to conform with:
CE marking directive:
93/68/EEC
WEEE directive:
2002/96/EC
RoHS directive:
2002/95/EC GRAS Sound & Vibration continually strives to improve the quality of our products for our customers;
therefore, the specifications and accessories are subject to change.
GRAS 43AG Ear and Cheek Simulator

References

• GRAS Sound and Vibration

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