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Summary of Contents for Audio Precision AECM206
- Page 1 AECM206 headphone test fixture User’s Guide and Specifications model AECM206 November, 2017...
- Page 2 Audio Precision, AP, and APx are trademarks of Audio Precision, Inc. Windows™ is a trademark of Microsoft Cor- poration. Dolby and the double-D symbol are trademarks of Dolby Laboratories, Inc.
- Page 3 Audio Precision APx5 Series for signal measurement and analysis. ap.com Visit the Audio Precision web site at ap.com for APx support information and APx resources. You can also contact our Technical Support staff at techsupport@ap.com, or by telephoning 503-627-0832 ext. 4, or 800-231-7350 ext. 4 (toll free in the U.S.A.).
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Page 5: Table Of Contents
Local Calibration ............. 7 AECM206 Headphone Test Fixture: Table of Contents... - Page 6 Specifications ............. 15 AECM206 Headphone Test Fixture: Table of Contents...
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Page 7: User Guide
User’s Guide Overview The AECM206 is a well-isolated headphone test fixture that supports standards-compliant headphone, earphone, earbud and hearing protection (ear muff) testing. Symmetrical, anatomical pinnae are provided in two hard- nesses, accommodating circum-aural, supra-aural, intra- concha, and insert earphone testing. -
Page 8: What's In The Box
User’s Guide What’s in the box? The AECM206 is delivered surrounded by protective contoured foam, shipped in either a cardboard carton or an optional hard travel case. The fixture is fully assembled and ready for immediate use. Cases for Tools and... -
Page 9: Inspection And Preparation
Be sure to carefully coil the cables, and to encircle the test stud Face fixture with the sling when replacing it into the foam cutout. To carry the AECM206, support both the neck and head simultaneously. Collar Neck cavity Components... - Page 10 User’s Guide Figure 5. 2.5 mm, 2 mm and 1.5 mm hex drivers; silicon Figure 3. AECM206-RING alignment ring plate and screws. grease. Two such rings are mounted on the AECM206. Figure 6. An AECM304, shown here fitted with an ear canal extension to the left in the photograph, and mated to an 426M15 preamplifier, shown to the right.
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Page 11: Pinnae Part Numbers
See Figure 7. Do not interchange these components. For orientation purposes, the face of the test fixture head is associated with the Audio Precision logo. Therefore, when For use with the fixture is set with the logo facing you, the left pinna and... -
Page 12: Attaching The Pinnae
Factory Calibration hardness. They are provided as a harder alternative, com- We recommend that the AECM206 be returned to the fac- pressing to a lesser extent when using supra-aural or other tory for calibration and certification as part of a regular ser- compressing headphones. -
Page 13: Local Calibration
The CAL250 calibrator’s acoustic output is 114 dBSPL Extension fitted to each AECM304. (10 Pa) at 251.2 Hz. Note: if the CAL250 has an ADP019 adapter already fitted, the ADP019 must be removed before attaching the ADP105. AECM206 Headphone Test Fixture: User’s Guide... - Page 14 User’s Guide Figure 12. Pressing down to release gasket seal. Figure 11. CAL250 attached to the AECM206 Push the button on the calibrator to turn it on. The CAL250 will run for 60 seconds, which provides sufficient time for you to measure and set the calibration level in your ana- lyzer.
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Page 15: Test Use Case
User’s Guide Test Use Case Figure 14 shows a block diagram of a basic headphone test, using the AECM206 Headphone Test Fixture, an Audio Precision analyzer and the Audio Precision APx1701 Transducer Test Interface. This figure is representative: a different audio analyzer could be used, and the functions of the APx1701 could be replaced by an audio power amplifier and a two-channel ICP®... -
Page 16: Service
User’s Guide Service The AECM206-RING alignment ring plate is attached to the fixture by four 2.5 mm screws. It is easily removed by The AECM206 Headphone Test Fixture does not require removing the screws using the provided 2 mm hex wrench. -
Page 17: Removing The Preamplifier/Microphone System For Shipping
Figure 19. Protective rubber boot on preamplifier threads acoustic isolation material. Separating the preamplifier from the ear simulator Once the clamp has been loosened (Figure 16) and the AECM304/426M15 assembly has been pulled out of the AECM206 Headphone Test Fixture: User’s Guide... -
Page 18: Removing The Head From The Neck
If there is not enough slack in the cables to allow you to set the head next to the stand, lay the stand on its side until you can release the cables. Figure 21. Separating the head from the neck. AECM206 Headphone Test Fixture: User’s Guide... - Page 19 426M15 down through the Figure 23. Slip the cables through the slot in the gasket and head and neck collar and remove it. then pull the cables up through the opening in the neck. AECM206 Headphone Test Fixture: User’s Guide...
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Page 20: Reinstalling The Preamplifier/Microphone System And Cable
Figure 26. The length of cable between the gasket and neck insert should be approximately 6 inches. Figure 24. Removing the neck washer and gasket. AECM206 Headphone Test Fixture: User’s Guide... -
Page 21: Specifications
20 ounce inches to provide an optimal seal. While turning the screw, squeeze the slit of the gasket together as shown in Figure 27. The slit in the gasket should be fully closed. AECM206 Headphone Test Fixture: User’s Guide... - Page 22 See Figure 31. Figure 29. Applying silicon grease to the neck gasket (2). Figure 28. Applying silicon grease to the neck gasket (1). Figure 30. Feeding cable slack into the head cavity. AECM206 Headphone Test Fixture: User’s Guide...
- Page 23 User’s Guide Figure 31. Tightening the ear simulator clamp set screws. AECM206 Headphone Test Fixture: User’s Guide...
- Page 24 User’s Guide AECM206 Headphone Test Fixture: User’s Guide...
- Page 25 Size (height x width): 37.8 cm x 20 cm (7.9 in x 14.9 in). ITU-T P.57 Type 3.3 compliant pinnae simulator See Figure 32, Dimensions. (AEC-LOO35 & AEC-ROO35) Cable Length: 5 ft (1.5 m) Electrical Connector: BNC AECM206 Headphone Test Fixture: Specifications...
- Page 26 Temperature Range (Storage): –40 to 85 °C (–40 to Options 185 °F) CAL250 Class 1 acoustic calibrator with 1 inch opening and output of 114 dB re 20 µPa at 251.2 Hz. Temperature Response: <0.03 dB AECM206 Headphone Test Fixture: Specifications...
- Page 27 Size (Diameter x Length): 12.7 mm x 35.7 mm (0.5 in x 1.4 in) Weight: 3.6 gm (0.13 oz) Figure 33. Electrical Connector: BNC Plug Cable Length: 1.5 m (5 ft) Mounting Thread (Microphone to Preamplifier): 11.7 mm - 60 UNS AECM206 Headphone Test Fixture: Specifications...
- Page 28 Transfer Functions assumed that a head and torso would be present rather than the actual geometry of the AECM206. The following trans- The AECM206 is designed for headphone and earbud test- fer functions are in accordance with ANSI S3.36 (2012).
- Page 29 Specifications Free Field Response Figure 34. AECM206 Headphone Test Fixture: Specifications...
- Page 30 ±1 1600 ±1.5 ±1 2000 11.3 ±2 ±1 2500 14.4 ±3 ±1.3 3150 14.8 ±3 ±1.3 4000 13.4 ±3 ±1.5 5000 11.1 ±3 ±1.5 6300 ±4 ±1.5 8000 10.0 ±5 ±1.5 10000 ±6 1000 ±1.5 AECM206 Headphone Test Fixture: Specifications...
- Page 31 Specifications Diffuse Field Response Figure 35. AECM206 Headphone Test Fixture: Specifications...
- Page 32 -0.2 1320 -2.8 6000 -2.5 -0.2 1400 -3.2 6300 -2.9 -0.2 1500 -3.6 6700 -4.0 -0.3 1600 -4.2 7100 -5.3 -0.4 1700 -4.7 7500 -7.5 -0.4 1800 -5.2 8000 -12.2 -0.5 1900 -5.8 8500 -18.6 AECM206 Headphone Test Fixture: Specifications...
- Page 33 Specifications DRP to ERP Transfer Function Figure 36. AECM206 Headphone Test Fixture: Specifications...
- Page 34 Specifications AECM206 Headphone Test Fixture: Specifications...
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