AEC206
Binaural Test Fixture
Page 1: ...AEC206 Binaural Test Fixture...
Page 2: ...Larson Davis AEC206 Binaural Test Fixture Reference Manual...
Page 3: ...for inclusion in new editions Changes and improvements to the information described in this manual may be made at any time Record of Serial Number and Purchase Date AEC206 Serial Number ___________ 42...
Page 4: ...1 4 Performing Calibration 1 6 Module 2 Assembly 2 1 2 1 Overview 2 1 2 2 Mounting Artificial Pinnae 2 2 2 3 Ear Simulator and Preamplifier 2 3 2 4 Storage 2 12 Appendix A Technical Specifications A...
Page 5: ...aural and circum aural as well as hearing protection devices In the head of the fixture are two 426M11 preamplifiers with AEC304 occluded ear simulators It is stabilized and mounted on a steel circul...
Page 6: ...04 IEC 60318 4 Occluded Ear Simulator AEC206 RING Alignment Ring with screws SAE206 01 AEC206 Binaural Test Fixture with nylon sling ADP105 adapter for a CAL250 calibrator Pinnae AEC L0035 Left Pinna...
Page 7: ...other Larson Davis sound measurement equipment It has a full 114 0 dB level output signal at 251 2 Hz AEC206 CUP Isolation test copper cup with foam insert used for isolation testing to confirm compl...
Page 8: ...AEC206 Reference Manual Connecting to Analyzer 1 4 1 3 Connecting to Analyzer A basic headphone test can be made with the following mechanical setup FIGURE 1 4 Basic Headphone Configuration...
Page 9: ...AEC206 Reference Manual Connecting to Analyzer 1 5 FIGURE 1 5 Headphone Test with Impedance T S...
Page 10: ...4 Acoustic Calibration A technician performs a manual acoustic calibration at the beginning and end of the day or test to ensure the test was performed accurately The following procedures describe an...
Page 11: ...nce Manual Performing Calibration 1 7 until the connection is loose otherwise you may break the ADP105 or pull the AEC304 out of the head FIGURE 1 7 Remove Calibrator Step 7 Repeat calibration on the...
Page 12: ...onally you can find assembly instruction videos online see https www youtube com user LarsonDavisPCB 2 1 1 Left and Right Identification TAKE NOTE The preamplifier cables are marked with blue or red t...
Page 13: ...into the space with your finger until the edges are flush under the plate To mount the artificial pinnae follow these steps Step 1 Align the bottom notch on the back of the pinna with the alignment sc...
Page 14: ...of one preamplifier and one occluded ear simulator Additionally a left pair can only be used for the left ear testing and the right pair can only be used for right ear testing See Left and Right Ident...
Page 15: ...ex driver remove the set screws on the head by turning the recessed set screw counterclockwise Ensure you store the screws as they are imperative to the acoustical quality of the device FIGURE 2 4 Rem...
Page 16: ...may need to be applied to the base however avoid twisting this may cause the cables to break Set head next to the stand with the cables loose FIGURE 2 6 Remove head and neck Step 6 Gently pull the wi...
Page 17: ...t of the head Feed the cable up through the head and out the side FIGURE 2 8 Remove AEC304 Step 8 Separate the 426M11 from the AEC304 by unscrewing the two devices Do not unscrew the ear canal extensi...
Page 18: ...FIGURE 2 10 Left and Right TAKE NOTE It is important to follow these steps exactly to ensure the quality of the acoustic testing To install AEC304 follow these steps Step 1 Connect AEC304 to 426M11 pr...
Page 19: ...he washer from the gasket FIGURE 2 12 Remove Gasket Step 4 Place head next to stand See Figure 2 13 Step 5 Measure approximately six inches of cable starting from the neck insert and running down and...
Page 20: ...together with a torque of 20 oz in to provide an optimal seal Step 7 While turning the screw squeeze the slit of the gasket together After you let go the slit should be fully closed FIGURE 2 14 Secur...
Page 21: ...les FIGURE 2 16 Cable slack Step 10 With the head vertically aligned with the neck mount the head onto the neck You will feel resistance and a pressure build up in the head this is normal CAUTION Do n...
Page 22: ...rews until set hand tight FIGURE 2 18 Neck set screws Step 12 Ensure the AEC304 is completely pushed into the head Using a torque screwdriver set to 40 oz in turn the set screws on the head until push...
Page 23: ...e space between the hat and the head hold the sling and the base of the device and then ease into the case You can store the ear simulator and preamplifier in the AEC206 and not in their cases Package...
Page 24: ...C L0035 Left pinna with hardness Shore 00 35 AEC R0035 Right pinna with hardness Shore 00 35 AEC LA25 Left pinna with hardness Shore A 25 AEC RA25 Right pinna with hardness Shore A 25 AEC206 RING alig...
Page 25: ...C Constant Current Excitation 2 to 20 mA Impedance Input 2x1010 Ohm 20 G Capacitance Input 0 2 pF Output Bias Voltage 10 to 14 VDC Impedance Output 50 Ohm Output Voltage 8 V TEDS Compliant Yes Physica...
Page 26: ...would be present rather than the actual geometry of the AEC206 The following transfer functions are in accordance with ANSI S3 36 2012 Free Field Response Table A 2 Free Field Response Frequency Hz Re...
Page 27: ...AEC206 Reference Manual Transfer Functions A 4 FIGURE A 3 Free Field Response 5 0 10 0 15 0 20 0 25 0 dB Re 10 0 5 0 0 0 5 0 10 0 15 0 20 0 25 0 20 200 2000 20000 dB Frequency Hz Response dB...
Page 28: ...d Response Frequency Hz Response dB Tolerance dB 100 0 0 1 125 0 0 1 160 0 3 1 200 0 3 1 250 0 3 1 3 315 1 0 1 3 400 1 7 1 5 500 2 2 1 5 630 2 9 1 5 800 3 7 1 5 1000 4 3 1 5 1250 5 8 1 5 1600 8 0 1 5...
Page 29: ...C206 Reference Manual Transfer Functions A 6 FIGURE A 4 Diffused Field Response 5 0 10 0 15 0 20 0 25 0 dB Response dB 10 0 5 0 0 0 5 0 10 0 15 0 20 0 25 0 20 200 2000 20000 dB Frequency Hz Response d...
Page 30: ...5 0 4 400 0 4 425 0 5 450 0 4 475 0 5 500 0 7 530 0 6 560 0 6 600 0 6 630 0 7 670 0 8 710 0 9 750 1 1 800 1 1 850 1 2 900 1 3 950 1 4 1000 1 6 1060 1 9 1120 2 1 1180 2 3 1250 2 5 1320 2 8 1400 3 2 150...
Page 31: ...AEC206 Reference Manual Transfer Functions A 8 FIGURE A 5 DRP to ERP Transfer Function 30 0 20 0 10 0 0 0 10 0 20 0 100 1000 10000 dB Frequency Hz DRP to ERP Transformation...
Page 32: ...AEC206 Reference Manual Declaration of Conformity A 9 A 5 Declaration of Conformity...
