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Summary of Contents for GRAS 45CC Series
- Page 1 Instruction Manual GRAS 45CC Headphone Test Fixture 45CC-1 to -4, -9, -10 and -14 to -19...
- Page 2 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 A/S is not liable or responsible for any errors or inaccuracies that may appear in this document.
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Page 3: Table Of Contents
Mounting the Ear Plate Assemblies.........................27 Mounting and Unmounting the Anthropometric Pinnae ................28 Mounting the Mouth Simulator ........................30 Adjusting the Headband Holder Height ......................31 Adjusting the Horizontal Position ........................31 Adjusting the Positioning Guides ........................32 Instruction Manual GRAS 45CC Headphone Test Fixture | 3... - Page 4 For further information, see the manual for your Pistonphone or Sound Calibrator......36 Level Calibration with a Sound Calibrator ....................37 Technical Specifications ........................... 37 Warranty, Service and Repair........................39 Calibration ................................39 Warranty .................................39 Service and Repairs ............................39 Instruction Manual GRAS 45CC Headphone Test Fixture | 4...
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Page 5: Quick Assembly Guide
Quick Assembly Guide GRAS 45CC configurations come fully assembled and tested, however the Ear Plate Assemblies must be mounted after unpacking. For those who do not need a detailed instruction, the illustra- tion below should be enough to get started. -
Page 6: Introduction
• Assembly and Adjustments explains the assembly and adjustment procedures necessary to prepare the 45CC for use. • Calibration shows how to dismantle a microphone for calibration. For specific information about how to calibrate, refer to the documentation for your calibration equipment. Instruction Manual GRAS 45CC Headphone Test Fixture | 6... -
Page 7: The 45Cc Configurations
45CC-9 with Externally Polarized ¼″ Microphones 45CC-10 with Prepolarized ¼″ Microphones 45CC configured with ¼″ externally polarized or prepolarized microphones extends the frequency range to 70 kHz for high-frequency testing of on- and around-ear headpones. 7 | GRAS 45CC Headphone Test Fixture Instruction Manual... - Page 8 IEC 60318-4 and ITU-T Rec. P.57 Type 3.3 and the acoustical load from an ear simulator is required. These configurations can be used to test any style of headphone or headset (with the optional GRAS 44AA or 44AB Mouth Simulator), including in-ear and insert earphones. 45CC Configured with High-frequency Ear Simulators, Human-like Pinnae and...
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Page 9: Delivered Items
F r o n t ½″ Microphone Holder 40AD p i n B a c k G u i d e *The parts are glued together and must not be disassembled 46BP-1 GR2013 GR1997 9 | GRAS 45CC Headphone Test Fixture Instruction Manual... -
Page 10: 45Cc-2 Prepolarized ½" Microphones
½″ Microphone Holder 46BP 46BD p i n B a c k G u i d e *The parts are glued together and must not be disassembled 40AD GR2013 GR1997 46BP-1 Instruction Manual GRAS 45CC Headphone Test Fixture | 1 0... -
Page 11: 45Cc-3 Iec 60318-1 Ear Simulators And Externally Polarized ½" Microphones
F r o n t ½″ Microphone Holder 40AD p i n B a c k G u i d e *The parts are glued together and must not be disassembled 46BP-1 GR2013 GR1997 1 1 | GRAS 45CC Headphone Test Fixture Instruction Manual... -
Page 12: 45Cc-4 Iec 60318-1 Ear Simulators And Prepolarized ½" Microphones
½″ Microphone Holder 46BP 46BD p i n B a c k G u i d e 40AD *The parts are glued together and must not be disassembled GR2013 GR1997 46BP-1 Instruction Manual GRAS 45CC Headphone Test Fixture | 1 2... -
Page 13: 45Cc-9 Externally Polarized ¼" Microphones
Specifications match those of 26AC-1 ¼″ Microphone Holder p i n B a c k G u i d e *The parts are glued together and must not be disassembled 1 3 | GRAS 45CC Headphone Test Fixture Instruction Manual... -
Page 14: 45Cc-10 Prepolarized ¼" Microphones
Specifications match those of 26CS p i n B a c k ¼″ Microphone Holder G u i d e *The parts are glued together and must not be disassembled Instruction Manual GRAS 45CC Headphone Test Fixture | 1 4... -
Page 15: 45Cc-14 Iec 60318-4 Ear Simulators, Anthropometric Pinnae And Ext. Pol. Microphones
B a c k G u i d e Exterior Ear Canal for Ear Simulator Union Nut for Ear Simulator *The parts are glued together and must not be disassembled 1 5 | GRAS 45CC Headphone Test Fixture Instruction Manual... -
Page 16: 45Cc-15 Iec 60318-4 Ear Simulators, Anthropometric Pinnae And Prepolarized Microphones
B a c k G u i d e Exterior Ear Canal for Ear Simulator Union Nut for Ear Simulator *The parts are glued together and must not be disassembled Instruction Manual GRAS 45CC Headphone Test Fixture | 1 6... -
Page 17: 45Cc-16 High-Frequency Ear Simulators, Anthropometric Pinnae And Ext. Pol. Microphones
B a c k G u i d e Exterior Ear Canal for Ear Simulator Union Nut for Ear Simulator *The parts are glued together and must not be disassembled 1 7 | GRAS 45CC Headphone Test Fixture Instruction Manual... - Page 18 B a c k G u i d e Exterior Ear Canal for RA0045 Union Nut fo RA0045 *The parts are glued together and must not be disassembled Instruction Manual GRAS 45CC Headphone Test Fixture | 1 8...
- Page 19 B a c k G u i d e Exterior Ear Canal for Ear Simulator Union Nut for Ear Simulator *The parts are glued together and must not be disassembled 1 9 | GRAS 45CC Headphone Test Fixture Instruction Manual...
- Page 20 B a c k G u i d e Exterior Ear Canal for Ear Simulator Union Nut for Ear Simulator *The parts are glued together and must not be disassembled Instruction Manual GRAS 45CC Headphone Test Fixture | 2 0...
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Page 21: Optional Mouth Simulators
Optional Mouth Simulators All 45CC configurations can be used with a GRAS mouth simularot. For more information on the mouth simulators, see their respective Instruction Manual. All configurations have the mouth simulator mouth holder included, see below. Included Items Mouth Simulator according to ITU-T Rec. -
Page 22: General Description
- 20 mm Ear Plate Width adjustment 130 to 170 mm 4 mm Allen Key 1 2 m m Fig. 1. Front view of 45CC. Instruction Manual GRAS 45CC Headphone Test Fixture | 2 2 F r o n t... -
Page 23: Side View
Min: 75 mm Max: 135 mm Ear Plate 44AA Positioning Guide Mouth Simulator Platform for Mouth Simulator 4 mm Allen 1 2 m m Fig. 2. Side view—with optional mouth simulator. 2 3 | GRAS 45CC Headphone Test Fixture Instruction Manual... -
Page 24: Rear View
F r o n t The Holder (below) is used with the RA0039 Ear Simulator only, as the thread it provides is an integral part of the two flanges. B a c k Instruction Manual GRAS 45CC Headphone Test Fixture | 2 4... -
Page 25: The Microphone Holder
B a c k Exploded view ½″ mic. holder assembly ¼″ mic. holder assembly Fig. 5. ½″ and ¼″ microphone mounted in microphone holder. Do not disassemble as shown in a). 2 5 | GRAS 45CC Headphone Test Fixture Instruction Manual... -
Page 26: The Positioning Guide
Plate Assemblies in Slots in the fixture. As shown in Fig. 7 below, the ear plates have two long Rods that can be pushed into the Slots and secured each with two screws from the rear. F r o n t B a c k Instruction Manual GRAS 45CC Headphone Test Fixture | 2 6... -
Page 27: Mounting The Ear Plate Assemblies
Slide in the Ear Plate Assemblies with the headphone Positioning Guides facing downwards. Note: Remember to tighten the four screws on the back of the unit. F r o n t B a c k 2 7 | GRAS 45CC Headphone Test Fixture Instruction Manual... -
Page 28: Mounting And Unmounting The Anthropometric Pinnae
1. Loosen the screw holding the Ear Simulator (see Fig. 9). Fig. 9. Showing the screws locations for locking the ear simulator. Pull out the Ear Simulator. 2. Screw the Pinna onto the Ear Simulator (see Fig. 10). Instruction Manual GRAS 45CC Headphone Test Fixture | 2 8... - Page 29 Pulling here repeatedly may the pinna—with a finger in the damage it! ear canal—gently pry outwards Fig. 11. Showing where to pull when removing the ear simulator+ anthropometric pinna from 45CA. 2 9 | GRAS 45CC Headphone Test Fixture Instruction Manual...
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Page 30: Mounting The Mouth Simulator
1. Place the 45CC in a way that lets you access the Base plate (“foot”) from the underside. 2. Guide the three Bolts through the three holes in the base plate. 3. Fasten the Bolts using the YY0034 socket screwdriver. Instruction Manual GRAS 45CC Headphone Test Fixture | 3 0... -
Page 31: Adjusting The Headband Holder Height
Position 3: + 10 mm. Both spacers are used between headband holder and neck. 3 1 | GRAS 45CC Headphone Test Fixture Instruction Manual... -
Page 32: Adjusting The Positioning Guides
The scales on the two rods do not indicate the distance to the DUT. They are meant as a means to make it easy to document and repeat the settings onto more 45CC Headphone Test Fixtures. F r o n t B a c k Instruction Manual GRAS 45CC Headphone Test Fixture | 3 2... -
Page 33: Calibration And Verification
Important. The parts of the microphone assembly—microphone, microphone holder, ½″ to ¼″ adapter and preamplifier—are glued together and should under no circumstances be disassembled. If a need for this arises, the unit must be returned to GRAS for service. 3 3 | GRAS 45CC Headphone Test Fixture... -
Page 34: For Further Information, See The Manual For Your Sound Calibrator
Important. It is important that the adapter is pushed as far down into the pistonphone as it will go. To ensure this, you must either tighten the pistonphone’s collar to ensure that it is in its lowest possible position, or remove it entirely, as shown below. Instruction Manual GRAS 45CC Headphone Test Fixture | 3 4... - Page 35 The sensitivity should be within ±0.3 dB of the sensitivity given on the Calibration Chart for the microphonoe when the Piston phone has been corrected for static pressure, etc. See Pis- tonphone manual. 3 5 | GRAS 45CC Headphone Test Fixture Instruction Manual...
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Page 36: 45Cc-14 To -19
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. Instruction Manual GRAS 45CC Headphone Test Fixture | 3 6... -
Page 37: Level Calibration With A Sound Calibrator
IEC 61094-4 ½″ WS2P pressure microphones in the ear plate plane IEC 60318-1 ear simulators in the ear plate plane IEC 61094-4 ¼″ WS3P pressure microphones in the ear plate plane 3 7 | GRAS 45CC Headphone Test Fixture Instruction Manual... - Page 38 Max = 135 mm Continuous adjustment of distance and angle Min = 130 mm D = 128 mm Max = 170 mm Fig. 19. 45CC’s key adjustments for different headphone sizes 3 8 | GRAS 45CC Headphone Test Fixture Instruction Manual...
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Page 39: Warranty, Service And Repair
2002/96/EC RoHS directive: 2002/95/EC GRAS Sound & Vibration continually strives to improve the quality of our products for our custom- ers; therefore, the specifications and accessories are subject to change. 3 9 | GRAS 45CC Headphone Test Fixture Instruction Manual...
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