GRAS 45CC Headphone Test Fixture
Precise support for all headphone sizes
High quality 1/2" and 1/4" measurement microphones
IEC 60318-1 ear simulators
ITU-T Rec. P51 mouth simulator
Easy in-situ calibration
Technology
Introduction
The 45CC Headphone Test Fixture is for dual-channel testing of headphones and headsets, and it is built on our vast experience in the field. With a focus on multiple configuration options and accurate and repeatable test results, the test fixture can easily be adapted to many different headphone/headset designs and sizes.
Main features
-
Dual-channel testing of headphones and headsets
-
Multiple configuration options: microphones or IEC 60318-1 ear simulators - with or without a mouth simulator
-
Distance between ears adjustable from 130 to 170 mm
-
Headband holder height adjustable from 75 to 135 mm
-
Reproducible positioning of DUT using 45CC’s unique positioning guides
-
High quality measurement microphones
-
IEC 60318-1 ear simulators
-
ITU-T Rec. P51 mouth simulator with built-in power amplifier
-
The microphones are mounted with snap fittings for easy calibration
All adjustments to headband position and height as well as the distance between the ear plates can be done quickly and very accurately. Precise scales make it easy to document all settings accurately, be it the headband position, the width between ears, or the position of the positioning guide. Therefore it is easy to set up other 45CCs to mirror the original setup.
Once the test fixture has been adjusted to fit a certain headphone, the design of headband holder, ear plates and the unique positioning system ensures that when testing identical headphones you will get the same positioning and fit from one test to the next. Therefore repeatability in a production line testing environment will be second to none with the 45CC. This makes the 45CC the unrivalled choice for demanding Quality Control and Production Line applications, but can also be used for Research and Development.
The Configurations
For your convenience, we have made 45CC available in a number of pre-configurations to suit specific testing needs. These are:
1/2" Microphones
45CC-1 with Externally Polarized 1/2" Microphones
45CC-2 with Prepolarized 1/2" Microphones
GRAS 45CC Headphone Test Fixture configured with 1/2" externally polarized or prepolarized microphones is primarily intended as a tool for Quality Control and Production Line testing of headphones.
Ear Simulators and 1/2" Microphones
45CC-3 with IEC 60318-1 Ear Simulators and Ext. Polarized 1/2" Microphones
45CC-4 with IEC 60318-1 Ear Simulators and Prepolarized 1/2" Microphones
GRAS 45CC Headphone Test Fixture configured with IEC60318-1 ear simulators and 1/2" externally polarized or prepolarized microphones is primarily intended as a tool for Quality Control and Production Line testing of headphones. Where the acoustical load from an ear simulator is required, the use of the ear simulators also means that testing according to IEC 60318-1, IEC60268-7 and ITU-T Rec. P.57 is possible.
Mouth Simulator and 1/2" Microphones
45CC-5 with Mouth Simulator and Ext. Polarized 1/2" Microphones
45CC-6 with Mouth Simulator and Prepolarized 1/2" Microphones
GRAS 45CC Headphone Test Fixture configured with 1/2" externally polarized or prepolarized microphones and the GRAS 44AA Mouth Simulator is primarily intended as a tool for Quality Control and Production Line testing of communication headsets.
Mouth Simulator and Ear Simulators
45CC-7 with Mouth Simulator, IEC 60318-1 Ear Simulators and Ext. Polarized 1/2" Microphones
45CC-8 with Mouth Simulator, IEC 60318-1 Ear Simulators and Prepolarized 1/2" Microphones
GRAS 45CC Headphone Test Fixture configured with IEC60318-1 ear simulators, 1/2" externally polarized or prepolarized microphones and the GRAS 44AA Mouth Simulator is primarily intended as a tool for Quality Control in R&D and Production Line testing of communication headsets.
1/4" Microphones
45CC-9 with Externally Polarized 1/4" Microphones
45CC-10 with Prepolarized 1/4" Microphones
GRAS 45CC Headphone Test Fixture configured with 1/4" externally polarized or prepolarized microphones extends the frequency range to 70 kHz for high frequency testing.
Mouth Simulator and 1/4" Microphones
45CC-11 with Mouth Simulator and Ext. Polarized 1/4" Microphones
45CC-12 with Mouth Simulator and Prepolarized 1/4" Microphones
GRAS 45CC Headphone Test Fixture configured with 1/4" externally polarized or prepolarized microphones and the GRAS 44AA Mouth Simulator is for testing of communication headsets. The microphones extends the frequency range to 70 kHz while the mouth simulator has a frequency range of 100 Hz to 16 kHz.
Warranty
GRAS offers 5 years warranty against defective materials and workmanship.
Service
If you accidentally damage the diaphragm on a GRAS microphone, we can—in most cases—replace it at a very reasonable cost and with a short turn-around time. This not only protects your investment, but also pleases your quality assurance department because you don’t have to worry about new serial numbers, etc.
Calibration
Before leaving the factory, all GRAS microphones are calibrated in a controlled laboratory environment using traceable calibration equipment.
Depending on the use, measurement environment, and internal quality control programs, we recommend recalibrating the microphone at least once a year.
Specifications
1/2" MICROPHONES | ||
Sensitivity | mV/Pa | 12.5 |
Frequency Response (±2 dB) | Hz | 3.15 Hz - 20 k |
Dynamic range - 40AG (with 26AC preamp) | dB | 25 dB(A) - 164 |
Dynamic range - 40AO (with 26CK preamp) | dB | 25 dB(A) - 150 |
Standard | WS2P | |
1/4" MICROPHONES | ||
Sensitivity | mV/Pa | 1.6 |
Frequency Response (±2 dB) | Hz | 4 - 70 k |
Dynamic range - 40BP (with 26AC preamp) | dB | 39 dB(A) - 169 |
Dynamic range - 40BD (with 26CS preamp) | dB | 44 dB(A) - 166 |
Standard | WS3P | |
GRAS RA0039 EAR SIMULATOR | ||
Standards |
ANSI S3.7 |
|
GRAS 44AA MOUTH SIMULATOR | ||
Frequency response @ maximum output level | Hz | 100 to 16 k |
Maximum output | dB | 100 |
Maximum power, continuous | W | 20 |
Amplifier gain | dB | 10 |
Input impedance | Ω | 20 k |
Output impedance | Ω | 8 |
Power supply | V DC | 24 |
Standards | ITU-T Rec. P51 IEEE 269-2010 |
|
TEST FIXTURE | ||
Width between ears | mm | Adjustable from 130 to 170 |
Height of headband holder | mm | Adjustable from 75 to 135 |
Horizontal position of headband holder | mm | Adjustable +/- 5 |
Ear plate angle | ° | 4.5 (ISO 4869-3) |
Diameter of ear plate | mm | 128 |
Positioning guides | Continuous adjustment of horizontal and vertical position. Two-point support for all headphone sizes | |
Weight | kg | 3 |
GRAS Sound & Vibration reserves the right to change specifications without notice.
Dimensions
Ordering info
Included items
45CC-1 - with Externally Polarized Microphones
45CC | Test fixture |
GRAS 69CC-1 | LEMO Pressure Mic. Set for 45CC, 2 pcs, comprising: |
GRAS 40AG | 1/2" Ext. Polarized Pressure Microphone |
GRAS 26AC-1 | Standard Preamplifier with 3 m Integrated Cable |
GRAS GR0010 | Adapter for 1/4" preamplifier and 1/2" microphone |
45CC-2 - with Prepolarized Microphones
45CC | Test fixture |
GRAS 69CC-2 | Pressure Mic. Set for 45CC, 2 pcs, comprising: |
GRAS 40AO | 1/2" Prepolarized Pressure Microphone |
GRAS 26CK | 1/2" CCP Preamplifier with Microdot Connector, Very Short |
GRAS AA0070 | 3 m Microdot-BNC Cable, 2 pcs |
45CC-3 with IEC 60318-1 Ear Simulators and Externally Polarized Microphones
45CC | Test fixture |
GRAS RA0039 | IEC 60318-1 Ear Simulator, 2 pcs |
GRAS 69CC-1 | LEMO Pressure Mic. Set for 45CC, 2 pcs, comprising: |
GRAS 40AG | 1/2" Ext. Polarized Pressure Microphone |
GRAS 26AC-1 | Standard Preamplifier with 3 m Integrated Cable |
GRAS GR0010 | Adapter for 1/4" preamplifier and 1/2" microphone |
45CC-4 - with IEC 60318-1 Ear Simulators and Prepolarized Microphones
45CC | Test fixture |
GRAS RA0039 | IEC 60318-1 Ear Simulator, 2 pcs |
GRAS 69CC-2 | CCP Pressure Mic. Set for 45CC, 2 pcs, comprising: |
GRAS 40AO | 1/2" Prepolarized Pressure Microphone |
GRAS 26CK | 1/2" CCP Preamplifier with Microdot Connector, Very Short |
GRAS AA0070 | 3 m Microdot-BNC Cable, 2 pcs |
45CC-5 - with Mouth Simulator and Externally Polarized Microphones
45CC | Test fixture |
GRAS 44AA | Mouth Simulator according to ITU-T Rec. P51 with built-in power amplifier |
GRAS AA0035 | BNC-BNC Cable |
GRAS 69CC-1 | LEMO Pressure Mic. Set for 45CC, 2 pcs, comprising: |
GRAS 40AG | 1/2" Ext. Polarized Pressure Microphone |
GRAS 26AC-1 | Standard Preamplifier with 3 m Integrated Cable |
GRAS GR0010 | Adapter for 1/4" preamplifier and 1/2" microphone |
45CC-6 - with Mouth Simulator and Prepolarized Microphones
45CC | Test fixture |
GRAS 44AA | Mouth Simulator according to ITU-T Rec. P51 with built-in power amplifier |
GRAS AA0035 | BNC-BNC Cable |
GRAS 69CC-2 | CCP Pressure Mic. Set for 45CC, 2 pcs, comprising: |
GRAS 40AO | 1/2" Prepolarized Pressure Microphone |
GRAS 26CK | 1/2" CCP Preamplifier with Microdot Connector, Very Short |
GRAS AA0070 | 3 m Microdot-BNC Cable, 2 pcs |
45CC-7 with Mouth Simulator, IEC 60318-1 Ear Simulators and Externally Polarized Microphones
45CC | Test fixture |
GRAS 44AA | Mouth Simulator according to ITU-T Rec. P51 with built-in power amplifier |
GRAS AA0035 | BNC-BNC Cable |
GRAS RA0039 | IEC 60318-1 Ear Simulator, 2 pcs |
GRAS 69CC-1 | LEMO Pressure Mic. Set for 45CC, 2 pcs, comprising: |
GRAS 40AG | 1/2" Ext. Polarized Pressure Microphone |
GRAS 26AC-1 | Standard Preamplifier with 3 m Integrated Cable |
GRAS GR0010 | Adapter for 1/4" preamplifier and 1/2" microphone |
45CC-8 with Mouth Simulator, IEC 60318-1 Ear Simulators and Prepolarized Microphones
45CC | Test fixture |
GRAS 44AA | Mouth Simulator according to ITU-T Rec. P51 with built-in power amplifier |
GRAS AA0035 | BNC-BNC Cable |
GRAS RA0039 | IEC 60318-1 Ear Simulator, 2 pcs |
GRAS 69CC-2 | CCP Pressure Mic. Set for 45CC, 2 pcs, comprising: |
GRAS 40AO | 1/2" Prepolarized Pressure Microphone |
GRAS 26CK | 1/2" CCP Preamplifier with Microdot Connector, Very Short |
GRAS AA0070 | 3 m Microdot-BNC Cable, 2 pcs |
45CC-9 - with Externally Polarized 1/4" Microphones
45CC | Test fixture |
GRAS 69CC-3 | LEMO Pressure Mic. Set for 45CC, 2 pcs, comprising: |
GRAS 40BP | 1/4" Ext. Polarized Pressure Microphone |
GRAS 26AC-1 | Standard 1/4" Preamplifier with 3 m Integrated Cable |
GRAS GR2039 | 1/4" Microphone Holder |
45CC-10 - with Prepolarized 1/4 Microphones
45CC | Test fixture |
GRAS 69CC-4 | CCP Pressure Mic. Set for 45CC, 2 pcs, comprising: |
GRAS 40BD | 1/4" Prepolarized Pressure Microphone |
GRAS 26CS | 1/4" CCP Preamplifier with Microdot Connector, Very Short |
GRAS AA0070 | 3 m Microdot-BNC Cable, 2 pcs |
45CC-11 - with Mouth Simulator and Externally 1/4" Polarized Microphones
45CC | Test fixture |
GRAS 44AA | Mouth Simulator according to ITU-T Rec. P51 with built-in power amplifier |
GRAS AA0035 | BNC-BNC Cable |
GRAS 69CC-3 | LEMO Pressure Mic. Set for 45CC, 2 pcs, comprising: |
GRAS 40BP | 1/4" Ext. Polarized Pressure Microphone |
GRAS 26AC-1 | Standard Preamplifier with 3 m Integrated Cable |
GRAS GR2039 | 1/2" Microphone Holder |
45CC-12 - with Mouth Simulator and Prepolarized 1/4" Microphones
45CC | Test fixture |
GRAS 44AA | Mouth Simulator according to ITU-T Rec. P51 with built-in power amplifier |
GRAS AA0035 | BNC-BNC Cable |
GRAS 69CC-4 | CCP Pressure Mic. Set for 45CC, 2 pcs, comprising: |
GRAS 40BD | 1/4" Prepolarized Pressure Microphone |
GRAS 26CS | 1/4" CCP Preamplifier with Microdot Connector, Very Short |
GRAS AA0070 | 3 m Microdot-BNC Cable, 2 pcs |
GRAS Sound & Vibration reserves the right to change accessories without notice.