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

GRAS 45CC Headphone Test Fixture

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

CE/RoHS compliant/WEEE registered
yes/yes/yes
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
IEC 60318-1
ITU-T Rec. P.57

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 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 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 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 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  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 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.

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