GRAS 45CC Headphone Test Fixture

Precise support for all headphone sizes
High quality 1/2" 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 QC and PL applications.

See also the brochure for 45CC.

The Configurations

For your convenience, we have made 45CC available in 8 different pre-configurations. 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 QC and PL testing of headphones. Except for the mounting of the ear plate assemblies, 45CC comes fully assembled and tested from the factory.

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 QC and PL testing of headphones. Where the acoustical load from an ear simulator is required, the use of the IEC 60318-1 ear simulators also mean that testing according to IEC 60318-1 and ITU-T Recommendations P.57 is possible. Except for the mounting of the ear plate assemblies, 45CC comes fully assembled and tested from the factory.

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 QC and PL testing of communication headsets. Except for the mounting of the ear plate assemblies and the mouth simulator, 45CC comes fully assembled and tested from the factory.

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 QC and PL testing of communication headsets. Where the acoustical load from an ear simulator is required, the use of the IEC 60318-1 ear simulators also mean that testing according to IEC 60318-1 and ITU-T Recommendations P.57 is possible. Except for the mounting of the ear plate assemblies and the mouth simulator, 45CC comes fully assembled and tested from the factory.

 

Specifications

CE/RoHS compliant/WEEE registered
yes/yes/yes

1/2" MICROPHONES

Sensitivity mV/Pa 12.5
Frequency Response Hz 3.15 - 20 k
40AG (with 26AC preamp) dB 25 (A) - 164
40AO (with 26CK preamp) dB 25 (A) - 150

EAR SIMULATOR

RA0039   IEC 60318-1

MOUTH SIMULATOR

Maximum power, continuous W 20
Gain dB 10
Output impedance Ω 8
Power supply V DC 24

TEST FIXTURE

Adjustable width between ears mm 130 - 170
Adjustable height of headband holder mm 75 - 135
Adjustable horizontal position of headband holder mm  +/- 5
Ear plate angle ° (ISO 4869-3) 4.5
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 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-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

  GRAS Sound & Vibration reserves the right to change accessories without notice.

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