GRAS 45CA Headphone/Hearing-protector Test Fixture

ISO: 4869-3
IEC: 60318-1 and 60318-4
depending on configuration

GRAS 45CA Headphone/Hearing-protector Test Fixture

Technology

Introduction

GRAS 45CA provides the basis for reliable and exact measurements and is designed with

  • A test fixture mounted on a resilient base that reduces the noise floor to a minimum in a typical test situation. Foam plugs and grease are supplied to avoid sound leakage along the cable

  • A test fixture head, made for optimizing the acoustic isolation

  • An acoustic cup and plug for testing the acoustic isolation

  • A range of moulded-rubber KEMAR pinnae, e.g. for testing ear plugs, can be fitted

The 45CA’s robust design is ideally suited for binaural testing of active and passive earplugs, as well as circumaural hearing protectors.

It is primarily intended for testing the performance of hearing-protection devices such as ear plugs and ear muffs (supra-aural and circum-aural) but can also be used for testing sound sources such as earphones and headphones. It is fitted with either microphones or ear simulators, depending on the device to test and the standard to comply with.

Compliance with ISO 4869-3, IEC 60318-1 and IEC 60318-4 assures technicians, decision makers, and authorities of repeatability and transparent data when developing and verifying hearing protectors.

The pinnae for the 45CA are basically the same as the standardized KEMAR pinnae, but rounded to fit the large 45CA base plate. This large base plate reduces or eliminates the risk of leakage.

The 45CA includes two plugs for measuring the acoustic isolation in a closed ear.

We recommend calibration prior to each use to ensure the accuracy of your measurements. The GRAS 42AP Intelligent Pistonphone or the GRAS 42AA Pistonphone are ideally suited for this task.

Typical applications and use

45CA Headphone/Hearing-protector Test Fixture, Non-configured is a versatile test platform that you can configure to suit specific needs. The most common configurations can be ordered fully assembled, calibrated and tested from GRAS These are:

45CA-1 Headphone/Hearing-protector Test Fixture, ISO 4869-3 1" Mic. LEMO

The 45CA-1 is a configuration for testing of outside-the-ear devices, i.e. for measuring the insertion loss of ear muffs and the sound quality of headphones. In this configuration, 45CA is configured with two GRAS 40EN 1" pressure microphones. The configuration conforms with ISO 4869-3.

45CA-2 Headphone/Hearing-protector Test Fixture, ISO 4869-3 1/2" Mic. CCP

The 45CA-2 is a configuration for testing of outside-the-ear devices, i.e. for measuring the insertion loss of ear muffs and the sound quality of headphones. In this configuration, 45CA is configured with two GRAS 40AD 1/2" pressure microphones. This configuration conforms with ISO 4869-3

45CA-3 Headphone/Hearing-protector Test Fixture, IEC 60318-1 LEMO

45CA-3 is configured for measurement of insertion loss of circum-aural hearing protectors and the sound quality of headphones, with two RA0039 Ear Simulators with 40AG 1/2" externally polarized microphones. The configuration conforms with IEC 60318-1. The RA0039 cannot be used with a pinna simulator, and therefore cannot be used for measuring in-ear earphones.

45CA-4 Headphone/Hearing-protector Test Fixture, IEC 60318-1 CCP

The 45CA-4 is configured with two RA0039 Ear Simulators with 40AO 1/2" prepolarized microphones. The configuration complies with IEC 60318-1 and is used for measurements of insertion loss of circum-aural hearing protectors and sound quality of headphones. The RA0039 cannot be used with a pinna simulator, and therefore cannot be used for measuring in-ear earphones.

45CA-5 Headphone/Hearing-protector Test Fixture, IEC 60318-4 LEMO

The 45CA-5 is configured with RA0045 externally polarized ear simulators for use with pinna simulators. It can be used for measurements of the insertion loss of ear muffs and ear plugs, and the sound quality of earphones and headphones. The configuration complies with IEC 60318-4.

45CA-6 Headphone/Hearing-protector Test Fixture, IEC 60318-4 CCP

The 45CA-6 is configured with RA0045-S1 prepolarized ear simulators for use with pinna simulators. This configuration can be used for measurements of the insertion loss of ear muffs, sound quality of earphones and  hearing aids. The configuration complies with IEC 60318-4.

45CA-7 Headphone/Hearing-protector Test Fixture, IEC 60318-4 LEMO, with Anthropometric Pinnae

The 45CA-7 is configured with RA0045 externally polarized ear simulators and anthropometric pinnae. It can be used for measurements of the insertion loss of ear muffs and ear plugs, and the sound quality of earphones and headphones. The configuration complies with IEC 60318-4.

45CA-8 Headphone/Hearing-protector Test Fixture, IEC 60318-4 CCP, with Anthropometric Pinnae

The 45CA-8 is configured with RA0045-S1 prepolarized ear simulators and anthropometric pinnae. This configuration can be used for measurements of the insertion loss of ear muffs, sound quality of earphones and  hearing aids. The configuration complies with IEC 60318-4.

45CA-9 Headphone/Hearing-protector Test Fixture, High Resolution and  Anthropometric Pinnae, LEMO

The 45CA-9 is configured with RA0401 externally polarized high resolution ear simulators and anthropometric pinnae. It can be used for measurements of  hearing aids, earphones and headphones up to 20 kHz.. The configuration complies with IEC 60318-4.

45CA-10 Headphone/Hearing-protector Test Fixture, High Resolution and  Anthropometric Pinnae, CCP

The 45CA-10 is configured with RA0402 prepolarized ear simulators and anthropometric pinnae. It can be used for measurements of  hearing aids, earphones and headphones up to 20 kHz.. The configuration complies with IEC 60318-4.

The application specific items for each of these configurations are listed under the tab Ordering Information.

System verification

For daily verification and check of your measurement setup, we recommend using a calibrator like GRAS 42AG Multifunction Sound Calibrator.

For proper sensitivity calibration, we recommend using a pistonphone like GRAS 42AP Intelligent Pistonphone.

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.

Performance and warranty

The GRAS 45CA is made of components from our standard portfolio and are all manufactured of high-quality material and branded parts that were chosen and processed to ensure life-long stability and robustness. This enables us to offer 5 years warranty against defective materials and workmanship.
Exceptions: The warranty period for cables is 6 months.

Specifications

IEC standard
Dep. on conf.
ITU-T recommondations
P.380
CE/RoHS compliant/WEEE registered
Yes/Yes/Yes
Weight
g / oz
11.6 k / 409.18

45CA-1 and 45CA-2

   

Self Insertion Loss, measured with closed ear simulators

> 50 dB

80 - 250 Hz

Self Insertion Loss, measured with closed ear simulators

> 65 dB

 350 - 4000 hz

Self Insertion Loss, measured with closed ear simulators

> 55 dB

5000 - 20000 Hz

Specs for the GRAS 40EN 1" Externally Polarized Pressure Microphone can be found here.

   

Specs for the GRAS 40AD 1/2" Prepolarized Pressure Microphone can be found here.

   

45CA-3 and 45CA-4

   

GRAS RA0039 Ear Simulator

Specs can be found here:

www.gras.dk/RA0039

GRAS 40AG 1/2" Externally Polarized Pressure Microphone

Specs can be found here:

www.gras.dk/40AG

GRAS 40AO 1/2" Prepolarized Pressure Microphone

Specs can be found here:

www.gras.dk/40AO

45CA-3 and 45CA-4

   

GRAS RA0039 Ear Simulator

Specs can be found here:

www.gras.dk/RA0039

GRAS 40AG 1/2" Externally Polarized Pressure Microphone

Specs can be found here:

www.gras.dk/40AG

GRAS 40AO 1/2" Prepolarized Pressure Microphone

Specs can be found here:

www.gras.dk/40AO

45CA-5 to 45CA-8

   

GRAS RA0045 Ear Simulator

Specs can be found here:

www.gras.dk/RA0045

GRAS RA0045-S1 Ear Simulator

Specs can be found here:

www.gras.dk/RA0045-s1

45CA-9 to 45CA-10

   

GRAS RA0401 Ear Simulator

Specs can be found here:

www.gras.dk/RA0401

GRAS RA0402 Ear Simulator

Specs can be found here:

www.gras.dk/RA0402

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

Ordering info

Included items with GRAS 45CA

Common to all configurations - and delivered when ordered non-configured

GRAS GR1085

Cover Plate, 2 pcs

GRAS GR0970

Insert

GRAS GR0974

Acoustic Cup (for acoustic isolation testing)

GRAS RA0178

1'' Acoustic Plug

GRAS GR1281

Foam plug for leakage sealing (2 pcs)

GRAS MI0016

7 ml Silicon grease for leakage sealing

GRAS YY0019

Allen Key, 6 mm

GRAS YY0016

Allen Key, 2.5 mm

GRAS YY0018

Allen Key, 2 mm

GRAS YY0022

Allen Key, 1.5

Configurations

10 different pre-configurations of 45CA are available. Each of these are sold fully assembled and tested, ready for use.

45CA-1 1” Headphone/Hearing-Protector Test Fixture, ISO 4869-3 1" Mic. LEMO - for test of ear muffs

GRAS 40EN

1" Ext. Polarized Pressure Microphone (2 pcs)

GRAS RA0017

Adapter for 1" microphone and 1/2" preamplifier (2 pcs)

GRAS RA0003

Adapter for 1/2" microphone and 1/4" preamplifier (2 pcs)

GRAS 26AS

1/4" Standard Preamplifier with 3 m integrated cable, very short (2 pcs)

45CA-2 1/2” Headphone/Hearing-Protector Test Fixture, ISO 4869-3 1/2" Mic. CCP - for test of ear muffs

GRAS 40AD

1/2" Prepolarized Pressure Microphone, High Sensitivity (2 pcs)

GRAS RA0177

1” Microphone protection grid (2 pcs)

GRAS RA0058

1/2'' to 1'' Microphone Adapter (2 pcs)

GRAS GR0010

1/2" to 1/4" Adapter (2 pcs)

GRAS 26CS

1/4" CCP Preamplifier with Microdot connector, very short (2 pcs)

GRAS AA0070

3 m Microdot - BNC Cable (2 pcs)

 45CA-3 Headphone/Hearing-Protector Test Fixture, IEC 60318-1 LEMO - for test of ear muffs and headphones

GRAS RA0039

Ear Simulator according to IEC 60318-1 (2 pcs)

GRAS 40AG

1/2" Ext. Polarized Pressure Microphone (2 pcs)

GRAS RA0176

1/2'' to 1'' Adapter for RA0039 (2 pcs)

GRAS GR0010

1/2" to 1/4" Adapter (2 pcs)

GRAS 26AS

1/4" Standard Preamplifier with 3 m integrated cable, very short (2 pcs)

 45CA-4 Headphone/Hearing-Protector Test Fixture, IEC 60318-1 CCP - for test of ear muffs and headphones

GRAS RA0039

Ear Simulator according to IEC 60318-1 (2 pcs)

GRAS 40AO

1/2" Prepolarized Pressure Microphone (2 pcs)

GRAS RA0176

1/2''-1'' Adapter for RA0039 (2 pcs

GRAS GR0010

1/2" to 1/4" Adapter (2 pcs)

GRAS 26CS

1/4" CCP Preamplifier with Microdot connector, very short (2 pcs)

GRAS AA0070

3 m Microdot - BNC Cable (2 pcs)

 45CA-5 Headphone/Hearing-Protector Test Fixture, IEC 60318-4 LEMO - for test of ear muffs, ear plugs, headphones and ear phones

GRAS KB0070

Large Right KEMAR Pinna, 55 Shore OO

GRAS KB0071

Large Left KEMAR Pinna, 55 Shore OO

GRAS GR1075

Pinna Holder Plate

GRAS GR1069

Ear Canal Extension

GRAS RA0045

Externally Polarized Ear Simulator according to IEC 60318-4 (60711) (2 pcs)

GRAS GR0010

External Ear Canal

GRAS 26AS

1/4" Standard Preamplifier with 3 m integrated cable, very short (2 pcs)

 45CA-6 Headphone/Hearing-Protector Test Fixture, IEC 60318-4 CCP - for test of ear muffs, ear plugs, headphones and ear phones

GRAS KB0070

Large Right KEMAR Pinna, 55 Shore OO

GRAS KB0071

Large Left KEMAR Pinna, 55 Shore OO

GRAS GR1075

Pinna Holder Plate

GRAS GR1069

Ear Canal Extension

GRAS RA0045-S1

Prepolarized Ear Simulator according to IEC 60318-4 (60711) (2 pcs)

GRAS GR0010

External Ear Canal

GRAS 26CS

1/4" CCP Preamplifier with Microdot connector, very short (2 pcs)

GRAS AA0018

3 m Microdot - BNC Cable, High Temp (2 pcs)

 45CA-7 Headphone/Hearing-Protector Test Fixture, IEC 60318-4 LEMO, with Anthropometric Pinnae - for test of ear muffs, ear plugs, headphones and ear phones

GRAS KB5010

Large Right Anthropometric KEMAR Pinna 35 Shore OO

GRAS KB5011

Large Left Anthropometric KEMAR Pinna 35 Shore OO

GRAS GR1075

Pinna Holder Plate

GRAS RA0045

Externally Polarized Ear Simulator according to IEC 60318-4 (60711) (2 pcs)

GRAS GR0010

1/2" to 1/4" Adapter

GRAS 26AS

1/4" Standard Preamplifier with 3 m integrated cable, very short (2 pcs)

GRAS GR0408

Exterior Ear Canal (for calibration)

GRAS GR0409

Union Nut (for calibration)

 45CA-8 Headphone/Hearing-Protector Test Fixture, IEC 60318-4 CCP, with Anthropometric Pinnae - for test of ear muffs, ear plugs, headphones and ear phones

GRAS KB5010

Large Right Anthropometric KEMAR Pinna 35 Shore OO

GRAS KB5011

Large Left Anthropometric KEMAR Pinna 35 Shore OO

GRAS GR1075

Pinna Holder Plate

GRAS RA0045-S1

Prepolarized Ear Simulator according to IEC 60318-4 (60711) (2 pcs)

GRAS GR0010

1/2" to 1/4" Adapter

GRAS 26CS

1/4" CCP Preamplifier with Microdot connector, very short (2 pcs)

GRAS AA0018

3 m Microdot - BNC Cable, High Temp (2 pcs)

GRAS GR0408

Exterior Ear Canal (for calibration)

GRAS GR0409

Union Nut (for calibration)

 45CA-9 Headphone/Hearing-Protector Test Fixture, High Resolution with Anthropometric Pinnae, LEMO - for test of headphones and ear phones up to 20 kHz

GRAS KB5010

Large Right Anthropometric KEMAR Pinna 35 Shore OO

GRAS KB5011

Large Left Anthropometric KEMAR Pinna 35 Shore OO

GRAS GR1075

Pinna Holder Plate

GRAS RA0401

Externally Polarized High Resolution Ear Simulator (2 pcs)

GRAS GR0010

1/2" to 1/4" Adapter

GRAS 26AS

1/4" Standard Preamplifier with 3 m integrated cable, very short (2 pcs)

GRAS GR0408

Exterior Ear Canal (for calibration)

GRAS GR0409

Union Nut (for calibration)

 45CA-10 Headphone/Hearing-Protector Test Fixture, High Resolution with Anthropometric Pinnae, CCP  - for test of headphones and ear phones up to 20 kHz

GRAS KB5010

Large Right Anthropometric KEMAR Pinna 35 Shore OO

GRAS KB5011

Large Left Anthropometric KEMAR Pinna 35 Shore OO

GRAS GR1075

Pinna Holder Plate

GRAS RA0402

Prepolarized High Resolution Ear Simulator (2 pcs)

GRAS GR0010

1/2" to 1/4" Adapter

GRAS 26CS

1/4" CCP Preamplifier with Microdot connector, very short (2 pcs)

GRAS AA0018

3 m Microdot - BNC Cable, High Temp (2 pcs)

GRAS GR0408

Exterior Ear Canal (for calibration)

GRAS GR0409

Union Nut (for calibration)

Optional accessories

KEMAR Pinnae for configurations with using IEC 60318-4 Ear Simulator

GRAS RA0172

Pinna & Ear Simulator Mounting Kit (required to hold a pinna) Included with 45CA-5 and -6.

 

Note: Contains a cover plate, ear canal extension, screws and Allen key

GRAS KB0070

KEMAR Large Right Pinna Shore 55 Hearing Protector. Included with 45CA-5 and 6.

GRAS KB0071

KEMAR Large Left Pinna Shore 55 Hearing Protector. Included with 45CA-5 and 6.

GRAS KB1070

KEMAR Large Right Pinna Shore 35 Hearing Protector

GRAS KB1071

KEMAR Large Left Pinna Shore 35 Hearing Protector

GRAS KB0072

KEMAR Small Right Pinna Shore 55 Hearing Protector

GRAS KB0073

KEMAR Small Left Pinna Shore 55 Hearing Protector

GRAS KB5010

KEMAR Large Right Anthropometric Pinna for 45CA, Shore 35. Included with 45CA-7 and 8

GRAS KB5011

KEMAR Large Left Anthropometric Pinna for 45CA, Shore 35. Included with 45CA-7 and 8

 Cables for LEMO configurations 

GRAS AA0008

3 m LEMO 7-pin - LEMO 7-pin Cable

GRAS AA0009

10 m LEMO 7-pin - LEMO 7-pin Cable

GRAS AA0020-CL

Customized length LEMO 7-pin - LEMO 7-pin Cable (specify length in cm, e.g. -CL0500 for a 5 m cable)

 Cables for CCP configurations

GRAS AA0035

3 m BNC - BNC Cable

GRAS AA0037

10 m BNC - BNC Cable

GRAS AA0039-CL

Customized length BNC - BNC Cable (specify length in cm, e.g. -CL0500 for a 5 m cable)

GRAS AE0074

BNC – BNC adapter

 Power modules

GRAS 12AQ

For all configurations (dual channel LEMO/CCP)

GRAS 12AA

For externally polarized configurations only (dual channel)

GRAS 12AU

1-Channel Universal Power Module with signal conditioning and power amplifier

 Power Supply +15 VDC (provides +15 VDC power to the Power Module)

GRAS AB0002

Mains/line power supply, 230 VAC (EU mains connector)

GRAS AB0006

Mains/line power supply, 230 VAC (UK mains connector)

GRAS AB0003

Mains/line power supply, 120 VAC (US mains connector)

 Calibration Equipment

GRAS 42AP

Intelligent Pistonphone, Class 0

GRAS 42AA

Pistonphone, Class 1

GRAS RA0023

Coupler for 1" microphones (Note: RA0023 is included with 42AP but optional for 42AA)

GRAS RA0287

Calibration Adapter (for in-situ verification of RA0039)

GRAS RA0157

1/2'' Calibration Adapter for KEMAR Pinna (For the IEC60318-4 configuration only)

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

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