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GRAS 46AE 1/2'' CCP Free-field Standard Microphone Set

Freq range: 3.15 Hz to 20 kHz
Dyn range: 17 dB(A) to 138 dB
Sensitivity: 50 mV/Pa
IEC 61672 Class 1
Use: For general acoustic diagnostics

The 46AE is a free-field microphone set and as suchoptimized for all acoustic applications, where the location of themain sound source is known and the microphone can be pointeddirectly at it ensuring 0° incidence.

TechnologyIntroduction

The 46AE is a free-field microphone set and as such optimizedfor all acoustic applications, where the location of the main soundsource is known and the microphone can be pointed directly at itensuring 0° incidence.

The medium frequency range makes it ideal for general acousticdiagnostics. 46AE conforms with IEC  61094 WS2F and IEC 61672Class 1.

Regarding temperature range, see the Specifications. Shouldhigher temperature limits be required, we recommend the GRAS 146AE 1/2" CCP Free-field Rugged Microphone Setwhich can be used up to 125 °C.

A front-vented version is available, 46AE-FV 1/2" CCPFree-field Front Vented Microphone Set.

Design

The GRAS 46AE is a high-performance 1/2” free-field standardmicrophone set for measuring medium sound pressure levels at mediumfrequencies. In our clean-room environment the set is assembled andsealed with a label. However, the microphone set can bedismounted, if  you wish to use the componentsseparately.

Microphone
The microphone cartridge is the high-quality IEC 61094 WS2Fstandardized GRAS 40AE 1/2" Prepolarized Free-FieldMicrophone, designed for long-term reliability in multipleenvironments. The high sensitivity and reliability has made 40AEthe preferred measurement microphone for sound levelmeters/analyzers with CCP-option and, as such, enables IEC 61672Class 1 measurements.

The prepolarization is obtained through an electret that isinflicted on the microphone back-plate under highly controlledconditions. The electret is then charged to match the specifiedmicrophone sensitivity.

Preamplifier
The preamplifier is the GRAS 26CA 1/2" CCP StandardPreamplifier with BNC connector, and based on our well-knowncircuit board substrates. In the industry these are famous fortheir low self-noise, wide frequency and excellent slew rateperformance.

Compatibility

To perform as specified the GRAS 46AE microphone set requires aconstant current input module that can deliver 4 mA and 24 Vunloaded CCP voltage supply. If the constant current supply islower, the capability of driving long cables is reduced andconsequently the upper frequency is reduced. If the voltage supplyis lower it will influence the upper dynamic range.

The microphone set is terminated with a  BNC connector.Ready to use coax cable assemblies of various types and lengths areavailable in standard as well as customized lengths.

The 46AE is delivered with Generation II TEDS. The calibrationdata is programmed into the built-in TEDS according to IEEE 1451.4using UDID I27-0-0-0U. If your measurement platform supportsTransducer Electronic Data Sheets you will be able to read andwrite data like properties and calibration data.

Generation II TEDS chip (DS2431) may require updated systemsoftware.

System verification

The functionality of TEDS is very useful to determine whichmicrophone is connected to which input channel. However, it is nota check of whether the microphone is within specifications or not.For daily verification and check of your measurement setup, wetherefore recommend using a sound source like the GRAS42AG Sound Calibrator.

For proper sensitivity calibration we recommend using areference sound source like the GRAS 42AP IntelligentPistonphone.

Calibration

When leaving the factory, all GRAS microphones have beencalibrated in a controlled laboratory environment using traceablecalibration equipment. Depending on the use, measurementenvironment and internal quality control programs we recommend thatthe microphone is recalibrated at least once a year.

We offer two kinds of calibration as an optional after-salesservice: GRAS Traceable Calibration and GRAS AccreditedCalibration.

GRAS Traceable Calibration is a traceable calibration performedby trained personnel under controlled conditions according toestablished procedures and standards. This is identical to therigorous calibration that all GRAS microphones are subjected to asan integral part of our quality assurance.

GRAS Accredited Calibration is performed by the GRAS AccreditedCalibration Laboratory that has been accredited in accordance withISO 17025 by DANAK, the Danish Accreditation Fund.

If you want a new microphone set delivered with an accreditedcalibration in stead of the default factory calibration, specifythis when ordering.

Learn more at gras/calib.

GRAS HALT

When our R&D team develops a measurement microphone, it mustundergo the most demanding tests to prove that it can withstand ourcustomers' daily test conditions. Using a series of HighlyAccelerated Lifetime Tests (HALT) we ensure that our microphoneslive up to the high quality and precision that our customers havecome to expect and trust. Our HALT tests actively accelerate thelifetime of a microphone by simulating the handling and use it isexposed to in real life situations.

For more about HALT, see http://www.gras.dk/halt.

Quality and warranty

GRAS microphone sets are made of components from our provenstandard portfolio and are all manufactured of high-qualitymaterial and branded parts that were chosen and processed to ensurelife-long stability and robustness.

All parts are manufactured and assembled at the factory inDenmark by skilled and dedicated operators in a verified clean-roomenvironment. The microphone diaphragm, body and unique protectiongrid are made of high-grade stainless steel and make the microphoneset resistant to physical damage as well as corrosion caused byaggressive air or gasses.

This, together with the enforced gold-plated microphone terminalguarantees a highly reliable connection. Thanks to the highquality, our warranty against defective materials and workmanshipis 5 years.

Service

Should you by mistake damage the diaphragm on a GRAS microphonewe will in most cases be able to exchange it at a very reasonablecost and short turn-around time. This not only protects yourinvestment but also meets your quality assurance department sinceyou do not have to worry about new serial numbers etc.

Specifications

Frequency range (±1 dB)

Hz

5 to 10 k

Frequency range (±2 dB)

3.15 to 20 k

Dynamic range lower limit with GRAS preamplifier

dB(A)

17

Dynamic range upper limit with GRAS CCP preamplifier

dB

138

Set sensitivity @ 250 Hz (±2 dB)

mV/Pa

50

dB re 1V/Pa

-26

Output impedance

Ω

< 50

Output Voltage Swing, min. @ 24-28 V CCP voltage supply

Vp

8

Power supply min. to max.

mA

2 to 20

DC bias voltage, typ.

V

12

Microphone venting

Rear

IEC 61094-4 Compliance

WS2F

Temperature range, operation

°C / °F

-30 to 85 / -22 to 185*

Temperature range, storage

-40 to 85 / -40 to 185

Temperature coefficient @250 Hz

dB/°C / dB/°F

-0.01 / -0.006

Static pressure coefficient @250 Hz

dB/kPa

-0.007

Humidity range non condensing

% RH

0 to 90

Humidity coefficient @250 Hz

dB/% RH

-0.001

Influence of axial vibration @1 m/s²

dB re 20 µPa

66

TEDS UDID (IEEE 1451.4)

I27-0-0-0U

Connector type

BNC

CE/RoHS compliant/WEEE registered

Yes/Yes/Yes

Weight

g / oz

33 / 1.164

 *If used at temperatures higher than 70 °C, use hightemperature cables.

GRAS HALT Test Parameters**

Humidity 90%

@50°C48 hours

Drop - horizontal orientation of microphone, attached to 2 kgload

m1

Drop - vertical, grid downwards

m1

Vibration - horizontal and vertical

@8g15 hours

**For a short introduction to HALT, see the section "GRAS HALT"above

 

Test conditions

Temperature: 20 °C
Pressure: 760mm

Typical frequency response. Upper curve shows free-fieldresponse for 0°, lower curve shows pressure response.

Free-field corrections for different angles of incidence

GRAS Sound & Vibration reserves the right to changespecifications without notice.

DimensionsOrdering info

GRAS 46AE

1/2" CCP Pressure Standard Microphone Set. This is the"standard" rear vented version.

GRAS 46AE-FV

1/2" CCP Pressure Standard Microphone Set, Front Vented.Identical to 46AE, but with front venting.

 Optional itemsGRAS AA0035

3 m BNC - BNC Cable

GRAS AA0039-CL

Customized length BNC - BNC Cable

GRAS AL0008

1/2" Microphone Holder, POM

GRAS AL0012

1/2" Microphone Holder, Stainless Steel

GRAS AL0005

Swivel head

GRAS AL0006

Tripod

GRAS RA0020

1/2" Nosecone

GRAS AM0069

Windscreen for 1/2" Microphones

GRAS RA0131

1/2'' Rain protection cap

GRAS 12AL

1-Channel CCP Power Module with A-weighting filter

GRAS 12AQ

2-Channel Universal Power Module with signal conditioning and PCinterface

GRAS 42AG

Multifunction Sound Calibrator, Class 1

GRAS 42AP

Intelligent Pistonphone, Class 0

GRAS CA0029

Traceable Calibration of Microphone Set

GRAS CA2301

Accredited Calibration of Microphone Set

GRAS Sound & Vibration reserves the right to change accessorieswithout notice.