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GRAS 46AD 1/2" CCP Pressure Standard Microphone Set, HighSensitivity

Freq range: 3.15 Hz to 10 kHz
Dyn range: 18 dB(A) to 138 dB
Sensitivity: 50 mV/Pa

TechnologyIntroduction

The 46AD is a pressure microphone set and as such optimized foracoustic measurements of the sound source in a closed coupler orthe measurement of sound pressure at a boundary or wall; in whichcase the microphone forms part of the wall and measures the soundpressure on the wall itself.

The medium frequency range makes it ideal for general acousticdiagnostics.

Regarding temperature range, see the Specifications. Shouldhigher temperature limits be required, we recommendconsidering  the GRAS probe microphones where the microphoneand preamplifier can be isolated from the hot source.

A front-vented version is available, 46AD-FV 1/2" CCP PressureStandard Microphone Set, Front Vented.

Design

The GRAS 46AD is a high-performance standard microphone set. Inour clean-room environment the set is assembled and sealed with alabel. However, the microphone set can be dismounted, if you wishto use the components separately.

Microphone
The microphone cartridge is the high-quality IEC  61094 WS2Pstandardized GRAS 40AD 1/2" Prepolarized PressureMicrophone, High Sensitivity, designed for long-term reliability inmultiple environments.

Preamplifier
The preamplifier is the GRAS 26CA Preamplifier which isinclusive TEDS and based on our well-known circuit boardsubstrates. In the industry these are famous for their lowself-noise, wide frequency and excellent slew rate performance.

Compatibility

To perform as specified, the GRAS 46AD 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. Cableswith BNC connectors of various types and lengths are availablein standard as well as customized lengths.

The 46AD is IEEE 1451.4 TEDS v. 1.0 compliant. If yourmeasurement platform supports Transducer Electronic Data Sheets youwill be able to read and write data like properties and calibrationdata.

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.

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.

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.

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.

Specifications

Frequency range (±1 dB)

Hz

12.5 to 7.5 k

Frequency range (±2 dB)

3.15 to 10 k

Dynamic range lower limit with GRAS preamplifier

dB(A)

18

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

Power supply min. to max. (single/balanced)

V

N/A

DC bias voltage, typ.

12

Microphone venting

Rear (Front on request)

IEC 61094-4 Compliance

WS2P

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

-0.01

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

62

TEDS UTID (IEEE 1451.4)

27 v. 1.0

Connector type

BNC

CE/RoHS compliant/WEEE registered

Yes/Yes/Yes

Weight

g / oz

33 / 1.164

 

Typical frequency response

Free-field corrections for different angles of incidence

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

DimensionsOrdering info

GRAS 46AD

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

GRAS 46AD-FV

1/2" CCP Pressure Standard Microphone Set, Front Vented. Thisone is identical to 46AD, but has 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 changespecifications and accessories without notice.