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GRAS 46AE 1/2'' CCP Free-field Standard Microphone SetFreq 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.
TechnologyIntroductionThe 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.
DesignThe GRAS 46AE is a high-performance 1/2” free-field standardmicrophone set for measuring medium sound pressure levels at mediumfre 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- 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.
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 andconse 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 verificationThe 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.
CalibrationWhen leaving the factory, all GRAS microphones have beencalibrated in a controlled laboratory environment using traceablecalibration e Depending on the use, measurementenvironment and internal 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 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 HALTWhen 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 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.
and warranty
GRAS microphone sets are made of components from our provenstandard portfolio and are all manufactured of high-material 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 high, our warranty against defective materials and workmanshipis 5 years.
ServiceShould 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 assurance department sinceyou do not have to worry about new serial numbers etc.
SpecificationsFrequency 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 hoursDrop - horizontal orientation of microphone, attached to 2 kgload
m1Drop - vertical, grid downwards
m1Vibration - 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 infoGRAS 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 AA00353 m BNC - BNC Cable
GRAS AA0039-CLCustomized length BNC - BNC Cable
GRAS AL00081/2" Microphone Holder, POM
GRAS AL00121/2" Microphone Holder, Stainless Steel
GRAS AL0005Swivel head
GRAS AL0006Tripod
GRAS RA00201/2" Nosecone
GRAS AM0069Windscreen for 1/2" Microphones
GRAS RA01311/2'' Rain protection cap
GRAS 12AL1-Channel CCP Power Module with A-weighting filter
GRAS 12AQ2-Channel Universal Power Module with signal conditioning and PCinterface
GRAS 42AGMultifunction Sound Calibrator, Class 1
GRAS 42APIntelligent 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.