GRAS 40AP-FV 1/2" Ext. Polarized Pressure Microphone, High Sensitivity, Front Vented

Freq range: 3.15 Hz to 10 kHz
Dyn range: 16 dBA to 149 dB
Sensitivity: 50 mV/Pa

Technology

Introduction

The 40AP-FV is an IEC 61094 WS2P ½" externally polarized pressure microphone with front venting.

It is a high-precision condenser microphone made according to IEC 61094-4 requirements and is ideal for coupler and boundary measurements in both laboratory and production environments. It is extremely robust and reliable and can measure sound pressure levels up to 160 dB within 3.15 Hz to 20 kHz. Because of its high sensitivity, it can also measure sound pressure levels down to 16 dB(A). If needed, the 40AP can also be used as a random-incidence microphone.

40AP-FV is individually factory-calibrated and delivered with a calibration chart stating its specific open-circuit sensitivity and pressure frequency response.

Typical applications and use

The 40AP-FV is especially suited for audiometer calibration when using a sound level meter / analyzer with a 200 V polarization feature.

It is used for production line testing in coupler setups for test of hearing aids, earphones, headphones, and headsets.

Compatibility

The 40AP-FV requires a standardized ½" or ¼" LEMO preamplifier and an input module that supports this technology with a 7-pin LEMO connector.

System verification

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

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

Quality and warranty

All GRAS microphones are made of high-quality materials that will ensure life-long stability and robustness. The microphones are all assembled in verified clean-room environments by skilled and dedicated operators with many years of expertise in this field.

The microphone diaphragm, body, and improved protection grid are made of high-grade stainless steel, which makes the microphone resistant to physical damage, as well as corrosion caused by aggressive air or gasses.

This, combined with the reinforced gold-plated microphone terminal which guarantees a highly reliable connection, enables GRAS to offer 5 years warranty against defective materials and workmanship.

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.

Specifications

Coupler volume
mm³
0.4 ccm
Frequency range (±1 dB)
Hz
12.5 to 7.5 k
Frequency range (±2 dB)
Hz
3.15 to 10 k
Dynamic range lower limit (microphone thermal noise)
dB(A)
16
Dynamic range lower limit with GRAS preamplifier
dB(A)
18
Dynamic range upper limit
dB
149
Dynamic range upper limit with GRAS preamplifier @ +28 V / ±14 V power supply
dB
142
Dynamic range upper limit with GRAS preamplifier @ +120 V / ±60 V power supply
dB
149
Open-circuit sensitivity @ 250 Hz (±1 dB)
mV/Pa
50
Open-circuit sensitivity @ 250 Hz (±1 dB)
dB re 1V/Pa
-26
Resonance frequency
kHz
8
Microphone cartridge capacitance, typ.
pF
20
Microphone venting
Front
IEC 61094-4 Compliance
WS2P
Temperature range, operation
°C / °F
-40 to 150 / -40 to 302
Temperature range, storage
°C / °F
-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
-0.008
Humidity range non condensing
% RH
0 to 100
Humidity coefficient @250 Hz
dB/% RH
-0.001
Influence of axial vibration @1 m/s²
dB re 20 µPa
62
CE/RoHS compliant/WEEE registered
Yes / Yes, Yes
Weight
g / oz
9 / 0.317
Specification Conditions

Typical frequency response.

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

Dimensions

Ordering info

Optional items

GRAS AF0008

Adapter for ¼” preamplifier and ½” microphone

GRAS GR0010

Adapter for ¼” preamplifier and ½” microphone

GRAS RA0001

Right-angled (90°) adapter for ½” microphone and ¼” preamplifier

GRAS RA0003

Adapter for ¼” preamplifier and ½” microphone

GRAS RA0016

20 dB Attenuator for externally polarized ½” microphones

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

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