G.R.A.S. 46AO 1/2'' CCP Pressure Standard Microphone Set

Freq range: 3.15 Hz to 20 kHz
Dyn range: 25 dB(A) to 150 dB
Sensitivity: 12 mV/Pa
  • 46AO 1/2'' Pressure Set

Introduction

Through a close cooperation with our customers, we know that data-safety is highly important because the costs related to unsuited and unreliable sensors may determine whether your project turns into a success or not.

For our users, data safety translates directly into requests for easier microphone selection, simple system configuration and reduction of measurement errors.

To meet these requirements, we invented the microphone set concept. It is simple, reliable and robust and consists of a microphone cartridge and preamplifier combination, which is calibrated as one unit. This eliminates errors because there is only one sensitivity value to account for and the risk of contaminating the interface is eliminated. Combine this with our unique and proven design and you have the most reliable measurement microphone sets available in the industry today.

Typical applications and use

The 46AO is a high-precision microphone suitable for laboratory work.

Regarding temperature range, see the Specifications. Should higher temperature limits be required, we recommend considering  the G.R.A.S. probe microphones where the microphone and preamplifier can be isolated from the hot source.

Design

The G.R.A.S. 46AO is a high-performance standard microphone set. In our clean-room environment the set is assembled and sealed with a label. However, the microphone set can be dismounted, if you wish to use the components separately.

Microphone
The microphone cartridge is the high-quality IEC  61094 WS2P standardized G.R.A.S. 40AO 1/2" Prepolarized Pressure Microphone, designed for long-term reliability in multiple environments.

Preamplifier
The preamplifier is the G.R.A.S. 26CA Preamplifier which is inclusive TEDS and based on our wellknown circuit board substrates. In the industry these are famous for their low self-noise, wide frequency and excellent slew rate performance.

Compatibility

The 46AO uses BNC connector, which requires an input module that supports this technology.

For more information, see System Setup.

System verification

For daily verification and check of your measurement setup, we recommend using a calibrator like G.R.A.S. Sound Level Calibrator 42AB

For proper sensitivity calibration, we recommend using a pistonphone like G.R.A.S. Intelligent Pistonphone 42AP

Quality and warranty

All G.R.A.S. microphone sets are made of high-quality materials that will ensure life-long stability and robustness. The microphone sets 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 G.R.A.S. to offer 5 years warranty against defective materials and workmanship.

Learn more about G.R.A.S.' unique warranty policies.

Service

If you accidentally damage the diaphragm on a G.R.A.S. 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.

Learn more about G.R.A.S.' service program.

Calibration

Before leaving the factory, all G.R.A.S. microphone sets are calibrated as a unit in a controlled laboratory environment using traceable calibration equipment. The sets are delivered with calibration charts including sensitivity values and frequency response graphs for the complete set. You can use the sensitivity value directly in your system setup.

Depending on the use, measurement environment, and internal quality control programs, we recommend recalibrating the microphone set at least every second year.

Learn more about G.R.A.S.' calibration services.

Frequency range (±1 dB) Hz 5 to 12.5 k
Frequency range (±2 dB) Hz 3.15 to 20 k
Dynamic range lower limit with G.R.A.S. preamplifier dB(A) 25
Dynamic range upper limit with G.R.A.S. CCP preamplifier dB 150
Set sensitivity @ 250 Hz (±3 dB) mV/Pa 12
Set sensitivity @ 250 Hz (±3 dB) dB re 1V/Pa -38.5
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 (Front on request)
IEC 61094-4 Compliance WS2P
Temperature range, operation °C / °F -30 to 70 / -22 to 158
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 -0.007
Humidity range non condensing % RH 0 to 95
Humidity coefficient @250 Hz dB/% RH -0.001
Influence of axial vibration @1 m/s² dB re 20 µPa 66
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

 Optional items

G.R.A.S. AA0035

3 m BNC - BNC Cable

G.R.A.S. AA0039-CL

Customized length BNC - BNC Cable

G.R.A.S. AL0008

1/2" Microphone Holder, POM

G.R.A.S. AL0012

1/2" Microphone Holder, Stainless Steel

G.R.A.S. AL0005

Swivel head

G.R.A.S. AL0006

Tripod

G.R.A.S. RA0020

1/2" Nosecone

G.R.A.S. AM0069

Windscreen for 1/2" Microphones

G.R.A.S. RA0131

1/2'' Rain protection cap

G.R.A.S. 12AL

1-Channel CCP Power Module with A-weighting filter

G.R.A.S. 12AQ

2-Channel Universal Power Module with signal conditioning and PC interface

G.R.A.S. 42AB

Sound Calibrator, Class 1

G.R.A.S. 42AP

Intelligent Pistonphone, Class 0