G.R.A.S. 46AP 1/2" LEMO Pressure Standard Microphone Set, High Sensitivity

Freq range: 3.15 Hz to 10 kHz
Dyn range: 18 dB(A) to 149 dB
Sensitivity: 50 mV/Pa

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 application and use

The 46AP is a pressure microphone set and as such optimized for acoustic measurements of the sound source in a closed coupler or the measurement of sound pressure at a boundary or wall; in which case the microphone forms part of the wall and measures the sound pressure on the wall itself.

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. 46AP 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. 40AP 1/2" Ext. Polarized Pressure Microphone, High Sensitivity, designed for long-term reliability in multiple environments.

Preamplifier
The preamplifier is the G.R.A.S. 26TK 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.

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 with G.R.A.S. preamplifier dB(A) 18
Dynamic range upper limit with G.R.A.S. preamplifier @ +28 V / ±14 V power supply dB 142
Dynamic range upper limit with G.R.A.S. preamplifier @ +120 V / ±60 V power supply dB 149
Set sensitivity @ 250 Hz (±2 dB) mV/Pa 50
Set sensitivity @ 250 Hz (±2 dB) dB re 1V/Pa -26
Output impedance Ω 75
Power supply min. to max. (single/balanced) V 28 to 120 / ± 14 to ± 60
DC-offset, min., single suppy V 0.5 x Vs - 1
DC-offset, max., single suppy V 0.5 x Vs + 4
DC-offset, balanced supply V -1 to 4
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 -0.008
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
TEDS UTID (IEEE 1451.4) 27 v. 1.0
Connector type 3 m 7-pin LEMO
CE/RoHS compliant/WEEE registered Yes / Yes/Yes
Weight g / oz 42 / 1.482

Typical frequency response

Free-field corrections for different angles of incidence

Optional items

G.R.A.S. AA0008

3 m LEMO 7-pin - LEMO 7-pin Cable

G.R.A.S. AA0020-CL

Customized Length LEMO 7-pin - LEMO 7-pin 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

Rain-protection cap for 1/2” microphones

G.R.A.S. 12AA

2-Channel Power Module with gain, filters and SysCheck generator

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