G.R.A.S. 46BH 1/4" LEMO Pressure Standard Microphone Set, High pressure

Freq range: 10 Hz to 20 kHz
Dyn range: 54 dB(A) to 193 dB
Sensitivity: 0.4 mV/Pa

Quality and warranty

All G.R.A.S. 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 G.R.A.S. to offer 5 years warranty against defective materials and workmanship.

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.

Calibration 

Before leaving the factory, all G.R.A.S. 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.

TYPE (Microphone features) P
Frequency range (±2 dB) Hz 10 to 20 k
Dynamic range lower limit with G.R.A.S. preamplifier dB(A) 54
Dynamic range upper limit with G.R.A.S. preamplifier @ +28 V / ±14 V power supply dB 181
Dynamic range upper limit with G.R.A.S. preamplifier @ +120 V / ±60 V power supply dB 193
Set sensitivity @ 250 Hz (±1 dB) mV/Pa 0.4
Set sensitivity @ 250 Hz (±1 dB) dB re 1V/Pa -68
Output impedance Ω 75
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
IEC 61094 Compliance WS3P
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
Humidity range non condensing % RH 0 to 100
Humidity coefficient @250 Hz dB/% RH -0.001
TEDS UTID (IEEE 1451.4 ) 27 v. 1.0
Connector type 7-pin LEMO (FGG.1B.307)
CE/RoHS compliant/WEEE registered Yes / Yes, Yes

Typical frequency response (without protection grid).

Optional items

G.R.A.S. 42AA

Pistonphone, Class 1

G.R.A.S. 42AP

Intelligent Pistonphone, Class 0

G.R.A.S. 12AA

2-Channel LEMO Power Module with gain, filters and Syscheck generator

G.R.A.S. 12AK

1-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