G.R.A.S. 40EU 1" Ext. Polarized Reference Pressure Microphone

Product catalog summary

Introduction
The G.R.A.S. 40EU is a 1" externally polarized reference pressure microphone, compliant with IEC 61094 LS1P standards. It is designed for precision measurements in couplers for earphone testing and can measure sound pressures at boundaries when flush-mounted. It is factory-calibrated and suitable as a laboratory-standard microphone.

Specifications
- Sensitivity: 50 mV/Pa
- Frequency Response: 2.6 Hz to 8 kHz
- Dynamic Range: 9.6 dBA to 146 dB
- Temperature Range: -40 to 150°C (-40 to 302°F) for operation
- Humidity Range: 0 to 100% RH non-condensing
- Weight: 32 g (1.129 oz)

Applications
The 40EU is ideal for precision reciprocity calibrations due to its linear reversible transducer properties. It is also suitable for secondary calibration of working-standard microphones.

Compatibility
The microphone requires a standardized ½" LEMO preamplifier and an input module with a 7-pin LEMO connector.

Quality and Warranty
G.R.A.S. microphones are made from high-quality materials, ensuring durability and resistance to corrosion. They offer a 5-year warranty against defects. The microphones are assembled in clean-room environments.

Service and Calibration
G.R.A.S. offers diaphragm replacement services and recommends annual recalibration of microphones. Calibration is performed using traceable equipment.

Company Background
Founded by Gunnar Rasmussen, G.R.A.S. has been dedicated to developing high-quality measurement microphones since 1994. The company is known for its innovation in acoustic sensors and is represented in over 40 countries.

Conclusion
The G.R.A.S. 40EU microphone is a robust and reliable choice for precise acoustic measurements, backed by a strong warranty and global support network.

Catalog excerpts

G.R.A.S. 40EU 1" Ext. Polarized Reference Pressure Microphone-1

G.R.A.S. 40EU 1" Ext. Polarized Reference Pressure Microphone Date 10-06-2013. Page 1 of 5 G.R.A.S. 40EU 1" Ext. Polarized Reference Pressure Microphone Sensitivity: 50 mV/Pa Freq resp: 2.6 Hz to 8 kHz Dynamic range: 9.6 dBA to 146 dB The 40EU is an IEC 61094 LS1P 1” externally polarized pressure microphone that is rear-vented. It is a 1” pressure microphone that is ideal for measurements in couplers used for testing earphones. When flush-mounted, it can measure sound pressures at boundaries. It is highly suited as a laboratory-standard microphone. Introduction The 40EU is an IEC 61094 LS1P 1" externally polarized pressure microphone that is rear-vented. It is a 1" pressure microphone that is ideal for measurements in couplers used for testing earphones. When flush-mounted, it can measure sound pressures at boundaries. It is highly suited as a laboratory-standard microphone. 40EU is individually factory-calibrated and delivered with a calibration chart stating its specific open-circuit sensitivity and pressure frequency response.

Open the catalog to page 1

G.R.A.S. 40EU 1" Ext. Polarized Reference Pressure Microphone-2

G.R.A.S. 40EU 1" Ext. Polarized Reference Pressure Microphone Date 10-06-2013. Page 2 of 5 40EU can be used in precision reciprocity calibrations because it is a linear reversible transducer. This means that the electrical energy emitted by the 40EU is strictly or linearly proportional to the acoustical energy it receives. This is exactly what is required for such calibrations. When carefully handled, the 40EU can retain its calibrated properties for many centuries. The 40EU is also highly suited as a laboratory reference for secondary calibration of working-standard microphones. Compatibility...

Open the catalog to page 2

G.R.A.S. 40EU 1" Ext. Polarized Reference Pressure Microphone-3

G.R.A.S. 40EU 1" Ext. Polarized Reference Pressure Microphone Date 10-06-2013. Page 3 of 5 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. Learn more about G.R.A.S.' calibration services. Specification Open-circuit sensitivity @ 250 Hz (±2 dB) Resonance frequency Dynamic range lower limit (microphone thermal noise) Dynamic range upper limit Dynamic lower limit with G.R.A.S. preamplifier Dynamic range upper limit with G.R.A.S. preamplifier @ ±14 V / +28 V...

Open the catalog to page 3

G.R.A.S. 40EU 1" Ext. Polarized Reference Pressure Microphone-4

G.R.A.S. 40EU 1" Ext. Polarized Reference Pressure Microphone Date 10-06-2013. Page 4 of 5 Humidity coefficient @250 Hz Influence of axial vibration @1 m/s² CE/RoHS compliant, WEEE registered Weight

Open the catalog to page 4

G.R.A.S. 40EU 1" Ext. Polarized Reference Pressure Microphone-5

G.R.A.S. 40EU 1" Ext. Polarized Reference Pressure Microphone Date 10-06-2013. Page 5 of 5 Tradition Since the establishment in 1994, G.R.A.S. have been 100% dedicated to developing and manufacturing high-quality measurement microphones and related acoustic equipment. Founded by the Danish acoustics pioneer Gunnar Rasmussen who for more than 60 years has contributed to the world of sound and vibration with his unique ideas and designs. From the first reproducible 1” condenser measurement microphone that enabled quality measurements and instrumentation for acoustic calibration, Mr. Rasmussen’s...

Open the catalog to page 5