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 46DD 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.
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.
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.
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.
|Frequency range (±1 dB)||Hz||10 to 30 k|
|Frequency range (±2 dB)||Hz||6.5 to 70 k|
|Dynamic range lower limit with G.R.A.S. preamplifier||dB(A)||47|
|Dynamic range upper limit with G.R.A.S. CCP preamplifier||dB||175|
|Set sensitivity @ 250 Hz (±3 dB)||mV/Pa||0.62|
|Set sensitivity @ 250 Hz (±3 dB)||dB re 1V/Pa||-64|
|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|
|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||-0.014|
|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||59|
|TEDS UTID (IEEE 1451.4)||27 v. 1.0|
|Connector type||Microdot 10/32|
|CE/RoHS compliant/WEEE registered||Yes / Yes/Yes|
|Weight||g / oz||7 / 0.247|
Typical frequency response (without protection grid).
3 m Microdot - BNC Cable
|Customized Length Microdot - BNC Cable|
|Customized Length Microdot - Microdot Cable|
1/4" Microphone Holder, POM
1/4" Microphone Holder, Stainless Steel
Windscreen for 1/4" Microphones
1-Channel CCP Power Module with A-weighting filter
2-Channel Universal Power Module with signal conditioning and PC interface
Sound Calibrator, Class 1
Intelligent Pistonphone, Class 0