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.
|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|
|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|
|IEC 61094-4 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).
Pistonphone, Class 1
Intelligent Pistonphone, Class 0
2-Channel LEMO Power Module with gain, filters and Syscheck generator
1-Channel Power Module with gain, filters and SysCheck generator
2-Channel Universal Power Module with signal conditioning and PC interface