G.R.A.S. 67BX ø40 cm CCP Ground Array Microphone Kit, High Pressure

Freq range: 3.15 Hz to 20 kHz
Dyn range: 22 dB(A) to 166 dB
Sensitivity: 1.6 mV/Pa
G.R.A.S. 67BX ø40 cm CCP Ground Array Microphone Kit, High Pressure

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.

Learn more about G.R.A.S.' unique warranty policies.

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.

Learn more about G.R.A.S. service program.

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.

Learn more about G.R.A.S.' calibration services.

Frequency range (±1 dB) Hz 5 to 12.5 k
Frequency range (±2 dB) Hz 3.15 to 20 k
Dynamic range lower limit (microphone thermal noise) dB(A) 22
Dynamic range upper limit with G.R.A.S. CCP preamplifier dB 166
Set sensitivity @ 250 Hz (±2 dB) mV/Pa 1.6
Polarization voltage V 0
Power supply (Constant Current Power) mA 2 to 20
Microphone venting Rear
Output impedance Ω <50
Temperature range, operation °C / °F -30 to 70 / -22 to 158
Temperature range, storage °C / °F -40 to 85 / -40 to 185
Static pressure coefficient @250 Hz dB/kPa - 0.008
Humidity range non condensing % RH 0 to 100
Humidity coefficient @250 Hz dB/% RH <0.1
Influence of magnetic field @80 A/m, 50 Hz dB re 20 µPa 66
TEDS UTID (IEEE 1451.4) 27 v. 1.0
Connector type BNC
CE/RoHS compliant/WEEE registered Yes/Yes/Yes
Weight g / oz 15 / 0.529