Low frequency range extends below the human audible range.
A new 1/2" microphone and preamplifier system, model 378A07 from PCB Piezotronics, Inc. aids in low frequency testing, ideal for studies ranging from wind turbines to natural events like tornadoes.
Low frequency measurements are commonly required for wind turbines, sonic booms, diesel engines and specialized loudspeaker systems to name a few. Natural events such as tornadoes and earthquakes emit very low frequency pressure waves which can travel long distances without being blocked. Model 378A07 microphones can detect these low frequency signatures as potential danger.
This free-field prepolarized microphone has a frequency range of 0.13 Hz to 20 kHz (+/- 2dB) which meets the IEC 61094-4 standard for test and measurement microphones. This covers infrasound which is below the normal hearing range for adults.
PCB® carries a full complement of prepolarized and externally polarized condenser microphones and preamplifiers. Prepolarized microphones use standard coaxial cables and are ICP® compliant, allowing power supplies to be shared with other ICP® compliant products such as accelerometers. This interchangeability can result in a significant per-channel cost savings as well as reduce test set-up time. The 378A07 microphone is A2LA and ILAC accredited. Like all PCB products, it comes with a "Total Customer Satisfaction" guarantee.