Measurement microphones are available in many types covering various frequency ranges, dynamic ranges and application situations.
Manufactures state-of-the-art measurement microphones and related equipment to industries where acoustic measuring accuracy and repeatability is of utmost importance.
Externally Polarized Microphones:
These microphones are used with standard preamplifiers, which has a 7-pin LEMO connector. The preamplifier must be connected to a power module or an analyzer input which can supply the preamplifier with power as well as 200 V polarization. If you conduct very critical measurements we recommend an externally polarized microphone which is the most accurate and stable.
Link to GRAS Website: Microphone sets with traditional power supply (LEMO)
These microphones are used typically with CCP (Constant Current Power) preamplifiers. Prepolarized microphones must be connected to an input stage for CCP transducers or be powered by a CCP supply.
Link to GRAS Website: Microphone sets with constant current power (CCP)