figure simliar  Pressure chamber secondary calibration of microphones according to IEC 61094-5  Pressure chamber secondary calibration of sound level meters and sound level measuring chains according to IEC 61672  True pressure chamber calibration with an acoustic coupler  Calibration of measuring microphones (1” capacitor and electrets microphones)  Supply of a sound pressure level for the calibration of sound level meters and measuring chains  Frequency range 31.5 Hz…8 kHz  Including Microphone holder fixture  Including High-End Power Amplifier Range of Use  Certified calibration laboratories  Departments of measuring instrument verification in research and industry, for example test laboratories in the automotive field or in the aviation and space industry  Quality assurance in manufacturing of microphones, sound level meters and dosimeters  On request: there is a solution for 1/2‘‘ microphones available: the SQ-4.2 electroacoustic coupler of SPEKTRA. Advantages  Wide frequency range 31.5 Hz…8 kHz  Low distortion, even at low frequencies  Symmetric very small pressure cham

SQ-4.1 Electro-Acoustic Coupler System components     SQ 4.1 active electro-acoustic coupler High-End Power amplifier S.M.S.L sAp-8, including power plug and plug adapter Microphone holder fixture System cable Optional reference standards (recommended):  1” condenser microphone cartridge type LS1P or WS1P with amplifier Sound field: Pressure chamber Frequency range: Maximum electrical power of the sound source: Diameter of Microphones Maximum sound pressure level: ( * only temporary peak value, depending on frequency range) Typical measurement uncertainty of a microphone calibration with...