CS18 FF Calibration System Free Field  Secondary calibration of measuring microphones, sound level meters and other acoustic sensors according to IEC 61094-8 and IEC 61672  Periodic single qualification according to IEC 61672-3  Acoustical measurements like: - Measurement of directivity characteristic - Determination of diffuse-field sensitivity - Measurement of acoustic emission of small objects  Calibration of constructively mechanically nonstandard microphones, e.g. external microphone units, optionally in axial and radial direction of measurement  Reference standards traceable to Physikalisch Technische Bundesanstalt (PTB) Braunschweig by the SPEKTRA Calibration Laboratory D-K-15183-01-00 (DAkkS-calibration certificate)  True free-field calibration in acoustically dead (anechoic) chamber  Calibration of any measuring microphone (condenser, electrets, electro-dynamic etc.) with any conctruction with / without protection grid  Supply of a defined free-field sound pressure level for the calibration of sound level meters  Calibration of acoustic calibrators  Can be combined with the following SPEKTRA calibration systems, e.g.:  CS18 SPL (calibration system pressure chamber)  CS18 SPL-E (calibration system pressure chamber for dosimeter)  CS18 SPL-VLF (calibration system sound pressure level very low frequency) Range of Use  Certified calibration laboratories  Measuring instrument verification in research and industry, for example civil engineering, aviation and automotive engineering  Quality assurance in manufacturing of microphones and sound level meters

CS18 FF Calibration System Free Field Components:  Dedicated transportable acoustically dead (anechoic) chamber by SPEKTRA, completely lined with wedge-shaped absorbers, with loudspeaker, for alternately holding the reference standard and test object, with small window for reading off the indications of compact sound level meters without electrical output channel  Vibration control system SRS-35 by SPEKTRA  Software CS18 FF with corresponding operation modes  Power amplifier PA 14-180 by SPEKTRA  Boom (holder fixture for DUT’s), accessories, cables and standard-PC  Reference standards -...