The Endevco microphone model EM40DD is a 1/8-inch pressure microphone with a wide frequency response (see Fig.1) and a large dynamic range. Its tiny physical size reduces to a minimum the effects of diffractions and reflections created by its presence in the sound field. This allows it to be used for measuring veryhigh frequency sounds without disturbing the sound field. Its low sensitivity makes it ideal for high-level measurements. This, combined with its wide frequency response, make it also well suited for impulse-noise measurements. The model EM40DD must be used with an adapter for mounting 1/8-inch microphones onto ¼-inch preamplifiers. The Endevco ¼-inch Isotron® preamplifier model EM26CB (see separate data sheet) is available for use with the model EM40DD when fitted with an adapter. The mounting thread (5.7 mm - 60 UNS-2) is compatible with other available makes of similar microphone preamplifiers. Non-corrosive, stainless materials are used in manufacturing these microphones to enable them to withstand rough handling and corrosive environments. All Endevco microphones are guaranteed for 5 years and are individually checked and calibrated before leaving the factory. An individual calibration chart is supplied with each microphone. Typical applications • Sound-pressure measurements • High-frequency measurements • Very high level pressure measurements • Impulse-noise measurements • Repairable Endevco® model EM40DD 1/8” Prepolarized pressure microphone Description cmyk

Endevco® model EM40DD 1/8” Prepolarized pressure microphone APPLIES TO CALIFORNIA FACILITY Continued product improvement necessitates that Endevco reserve the right to modify these specifications without notice. Endevco maintains a program of constant surveillance over all products to ensure a high level of reliability. This program includes attention to reliability factors during product design, the support of stringent Quality Control requirements, and compulsory corrective action procedures. These measures, together with conservative specifications have made the name Endevco synonymous with...