Special Features:

Finished: silvered surfaces will have a finish of 40 micro inches.Surfaces not silvered shall have a finish of 63 micro inches. Environmental: the element must be capable of operating over the temperatureb range of .30 degre c and of withstanding a non-operationg storage temperatue of range of .62 degree c to 85 degree c. Piezoelectric ceramic element shall conform to all the requirements and specified herein. Electrical: electro-acoustic. Polarization. Materials: shall be barium titanate elements. Electrodes nickel or silver. Resonant frequency shall be 25o khz + 5 khz at 10 days age

Properties:

A grouping of two or more different types of electrical/electronic components mounted on a common mounting. it may include an assembly of electrical/electronic components mounted on multiple printed wiring board(s) mounted back to back, stacked, and the like. the item is generally a component of a subassembly and cannot be assigned a more definite item name. excludes items which may be identified as a subassembly. for an assembly of electrical/electronic components mounted on a single printed wiring board, see circuit card asseembly. do not use if a more specific name applies.