Accession Number : AD0699900

Title :   A MINIATURIZED PRECISION TIME SOURCE FOR USE IN SELF-CONTAINED INSTRUMENTS,

Corporate Author : WOODS HOLE OCEANOGRAPHIC INSTITUTION MASS

Personal Author(s) : Breslau,Lloyd

Report Date : OCT 1961

Pagination or Media Count : 16

Abstract : A miniaturized precision time source for use in self-contained instruments was designed and constructed. This instrument was devised expressly to provide a precision time base for the submersible pingers now used at the Woods Hole Oceanographic Institution. The device employs a 100 kc per second crystal as its frequency standard, a silicon transistor oscillator stage, a germanium transistor buffer stage, and five silicon unijunction transistors as decade frequency division stages. It is stable over the entire range of temperatures found in the ocean. The output consists of a positive pulse occurring at one second intervals and at a voltage level adequate for direct application to a cold cathode trigger tube. The frequency stability is better than two parts per million per degree centigrade as determined by the temperature coefficient of the quartz crystal presently employed, which is operating at ambient temperature. The point to point jitter is less than one part per million. (Author)

Descriptors :   (*TIMING DEVICES, *UNDERWATER SOUND GENERATORS), MINIATURE ELECTRONIC EQUIPMENT, PULSE GENERATORS, CRYSTAL OSCILLATORS, FREQUENCY DIVIDERS, TRANSISTORS, QUARTZ

Subject Categories : Test Facilities, Equipment and Methods
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE