Accession Number : AD0282731

Title :   INSTRUMENTATION AND MEASUREMENT TECHNIQUES STUDY

Corporate Author : IIT RESEARCH INST CHICAGO ILL

Personal Author(s) : ASHBY,A.T.

Report Date : 30 APR 1962

Pagination or Media Count : 1

Abstract : A current probe for use with printed circuitry which senses branch currents in parallel circuits and displays the angle and magnitude of the impedance across which a 159 Kc voltage is impressed is described. The present breadboard version also allows use of a Hewlett-Packard type clamp-around current probe to perform similar measurements where the conductors are wires. The location of faults on loaded spiralfour cable by means of a phase measurement technique is evaluated experimentally. Agreement with predicted results is sufficient to yield results accurate to about 10%, for faults up to 15 mi. Taking into account all apparent sources of error, it is anticipated that the technique could be implemented to provide accurate measurements within 5% out to 20 miles. Distortion product reduction techniques for single sideband for linear amplifiers are discussed, with especial emphasis on the location of the zero signal operating point as a means of achieving a minimum signal-to-distortion ratio. (Author)

Descriptors :   *INSTRUMENTATION, *MEASUREMENT, DISTORTION, ELECTRICAL IMPEDANCE, ELECTRONIC EQUIPMENT, FIELD WIRE COMMUNICATIONS, MILITARY EQUIPMENT, MODULATORS, PHASE SHIFT CIRCUITS, PRINTED CIRCUITS, SIDEBANDS

Distribution Statement : APPROVED FOR PUBLIC RELEASE