Accession Number : AD0465879


Title :   A DIGITAL AMPLITUDE AND PHASE MEASURING SYSTEM (DAPHNE)


Descriptive Note : Technical rept.


Corporate Author : ROYAL AIRCRAFT ESTABLISHMENT FARNBOROUGH (UNITED KINGDOM)


Personal Author(s) : Leedham, H C


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/465879.pdf


Report Date : Dec 1964


Pagination or Media Count : 53


Abstract : A transportable automatic measuring and recording system has been designed and constructed for experiments concerned with oscillatory derivative measurements in wind tunnels. A wattmeter method is used to resolve the input signals in the frequency range 0.05 c/s to 1 kc/s into in-phase and quadrature components referred to the drive or other reference, and accurate measurement of frequency is made by an electronic counter. Results of these measurements together with reference data are automatically read out and printed. A punched- paper tape record is also produced for computation by a digital computer. This Report describes the equipment in a general manner and discusses some of the factors affecting accuracy. The system is adaptable for other work involving the measurement of the relative phases and amplitudes of a number of signals.


Descriptors :   *MEASURING INSTRUMENTS , PERFORMANCE(ENGINEERING) , TRANSDUCERS , CIRCUITS , WIND TUNNELS , PULSE COUNTERS , PHASE METERS , PUNCHED TAPE , UNITED KINGDOM


Subject Categories : Test Facilities, Equipment and Methods


Distribution Statement : APPROVED FOR PUBLIC RELEASE