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Measurement systemA measurement system is described for providing an indication of a varying physical quantity represented by or converted to a variable frequency signal. Timing pulses are obtained marking the duration of a fixed number, or set, of cycles of the sampled signal and these timing pulses are employed to control the period of counting of cycles of a higher fixed and known frequency source. The counts of cycles obtained from the fixed frequency source provide a precise measurement of the average frequency of each set of cycles sampled, and thus successive discrete values of the quantity being measured. The frequency of the known frequency source is made such that each measurement is presented as a direct digital representation of the quantity measured.
Document ID
19730021654
Acquisition Source
Legacy CDMS
Document Type
Other - Patent
Authors
Turner, J. W. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
September 2, 2013
Publication Date
July 10, 1973
Subject Category
Instrumentation And Photography
Accession Number
73N30386
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
US-PATENT-3,745,475|NASA-CASE-MFS-20658-1
Patent Application
US-PATENT-APPL-SN-205675

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