Statistics – Computation
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992esasp.340..119k&link_type=abstract
In ESA, Frequency and Time Forum p 119-122 (SEE N93-24978 09-70)
Statistics
Computation
Frequency Measurement, Piezoelectric Crystals, Quartz Crystals, Resonant Frequencies, Standards, Electrical Impedance, Transmission Circuits
Scientific paper
The history of practical methods of industrial measurement leading to the present situation is traced. Resonant frequency measurement of a quartz crystal unit has always presented problems due to the fact that a quartz crystal unit is not an absolute frequency determining device. The frequency of oscillation of a quartz crystal unit in an oscillator circuit is a function of the crystal unit and the maintaining oscillator circuit. Since the introduction of zero phase type measurements in a passive network by the I.E.C. in the early 1970's many of these measurement problems have been eliminated or much reduced, but there are still some problem areas. Using the computer aided test methods now available, automatic crystal measurements can be made. These can cause what might be termed computer aided correlation errors due to slightly different measuring procedures and methods of computation.
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