Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1993-03-23
1994-06-28
Wieder, Kenneth A.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324161, 324 7647, 328134, 307526, 340658, G01R 2302
Patent
active
053250494
ABSTRACT:
Based on a desired center frequency and a frequency resolution for a signal to be measured which are entered via an operator section, a micro-CPU calculates the frequency dividing number, a preset value and a center value for the signal to be measured. The frequency dividing number is set in a frequency divider, which frequency divides the signal to be measured and provides the frequency-divided output to a continuous period-to-voltage converter. The continuous period-to-voltage converter counts clock pulses occurring in each frequency-divided period, measures the difference between fractions of time from both the beginning and the end of the frequency-divided period to the generation of the next clock pulses, respectively, and outputs, as a voltage corresponding to the frequency-divided period, the sum of a voltage corresponding to a predetermined number of consecutive low-order bits of a binary value, obtained by adding the preset value to the pulse count value, and the fractional time difference. A subtractor is supplied with a voltage corresponding to the frequency-divided period and a voltage corresponding to the center value and outputs the voltage difference as a frequency-divided period deviation, and the micro-CPU calculates a frequency deviation of the measured signal from the center frequency on the basis of the frequency-divided period deviation.
REFERENCES:
patent: 3990007 (1976-11-01), Hohhof
patent: 4236110 (1980-11-01), Shearer
patent: 4709224 (1987-11-01), Fiori
patent: 4769798 (1988-09-01), Hayashi
"Phase Difference or Relative Frequency Deviation Measuring Instrument," K. Nishikawa, Patent Abstracts of Japan, vol. 13, No. 342 (P-908), Apr. 19, 1989.
Chinoda Kazuyoshi
Hayashi Mishio
Advantest Corporation
Solis Jose M.
Wieder Kenneth A.
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