Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With voltage or current conversion
Patent
1997-01-13
2000-02-22
Karlsen, Ernest
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With voltage or current conversion
324606, 327117, G01R 1918, H03B 1900
Patent
active
060284250
ABSTRACT:
Apparatus is described for generating a frequency-sweepable measurement signal and a local signal with a frequency separated from the measurement signal frequency by an intermediate frequency. The measurement signal and a local signal are generated by a simple structure, including a high-frequency variable-frequency signal source, a low-frequency fixed-frequency signal source, a first frequency divider and a second frequency divider. The variable-frequency signal source is a sweepable signal source. The first frequency divider divides an output frequency fa from the variable-frequency signal source by n and outputs a measurement signal with a frequency of fa
. The signal of the variable-frequency signal source is also applied to the first input of the second frequency divider, and the signal of fixed-frequency signal source, with a frequency of fb, is applied to the second input. The second frequency divider removes a one period signal from the signal of the variable-frequency signal source each period of the signal of fixed-frequency signal source, thus obtaining a signal with a frequency of fa-fb. This latter signal is divided by n and a signal with a frequency of (fa-fb)
is output as the local frequency. fb
is the intermediate frequency.
REFERENCES:
patent: 4733167 (1988-03-01), Tamamura
patent: 4780890 (1988-10-01), Kane
patent: 5056108 (1991-10-01), Lund
Hewlett-Packard Services Manual, Model 4194A, Impedance/Gain-Phase Analyzer, printed Jun., 1986, 3 pages.
Yagi Kazuyuki
Yamashita Hideki
Hewlett--Packard Company
Karlsen Ernest
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