Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Parameter related to the reproduction or fidelity of a...
Patent
1991-03-26
1992-07-21
Strecker, Gerard R.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Parameter related to the reproduction or fidelity of a...
324 77CS, 324 77C, 324603, 455 87, G01R 2316
Patent
active
051326302
ABSTRACT:
In an analyzer for measuring the frequency characteristics of quadripoles, comprising an indicator circuit in which the output of the quadripole to be measured is converted to an intermediate frequency by a mixer and a frequency-variable local oscillator, and comprising a variable-frequency second local oscillator whose output frequency is mixed with another mixer and with the frequency of the local oscillator to be converted to an input signal for the quadripole to be measured, the output frequency of the variable frequency second local oscillator is adjusted to be offset by at least .+-.5 MHz relative to the intermediate frequency value of the indicator circuit.
REFERENCES:
patent: 2931900 (1960-04-01), Goodman
patent: 3643126 (1972-02-01), Hay
patent: 4373205 (1983-02-01), Mizota
patent: 4451782 (1984-05-01), Ashida
Wandel & Goltermann, "Electronic Measurement Techniques," Edition 1989, pp. 163-168.
Rohde & Schwarz GmbH & Co. KG
Solis Jose M.
Strecker Gerard R.
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