Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1988-11-09
1989-09-05
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
455226, G01S 740, H04B 116
Patent
active
048642185
ABSTRACT:
A method of measuring and compensating for measurement frequency inaccuracies encountered when measuring noise power of a device under test within a desired calibrating frequency range. The method includes sweeping a frequency synthesizer through a frequency range which includes the desired measurement frequency range. Power is measured for different synthesizer frequencies with the noise power meter set to the desired frequency range. Alternatively, the frequency synthesizer may be set to the desired measurement frequency and the noise power meter swept through a range including the desired measurement frequency. The resulting power measurements show the frequency range within which the noise power meter actually measured power. The difference between the desired measurement frequency range and the actual measurement frequency range is the measurement frequency error which may be corrected using a frequency conversion stage to displace test signals by the amount of the measurement frequency error before they are sent to the noise power meter.
REFERENCES:
patent: 3936753 (1976-02-01), Clark
patent: 4232398 (1980-11-01), Gould
patent: 4491783 (1985-01-01), Sawayama
patent: 4685150 (1987-08-01), Maier
patent: 4714873 (1987-12-01), McPherson
Kuhn; "Accurate and Automatic Noise Figure Measurements with Standard Equipment"-Intnl. MW Symposium-May 1980-(pp. 425-427).
Davidson Andrew C.
Leake Bernard W.
Cascade Microtech, Inc.
Eisenzopf Reinhard J.
Solis Jose M.
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