Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Parameter related to the reproduction or fidelity of a...
Patent
1987-11-12
1990-01-23
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Parameter related to the reproduction or fidelity of a...
324612, G01R 2700
Patent
active
048960950
ABSTRACT:
A circuit for determining frequency response includes a voltage controlled oscillator (VCO) which generates a signal for application to a system under test and a counter which either counts quartz-stabilized pulses during a VCO period or which counts, during a quartz-stabilized counting interval, the VCO output itself. The counts represent with quartz accuracy the test frequency, which corresponds to the mean value within the counting interval, and are associated with respective measurement of signal level returned from the unit under test to thereby establish frequency response. Counts, together with corresponding levels developed by the system under test, are applied to a suitable display.
REFERENCES:
patent: 3968427 (1976-07-01), Sharrit
patent: 4085361 (1978-04-01), Bathiany et al.
patent: 4095057 (1978-06-01), Power et al.
Chapter 4, Integrated Devices in Digital Circuit Design, G. Hope, Wiley, 1981, pp. 387-389, Electronic Instrumentation and Measurement Techniques, W. D. Cooper (2nd Ed., Prentice-Hall, 1978).
Eisenzopf Reinhard J.
Harvey Jack B.
Schlumberger Messgerate GmbH
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