Two tone test method for determining frequency domain transfer

Details Two tone test method for determining frequency domain transfer Two tone test method for determining frequency domain transfer

1994-06-14

1996-02-06

Cosimano, Edward R.

Boots, shoes, and leggings

324501, 324750, G01R 31303, G01R 31304

Patent

active

054900905

ABSTRACT:
A method has been developed and used to non-intrusively interrogate electronic systems in order to determine the system's characteristic response to electromagnetic energy. The method involves subjecting the system under test to two continuous wave signal sources of different frequencies fl and fh and measuring the difference frequency .DELTA.f (fh-fl) emitted from the system under test. The difference frequency, created by mixing action of nonlinear electronic components within the system, is a relative indication of the system's response to fh, fl. By incrementing the two source signals fl and fh by the same frequency step size, .DELTA.f remains constant and is measured for each fh,fl value. The compilation of amplitude measures of .DELTA.f, normalized by the corresponding amplitude measures of fh, fl, provides a relative measure of the frequency domain transfer function of the system under test. The present method is performed with the test equipment in total isolation from the system under test and may be used to quickly and cost effectively identify those frequencies to which the system under test may be susceptible.

REFERENCES:
patent: 2942257 (1966-06-01), Huntington
patent: 3363249 (1968-01-01), Hershey et al.
patent: 3549999 (1970-12-01), Norton
patent: 4802216 (1989-01-01), Irwin et al.
patent: 4829238 (1989-05-01), Goulette et al.
patent: 5006788 (1991-04-01), Goulette et al.
High Power Microwave Source And Facility Development, vol. 1-High-Power Mowave Source and Effects Research Mar. 1990, Contract No.: DNA 001-85-C-0218.

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