Nonlinearity detection using fault-generated second harmonic

Details Nonlinearity detection using fault-generated second harmonic Nonlinearity detection using fault-generated second harmonic

1982-04-30

1985-01-29

Krawczewicz, Stanley T.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 711, 29574, G01N 2700

Patent

active

044969007

ABSTRACT:
The tester and method for nondestructively detecting nonlinearity faults in conductors includes the application of a composite AC and DC drive signal to the device under test in such manner that nonlinearities in the device under test produce fault signals including second harmonics, due to local changes of resistance caused by ohmic heating. Electronic filters are used to select out and amplify the second harmonic only, eliminating the direct current and fundamental frequency components of the initial test pulse, plus third and subsequent harmonics. The filtered second harmonic signals from the device under test are then phase-compared to a phase-shifted second harmonic signal produced by a frequency doubler from the test signal generator oscillator to cancel out the second harmonic signals from the good conductor; the remaining phase anomaly signals control a threshold detector remaining to provide fault indication.

REFERENCES:
patent: 2758276 (1956-08-01), Foerster
patent: 3299351 (1967-01-01), Williams
patent: 3500188 (1970-03-01), Whitley
patent: 3624496 (1971-11-01), Feinstein
patent: 3733545 (1973-05-01), Elsner
H. E. Meier, "Circuit Board Testing," IBM Technical Disclosure Bulletin, vol. 23, No. 9, Feb. 1981, p. 4092.

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