Method for Measuring Small Nonlinearities of Electric Characteristics

Tom Guldbrandsen, Niels I Meyer, Jørgen Schjær-Jacobsen

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    A method is described for measuring very small deviations from linearity in electric characteristics. The measurement is based on the harmonics generated by the nonlinear element when subjected to a sine wave signal. A special bridge circuit is used to balance out the undesired harmonics of the signal generator together with the first harmonic frequency. The set-up measures the small-signal value and the first and second derivative with respect to voltage. The detailed circuits are given for measuring nonlinearities in Ohmic and capacitive components. In the Ohmic case, a sensitivity in the measurement of the relative second order nonlinearity of about 5×10−8 is obtained. In the capacitive case, the sensitivity expressed in terms of the minimum measurable values of the derivatives is dC/dV = 1.5×10−17 F/V and d2C/dV2 = 2×10−16 F/V2. ©1965 The American Institute of Physics
    Original languageEnglish
    JournalReview of Scientific Instruments
    Issue number6
    Pages (from-to)743-746
    Publication statusPublished - 1965

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    Copyright (1965) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.


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