Abstract
The measurement of small harmonic distortion factors (Fh~O~%) in the frequency range from 20 Hz to 20 kHz when checking low-frequency (LF) oscillators that have an exact output wave shape involves certain difficulties. It is not possible to utilize the type $6-5 nonlinear distortion meter (NDM) produced by the industry for this purpose because its measuring error Kh~0.05 % at the limit of 0.1% may exceed 50%. This is due to the narrow dynamic range of the type $6-5, which is limited on the low side mainly by the self-noise of the instrument (50 BV); also to the inadequate attenuation factor of the rejection amplifier at the frequency of the fundamental as well as the presence of induction and of nonlinear distortion products that occur during the passage of the test signal through nonlinear circuits of the type $6-5 instrument.
Published Version
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