PROCESS OF CALIBRATION OF METER OF AMPLITUDE MODULATION FACTOR Russian patent published in 2002 - IPC

FIELD: radio engineering, certification of reference measurement aids. SUBSTANCE: technical result of invention lies in increased accuracy of formation of amplitude-modulated signals thanks to diminished effect of instability of amplitude and frequency of modulating oscillation on value of amplitude modulation factor. Process includes formation of reference AM signals by harmonic action on element of meter with modulation frequency F_m to form AM oscillations which determines oscillation amplitude of carrier frequency f_H with subsequent measurement of maximal and minimal values of AM signal and computation of modulation factor by them. Trains of rectangular pulses of double frequency f_H are formed from harmonic oscillations of carrier frequency 2f_H which control commutator switching over resistors of scale converter which relation determines value of its gain factor at moments of transit by oscillations of carrier frequency f_H of zero values and changes by harmonic law of modulation. EFFECT: increased accuracy of formation of amplitude-modulated signals. 2 dwg