FIELD: testing of octane number of motor fuel. SUBSTANCE: device determining dielectric properties has flow-type three-electrode measurement transducer with measurement oscillatory circuit and filling-type standard three-electrode transducer with standard oscillatory circuit, channel commutator, signal mixer, reference frequency generator, control and synchronization unit and signal indicator. Signal mixer has frequency range of change of output signal from $$$ Hz up to $$$ Hz. EFFECT: enhanced functional properties of device.
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