FIELD: instruments, in particular, for security and fire alarm services, devices for measurements of linear size and movements. SUBSTANCE: device has crystal oscillator of rectangular signals which on-off time ratio is equal to -2 and which has two opposite phase outputs which output characteristics are identical except phases. In addition device has two units of reactance elements, which are designed as capacitance detectors, adder and recording unit. EFFECT: increased field of application due to increased efficiency and precision of operations. 1 dwg
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