FIELD: electrical engineering. SUBSTANCE: device has voltage source, piezoelectric element with probe fixed to it, and terminal for connection of specimen which forms tunnel clearance together with probe. In addition, device has fixed resistor connected in parallel to piezoelectric element inserted between probe and voltage source connected to terminal. Piezoelectric element connection polarity is such that voltage rise across piezoelectric element provides for probe displacement away from specimen. EFFECT: more reliable control. 2 cl, 4 dwg
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