FIELD: electronic engineering. SUBSTANCE: method involves varying amount of positive and negative feedback in element with adjustable turn-on and turn-off voltage and current. Device implementing this method has power supply, loading resistor, capacitor, voltmeter, S-type element. In addition, it is provided with n-p-n transistor, four resistors, reference-frequency oscillator, two frequency-to-number converter, counter, digital-to-analog converter, integrator, switch, two voltmeters, milliammeter, and jumper. EFFECT: improved accuracy of checking preset negative differential resistance. 2 cl, 3 dwg
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