A description is given of an experimental technique for rapidly and accurately measuring the devil's staircase, a structure of frequency lockings in a periodically forced nonlinear oscillator. This technique uses a personal computer, a programmable oscillator, and a frequency counter. The authors analyze the method, discuss its limitations, and present experimental results for two simple test circuits.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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