FIELD: measurement technology. SUBSTANCE: device has frequency gage, bipolar impulse shaper, supporting member, synchronous analog switch and unit for maintaining constant output voltage. Pulsating signals emitting from frequency gage outputs are shifted 90 deg out of phase. Impulse durations at bipolar impulse shaper output are not greater than quarter of frequency gage output signal period under maximum rotation speed conditions. EFFECT: high reliability of device operation. 3 dwg
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