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If the period duration is lesser than 400 ms, the one-shot will deliver a pulse.

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If the period duration is lesser than 400 ms, the one-shot will deliver a pulse.

(a) True

(b) False

I had been asked this question during an online interview.

The origin of the question is Recording System in division Foetal Monitoring Instruments of Biomedical Instrumentation

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Correct choice is (b) False

The best explanation: False, to detect the heart frequency, the 400 ms one-shot is used. If the period duration is greater than 400 ms, the one-shot will deliver a pulse. The negative slope of this pulse is used to trigger the 20 ms one-shot. These 20 ms pulses are integrated by the integrator and the output of this integrator is compared with a fixed voltage -V.

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