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What is the fixed pulse width of the pulse after process of one-shot circuit?

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What is the fixed pulse width of the pulse after process of one-shot circuit?

(a) 110 ms

(b) 170 ms

(c) 230 ms

(d) 280 ms

This question was posed to me in an online quiz.

Origin of the question is Recording System topic in portion Foetal Monitoring Instruments of Biomedical Instrumentation

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The correct option is (c) 230 ms

The explanation: After peak detection, the processed pulses operate a one-shot circuit which gives a fixed pulse width of 230 ms. The output of one-shot triggers a variable pulse width multi-vibrator which adds and gives either 43 or 116 ms time depending on the heart rate. The pulse width at the output will be either 230 + 43 = 273 ms or 230 + 116 = 346 ms.

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