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The range of FHR measurement due to substitution logic is between __________ bpm.

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The range of FHR measurement due to substitution logic is between __________ bpm.

(a) 20-220

(b) 60-260

(c) 40-240

(d) 0-200

I had been asked this question in unit test.

My doubt stems from Measurement of Hearing topic in chapter Audiometry of Biomedical Instrumentation

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The correct choice is (c) 40-240

To explain I would say: The range of FHR measurement due to substitution logic is between 40-240 bpm. The range of FHR measurement is limited to 40–240 bpm because of the substitution logic. Thereafter, the output of logic circuits go to standard heart rate computing circuits. The substitution logic requires a delay time to establish a missing foetal trigger pulse. It is thus kept as 270 ms.

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