What is the range of FHR measurement due to substitution logic?

What is the range of FHR measurement due to substitution logic? Correct Answer 40-240 bpm

The substitution logic requires a delay time to establish a missing foetal trigger pulse. It is thus kept as 270 ms. The range of FHR measurement is limited to 40–240 bpm because of the substitution logic. Thereafter, the output of logic circuits goes to standard heart rate computing circuits.
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