Discussion
................ of a measuring system refers to its ability to follow instant by instant the measured with time.
Answer: B
The property described is fidelity.
Fidelity is one of the dynamic characteristics of a measuring system: its ability to reproduce the input faithfully, following the measured quantity instant by instant as it varies with time, without dynamic error. A system of high fidelity gives an output waveform that matches the input waveform.
Measurement lag is the delay in the system's response, which reduces fidelity rather than describing it. Settling time is how long the output takes to come within a band of its final value after a step, and bandwidth is the range of frequencies the system passes. Both affect how well it can follow a signal, but neither is the name of that ability.
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