What characteristic of a measurement is described if a radio frequency measuring receiver can accurately measure the amplitude of a signal as long as no interfering signal is within 10 kHz?

The characteristic being described pertains to selectivity, which refers to the ability of a receiver to differentiate between a desired signal and unwanted signals or noise that may interfere with the measurement. In this case, the radio frequency measuring receiver can accurately measure the amplitude of a signal as long as there are no interfering signals within 10 kHz. This indicates that the receiver is capable of isolating the desired signal from close-in interference, demonstrating its selectivity.

Selectivity is crucial in many applications, especially in communications and signal processing, as it ensures that the measurements taken are relevant and not skewed by surrounding frequencies. Therefore, the ability to measure accurately in the presence of potential interference at specific intervals, such as the mentioned 10 kHz, underscores the efficacy of the receiver's selectivity in performing its function correctly.