True or False: 1 millivolt measured across 750M equals 0 dBmV?

The statement that 1 millivolt measured across a 750 ohm load equals 0 dBmV is true based on the reference levels used in telecommunications and cable industries. In these contexts, the dBmV unit expresses voltage in relation to 1 millivolt. The dBmV scale allows for easy conversion of voltages into a logarithmic scale, which is simple to use for comparing signal strengths.

Specifically, 0 dBmV refers to 1 millivolt when measured across a characteristic impedance of 750 ohms. Consequently, if 1 millivolt is the reference level for 0 dBmV, then it logically follows that if the voltage level is exactly 1 millivolt across this impedance, it indeed equals 0 dBmV. Understanding this relationship is crucial for technicians assessing signal levels in cable systems, as it facilitates the evaluation of signal quality and strength effortlessly.

Other scenarios, like variations in impedance or different reference levels, could result in different conversions, which is why specificity in measurement context is important in answering this question.