In a broadband cable network, why are power measurements taken by measuring a channel's voltage level across an assumed load impedance?

Taking power measurements by measuring a channel's voltage level across an assumed load impedance is primarily about practicality and minimal disruption. By using an assumed load impedance, technicians can efficiently gauge the power levels in the network without needing to interrupt service or alter the active system significantly.

This method enables technicians to take readings while the network is operational, ensuring that customers experience little to no downtime. Accurate measurements are crucial, but ease of measurement in a live system is often prioritized in operational contexts to maintain network reliability.

Other factors such as the cost of equipment, the type of measurements (real-time versus not), and the potential for achieving accuracy can influence the choice of measurement techniques, but the essential benefit of taking measurements across an assumed load impedance lies in the ease and non-disruptiveness of this approach, allowing for streamlined operations in a broadband environment.