What is REFERENCE LEVEL?

A specified level of power, voltage or current in a circuit or system, to which all other levels of those quantities are referred, usually as a ratio expressed in dB. 1 mW is frequently taken as a reference signal power level, and is described as 0 dBm zero decibels with respect to 1 mW. If voltages or currents are taken as reference levels, then it is customary and desirable to state the impedance level at which the measurement is to take place.


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