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.
What is REFERENCE LEVEL?
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