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Referentie-gerelateerde dB's

Referentie-gerelateerde dB's zijn gedefinieerd als: 10∙log(P/Pref) of 20∙log(U/Uref). In de onderstaande tabel staan de meestvoorkomende dB's.

dBVUref = 1URMSdBV = 20∙log(U/1VRMS)
dBWPref = 1WdBW = 10∙log(P/1W)
dBjUref = 1mVRMSdBj = 20∙log(U/1mVRMS)
dBmPref = 1mWdBm = 10∙log(P/1mW)
dBu (=dBv)Uref = √0.6V = 0.775VRMS  (0.6V is de spanning over een weerstand van 600 ohm die 1mW dissipeert)dBu = 20∙log(U/0.775VRMS)

Voorbeelden: 0dBV = 1V = 60dBj; 0dBW = 1W = 30dBm.

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