(1) Abbreviation for decibel; (2) The loss of a signal in a conductor expressed in decibels, denoting the ratio of the power input to output; (3) One tenth of a bel.

Delay Line:

A cable made to provide a very low velocity of propagation with a long electrical delay for transmitted signals.

Derating Factor:

A factor used to reduce a current-carrying capacity of a wire when used in environments other than that for which the value was established.


(1) Any insulating medium that intervenes between two conductors and permits electrostatic attraction and repulsion to take place across it; (2) A non-conductive insulator. An "insert" material.

Dielectric Strength:

The voltage which an insulating material can withstand before breakdown occurs, usually expressed as a voltage gradient (such as volts per mil).


A measurement used to denote the hardness of a substance, usually an elastomer.