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D

DECIMAL NUMERAL

A decimal representation of a number [13].

DECIMAL POINT

The radix point in decimal representation [13].

DECOUPLING CAPACITOR

A capacitor used to transfer unwanted signals out of a circuit; for example, coupling an unwanted signal to ground. Also called a BYPASS CAPACITOR [8].


DEFLECTION COILS

In a cathode-ray tube, coils used to bend an electron beam a desired amount [18].

DEFLECTION PLATES

Two pairs of parallel electrodes, one pair set forward of the other and at right
angles to each other, parallel to the axis of the electron stream within an electrostatic cathode-ray tube [6].


DEGENERATION

The process whereby a part of the output signal of an amplifying device is returned to its input circuit in such a manner that it tends to cancel part of the input [7].


DEGENERATIVE FEEDBACK

Feedback in which the feedback signal is out of phase with the input signal; also called NEGATIVE FEEDBACK [8].


DEGREE-OF-FREEDOM

The number of axes about which a gyro is free to precess [15].

DEIONIZATION POTENTIAL

The potential at which ionization of the gas within a gas-filled tube ceases and conduction stops; also referred to as extinction potential [6].


DEIONIZATION TIME

In a spark gap, the time required for ionized gas to return to its neutral state
after the spark is removed [18].



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