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Z

Z-AXIS

In a gyro, an axis through the center of gravity and mutually perpendicular to both the X (spin) and Y axes [15].


ZENER DIODE

A PN-junction diode designed to operate in the reverse-bias breakdown region [7].

ZENER EFFECT

A reverse breakdown effect in diodes in which breakdown occurs at reverse voltages below 5 volts. The presence of a high energy field at the junction of a semiconductor produces the breakdown [7].


ZEROING

The process of adjusting a synchro to its electrical zero position [15].

ZONE OF MUTUAL VISIBILITY

The area where the satellite can be seen by both the up- and down-link earth terminals [17].