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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].
