Z-AXISIn a gyro, an axis through the center of gravity and mutually perpendicular to both the X (spin)
and Y axes .
ZENER DIODEA PN-junction diode designed to operate in the reverse-bias breakdown region .
ZENER EFFECTA 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
ZEROINGThe process of adjusting a synchro to its electrical zero position .
ZONE OF MUTUAL VISIBILITYThe area where the satellite can be seen by both the up- and down-
link earth terminals .