9.
Other Symbols.
Many other symbols exist and may be found on
schematic diagrams. It would be impractical to attempt to illustrate
them all.
However, the symbols discussed below are components that
are likely to be found in Army fire control applications.
a. Grounds.
The circuit return or completion is normally
accomplished through the use of grounds. Grounds are usually of two
types:
(1) Earth ground is a direct conducting connection to the earth
or some structure.
The symbol used to represent earth ground is
shown in figure 1-33A.
Figure 1-33.
Ground Connections.
(2) Chassis ground is a conducting connection to the chassis or
frame of the equipment or circuit. The chassis ground may not be at
the same potential as the earth ground.
The symbol for a chassis
ground is shown in figure 1-33B.
A third symbol may be used to indicate a ground connection when all
identically annotated return connections are at the same potential.
The symbol for these common-ground connections is shown in figure
1-33C.
b. Antennas.
Many electronic devices require the use of an
antenna to receive input signals.
The types of antennas used vary
greatly, based on the function of the equipment.
Figure 1-34
illustrates some of the common symbols used for antennas.
Figure 1-34.
Antenna Symbols.
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