Figure 4-3.-Precise-access blocked diagram.
Figure 4-4.-Functional circuit symbols used on precise-access block diagrams.
Notice that concise text, suitable to the component being
code is realized on high-level diagrams where much
described, replaces the circuit elements in the respective
information must be confined to a small space.
blue-shaded area. Paragraph numbers, references to
illustrations, complete sentence structures, and formal
PRECISE-ACCESS BLOCKED DIAGRAM
grammatical rules are not necessary to impart all needed
information. The use of facing pages, similar block
A precise-access blocked diagram is the next higher
arrangements of text and components being described,
level diagram (fig. 4-3). It emphasizes levels of physical
enables a rapid association between text and blocks, text
containment (units, assemblies, and so on) of the
and circuit detail, and circuit detail and blocks. Like the
components with respect to their enclosures. Four basic
blocked schematic, each blue-shaded area includes a
shapes are used as symbols on this diagram to show the
circuit-identifier code for identification of the
kind of circuit through which the signal is being
components being described. The greatest value of this
processed. These symbols are shown in figure 4-4.