Schematic Symbology And Schematic Diagram Notes - HP 11848A Service Manual

Schematic Notes Model 11848A
SCHEMATIC SYMBOLOGY AND SCHEMATIC DIAGRAM NOTES
Table 8 summarizes the symbology used in presenting many devices found in the instrument. The logic
symbols used in this manual are based on the Institute of Electrical and Electronic Engineers (IEEE)
in IEEE-STD 91-1984, Graphic Symbols for Logic Functions. This publication may be purchased from:
Institute of Electrical and Electronic Engineers
345 East 47th Street
New York, NY 10017
Table 8.Schematic Diagram Notes (1 of 11)
Board
Assembly
designation
Test points: symbols
are numbered for easy
correlation to schematic
diagrams, procedures.
and component location
diagrams. Connection to
circuit signifies
measuring aid (metal
post, circuit pad.
etc.) provided.
Plug-in
information;
number
indicates
pin of socket
(XA2).
Interconnect
information;
Circled letter
with adjacent
number indicates
circuit-path
continuation to
another service
sheet (3. in
this example).
Look for same
circled letter
on the indicated
service sheet.
Hire color code.
Code used
(MIL-STD-681)
is the same
as the resistor
color code.
First number
identifies the
base color.
second number
the wider stripe.
and the third
number the
narrower stripe.
Example:
ED
denotes white base.
yellow wide stripe.
violet narrow stripe.
Reference
designations
within outlined
assemblies are
abbreviated. Full
designation includes
assembly number;
for example.
Rl of assembly
A2 is A2R1.
Designations of
other components
are complete
as shown.
Large numbers
in lower
right corners of
schematic diagrams
are service
sheet numbers.
Asterisk indicates factory
selected components. (See
Section S ) .
Value selected for best operation.
Value shown is average or most
commonly selected value.
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