TM 11-6625-2980-14
Section 3-PG 508
SERVICE INFORMATION
Symbols and Reference Designators
Electrical components shown on the diagrams are in the following units unless noted otherwise:
Capacitors = Values one or greater are in picofarads (pF).
Values less than one are in microfarads (p/F).
Resistors = Ohms (i).
Graphic symbols and class designation letters are based on ANSI Standard Y32.2-1975.
Logic symbology is based on ANSI Y32.14-1973 in terms of positive logic. Logic symbols depict the logic
function performed and may differ from the manufacturer's data.
The overline on a signal name indicates that the signal performs its intended function when it goes to the low state.
Abbreviations are based on ANSI Y1.1-1972.
Other ANSI standards that are used in the preparation of diagrams by Tektronix, Inc. are:
Y14.15, 1966 Drafting Practices.
Y14.2, 1973 Line Conventions and Lettering.
Y10.5, 1968 Letter Symbols for Quantities Used in Electrical Science and
Electrical Engineering.
The following prefix letters are used as reference designators to identify components or assemblies on the diagrams.
A Assembly separable or repairable H Heat dissipating device (heat sink. S Switch or contractor
(circuit board, etc) heat radiator, etc) T Transformer
AT Attenuator. fixed or variable HR Heater TC Thermocouple
B Motor HY Hybrid circuit TP Test point
BT Battery J Connector, stationary portion U Assembly, inseparable or non-repairable
C Capacitor. fixed or variable K Relay (integrated circuit. etc )
CB Circuit breaker L Inductor. fixed or variable V Electron tube
CR Diode, signal or rectifier M Meter VR Voltage regulator (zener diode. etc)
DL Delay line P Connector, movable portion W Wirestrap or cable
DS Indicating device (lamp) 0 Transistor or silicon-controlled Y Crystal
E Spark Gap, Ferrite bead rectifier Z Phase shifter
F Fuse R Resistor, fixed or variable
FL Filter RT Thermistor
3-1
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