Tektronix 7B70 Time Base Instruction Manual page 81

SECTION 7
DIAGRAMS A N D MECHANICAL PARTS ILLUSTRATIONS
Symbols and Reference Designators
Electrical components shown on the diagrams are i n the following units unless noted otherwise:
Capacitors
=
Values one or greater are in picofarads (pF).
Values less than one are in microfarads (pF).
Resistors
=
Ohms
(R)
Symbols used on thediagrams are based on USA Standard Y32.2-1967.
Logic symbology is based on MIL-STD-806B in terms of positive logic. Logic symbols depict the logic function performed
and may differ from the manufacturer's data.
The following special symbols are used on the diagrams:
External Screwdriver adjustment.
External control or connector.
Clockwise control rotation in direction of arrow
0
Refer t o diagram number indicated in diamond.
Connection soldered t o c i r c u ~ t board.
Connect~on made ro c ~ r c u ~ t board w ~ t h
interconnecting
pln.
d - Blue tlnt encloses components located on c~rcuit board.
The following prefix letters are used as reference designators t o identify components or assemblies on the diagrams.
A Assembly, separable or repairable (circuit board, etc.) LR Inductor/resistor cqmbination
AT Attenuator, fixed or variable M Meter
8 Motor Q Transistor or silicon-controlled rectifier
BT Battery P Connector, movable portion
C Capacitor, fixed or variable R Resistor, fixed or variable
CR Diode, signal or rectifier RT Thermistor
D L Delay line S Switch
DS Indicating device (lamp) T Transformer
F Fuse TP Test point
FL Filter U Assembly, inseparable or non-repairable (integrated
H Heat dissipating device (heat sink, heat radiator, etc.) circuit, etc.)
HR Heater V Electron tube
J Connector, stationary portion VR Voltage regulator (zener diode, etc.)
K
Relay Y Crystal
L Inductor, fixed or variable
Scans
by ArtekMedia O 2006