TDS 420A, TDS 430A & TDS 460A Service Manual
9-1
Diagrams
This chapter contains the block diagram and the interconnection diagram for this
oscilloscope. If servicing a TDS 430A, ignore all references to CH 3 and CH 4.
Symbols
Graphic symbols and class designation letters are based on ANSI Standard
Y32.2--1975. Abbreviations are based on ANSI Y1.1--1972.
Logic symbology is based on ANSI/IEEE Std 91--1984 in terms of positive
logic. Logic symbols depict the logic function performed and can differ from the
manufacturer’s data.
A tilde (~) preceding a signal name or an asterisk following a signal name
indicates that the signal performs its intended function when in the low state.
Other Tektronix, ANSI, and military standards are also used in the preparation of
diagrams by Tektronix, Inc.
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