HP 8559A Operation And Service Manual page 271

SERVICE
SYMBOLS USED I N SCHEMATIC AND BLOCK DIAGRAMS
Indicator Symbols (positive logic assumed)
FIGURE 8-1. SYMBOLS USED IN SCHEMATIC AND BLOCK DIAGRAMS (4 OF 4)
BASIC LOGIC SYMBOLS
EDGE-TRIGGERED (dynamic) inputs
are indicated by the presence of the
dynamic input symbol.
Input is active only on the positive-going
transition.
ACTIVE PERIOD
Input is active only on the negative-
going transition.
ACTIVE PERIOD
ACTIVE-HIGH inputs and outputs are
indicated by the absence of the negation
symbol,
ACTIVE PERIOD
ACTIVE-LOW inputs and oututs are in-
dicated by the presence of the negation
symbol,
ACTIVE PERIOD
0 .
MODEL 8559A