Logic - Tektronix CURVE-TRACER 576 Instruction Manual

TABLE 8-1
Components Numbers
Component Numbers
On Diagrams Diagram Number Circuit
1-99 2,4 Step Generator
100-199 3,4 Step Amplifier
200-299 3,4 Step Amplifier
300-399
1, 6 Collector Supply, Standard Test
Fixture
400-499 5,8 Display Sensitivity Switching,
Display Positioning
500-599 9 Vertical Display Amplifier
600-699 9
Horizontal Display Amplifier
700-799
13
Power Supply
800-899 14 CRT Circuit
900-999
10, 11
Readout Switching and I ntercon-
nections, Readout Logic
1000-1199 12 Readout Lamps
Circuit Diagrams and the Circuit Board Pictures. To locate a component (physically) in the
instrument from a circuit number on a circuit diagram, refer to the circuit board pictures at the
end of Section 5. Each component in a circuit board picture is identified by its circuit number.
The black lines on the circuit diagrams enclose components located on circuit boards, and can
thus be used to determine on which circuit board a component is located. Fig. 4-7 shows where
in the instrument each circuit board is located. Table 8-1 helps determine where a component
on a circuit board (or in a circuit board picture) is located in the circuit diagrams.
Logic
The schematics and block diagrams in this manual which involve digital logic are drawn in
terms of positive logic. In positive logic, the true state is the more positive of the two logic
levels and the false state is the more negative. The small circles on some of the inpu_t or output
terminals of the logic symbols indicate a logic negation. Any terminal having a logic negation
symbol on it will be at a false level (or low) when the related device is in its activated state. For
further information on the logic used in this manual seeM I L-STO 8068.
Pertinent information about the integrated circuits used in the Step Generator circuits is
given in Figs. 8-1 and 8-2. The symbols used conform to M I L-STD 8068. The truth tables are
constructed in terms of highs and lows: a high representing a true state and a low representing a
false state.
ADD AUG 1982
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