HP 5300A - Theory of Operation; Introduction: ©: 5.26623; Binary Logic and Gating

Model 5300A
Theory of Operation
&
SECTION
IV
THEORY OF OPERATION
4-1. INTRODUCTION
4-2. This section describes the basic and overall
instrument theory of operation and detailed individual
assembly operation.
4-3. BINARY LOGIC AND GATING
4-4. The5300A Measuring System and its associated
plug-ons use integrated circuits. It is necessary to
understand basic logic symbols and their application
gating. In the circuit diagrams, AND gate, OR gate,
NAND gate, NOR gate, Inverted Input gate, Inverter
and Amplifier symbols are used. The following para-
graphs and illustrations introduce logic symbols and
their application.
4-5. Two states exist in the binary system, 1 and 0.
HIGH (H) and LOW(L) are used to represent the levels
of land 0. HIGH always represents the more positive
level whether it be positive or negative logic. Fig-
ure 4-1 shows four pairs of logic symbols that have
the sametruth tables and canbe used interchangeably.
The same function is performed by twodifferent logic
© symbols.
4-6. GATES. Figure 4-2A represents a basic AND
gate. The AND gate output is HIGH if all inputs are
HIGH. An AND gate may have two or more inputs.
Figure 4-2B represents the basic OR gate. The OR
gate output is HIGH if oneor more of its inputs is HIGH.
The OR gate may have two or more inputs.
Figure 4-2. Gate Symbols
ae _
he Sih INVERTER
Figure 4-1. Logic Comparison Diagrams