Nautel NV5LT Troubleshooting Manual

Contents

Nautel NV5LT Troubleshooting Manual Manual pdf 258 page image

NV5LT/NV3.5LT TROUBLESHOOTING MANUAL READING ELECTRICAL SCHEMATICSPAGE 4.4.2 VERSION 3.3 2016-03-10Unique SymbolsNautel uses unique symbols on electrical schematics to describe logic (two-state) signals. These signalsdiffer from single-state signals or analog signals that may have multiple values.Type of Inputs and OutputsOn electrical schematics, names used to describe logic (two-state) input and output signals are prefixedwith a # symbol.Logic Level ConventionThe # prefix identifies an input or output signal that has two distinct states: high and low.The suffix on an input or output signal name identifies the active (true) state of the signal. The highsuffix (+) indicates the more positive of the two levels used to represent the logic states. The low suffix(-) indicates the less positive of the two levels.Two types of logic, positive and negative, may be represented on a particular schematic. In positivelogic, high represents the active (true) state, and low represents the inactive (false) state. In negativelogic, low represents the active (true) state, and high represents the inactive (false) state.Identifying Schematic DiagramsEach electrical schematic in this section is identified by a number that is both the figure number and thepage number. The numbers are assigned sequentially are prefixed by the letters SD. The electricalschematics and logic diagrams included in this section are listed in Table 4.4.1 on page 4.4.5.