Nautel VS300 Troubleshooting Manual

Also see for VS300: Quick start guide Installation manual Operation and maintenance manual Preinstallation manual Troubleshooting manual

Nautel VS300 Troubleshooting Manual Manual pdf 82 page image

VS300 Troubleshooting Manual Reading Electrical SchematicsPage 5-2 Issue 10.0 2019-01-18Unique symbolsNautel uses unique symbols on electrical schematics to describe logic (two-state) signals. Thesesignals differ 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 areprefixed with 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. Thehigh suffix (+) 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. Inpositive logic, high represents the active (true) state, and low represents the inactive (false) state.In negative logic, 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 figurenumber and the page number. The numbers are assigned sequentially are prefixed by the lettersSD. The electrical schematics and logic diagrams included in this section are listed in Table 5.1on page 5-4.