Display Logical Designators - choose this option to display the logical designators.Physical designators are unique, e.g., R1_CH1. For multi-channel designs, designator format is determined by the Designator Format field on the Multi-ChannelВ tab of the Options for Project dialog. These are the designators displayed on the compiled tab views of the schematic source documents. Display Physical Designators - choose this option to display the physical designators.Use this field to determine how designators are to be displayed. This would, of course, necessitate some other notation being added to the board to indicate the separate channels, such as a box being drawn around each channel on the component overlay. For example, C30_CIN1 would display as C30. As well as choosing a naming option that results in a short name, another option is to display just the original, logical component designation instead. It can be difficult to position the designator strings in a multi-channel design since they can end up being quite long. The measurement unit employed for the board can also be changed directly from the Ribbon menus using the and buttons in the Home | Grids and Units region. Default units are used to display any distance related information on screen or in reports. Click to select from either metric (mm) or imperial (mil) units. Unit - select the default measurement units for the current PCB document.PCB Library Editor - click Home | Board | from the main menus or right-click in the workspace then use the Options В» Library Options command from the context menu.PCB Editor - click Home | Board | from the main menus or right-click in the workspace then use the Options В» Board Options command from the context menu.The dialog can be accessed from both the PCB Editor and PCB Library Editor: They can, therefore, collectively be thought of as local-level options rather than global options (that are set for all PCB documents in the Preferences dialog). The Board Options dialog provides a range of options, including measurement units, sheet display, and snap settings, that affect only the active PCB document.

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