Page 112 - Make Your Own PCBs with EAGLE from Schematic Designs to Finished Boards

FIGURE 4-27 Using the Information command to change the net class.

This completes the connecting up of the nets. The next step is to validate the schematic using the
ERC.

Running the ERC

Before we start on the layout, we need to run the ERC. This will tell us about any problems in the
schematic. It is important to understand that the ERC does not simulate our circuit; if the design is
wrong, it will not tell us that it is wrong. It basically just checks that there are no dangling

connections that have been missed or any nets that run too close to each other.
It is surprisingly easy to create a schematic in EAGLE that looks like everything is connected just
fine, but it turns out that there are some connections that do not quite meet.

Launch the ERC, either from the Tools menu or from the ERC command, bottom left of the
Command bar. The result should look like Figure 4-28. The ERC is very helpful because if you select
an item on the list, it will highlight the relevant area on the schematic.