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Using Electrical Rules Checking in National Instruments Multisim

Module by: Janell Rodriguez, Erik Luther

Summary: This module provides a brief introduction to using electrical rules checking in National Instruments Multisim. Multisim is fully featured SPICE schematic capture and simulation tool used for circuit design, simulation, and in combination with Ultiboard for layout of custom PCBs.

Electrical Rules Check (ERC)

The Electrical Rules Check creates and displays a report detailing connection errors (such as an output pin connected to a power pin) and unconnected pins. Once the circuit is wired, check the connections for correctness based on the rules set up in the Electrical Rules Check dialog box.

Depending on your circuit, you may wish to have warnings issued if some types of connections are present, error messages for other connection types, and no warnings or errors for other connections. You control the type of connections that are reported when ERC is done by setting up the rules in the grid found in the ERC Rules tab of the Electrical Rules Check dialog box.

ERC may be run over an entire design, or only across certain areas of a design. When an ERC is run, any anomalies are reported into a results pane at the bottom of the screen and the circuit is annotated with circular error markers. Clicking on an error will center and zoom on the error location.

The ERC Options tab and ERC Rules tab are used to configure the ERC.

To run the electrical rules check:

1.Select Tools/Electrical Rules Check to display the Electrical Rules Check dialog box.

2.Set up the reporting options using the ERC Options tab (Figure 1).

3.Set up the rules using the ERC Options tab (Figure 2).

4.Click OK. The results display in the format selected in the Output box in the ERC Options tab.

Figure 1: ERC Options Tab
Figure 1 (Graphic1.png)
Figure 2: ERC Rules Tab
Figure 2 (Graphic2.png)

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