Documentation

Simulation - Define Probe

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Use this when editing a Part to define the Part as a Probe.

Use this on Fixed Probe component(s) in a schematic design to change their plot settings.

These parts have their Spice Type Built-in Function set to one of the five Probe types.

Shortcuts

Default Keys: F7

Default Menu: Simulation

Command: Edit Spice Value/Model

How To Add A Fixed Probe

Once you have a circuit that you wish to simulate, add fixed probes to it to instruct the simulator to plot graphs for the selected voltages and/or currents.

There are various ways to add a Fixed Probe to a Schematic Design:

  1. From the Parts toolbar, click on the Probes pop-up to display the Probes toolbar. Click on the Voltage Probe, Current Probe, Differential Voltage Probe, dB Probe or Phase Probe buttons.
  2. From the Simulation menu, use the Insert Fixed Probe option and choose the required probe from the sub-menu.
  3. From the Parts Browser, click on the Probes category to display a list of parts. Drag the any of the part names mentioned in method 1 above, into the design. Note: This method may not work if you have changed the part categories.
  4. Use Component from the Insert menu to add Parts with the names mentioned above in method 1, from the SPICE library.

Whichever method is used, you should be presented with a Probe component to place in the design. Place the Current probe by dropping it on the required device pin. Place one of the Voltage probes by dropping it on any net. Place the Differential Voltage Probe by dropping it into space on the design and wiring up the two pins to the two nets that the voltage is to be measured between.

Another approach is to randomly probe the circuit after the simulation run is complete. See Random Probing for details of this procedure.

How To Define A Probe’s Plot Settings

In a Schematic Design, select the Probe device(s) that you wish to change. Press F7 or use the Edit Spice Value/Model option from the Simulation menu, or from the shortcut menu.

From a Parts Library edit the required Part. Press the Edit Spice button on the Details tab. Make sure the Built-in Function is set to one of the Probe types and press the Edit Value button.

In both cases the following dialog will be displayed:

Click on one of the links below for details of the relevant probe page.

Options ����Axis Scales ����Axis Labels

AC Sweep Analysis | Digital Pulse | Edit Device Type | Noise Analysis | Random Probing

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