The chart is empty after a run
A run that finishes without traces usually has no probes, no time axis, or a chart mode that cannot draw those results.
Britt Espinosa
Last Update 15 days ago
The run finished, the status went back to Ready, and the Chart panel shows nothing. Four different situations produce a blank chart, and the panel itself tells you which one you are in.
The messages you may see
No simulation results
Run a simulation to view the results in a chart.
No chart for operating point
Operating-point results have no sweep or time axis. Open the table to view each probe value.
Selected chart mode is not compatible with these results
And, as a classified issue titled The simulation produced no usable results:
The run finished without a connected signal that CircuitSim could display.
You ran a DC operating point
An operating point produces one set of steady state numbers with no axis to plot them against, so the chart has nothing to draw by design. Turn on the Table panel instead. You get a row for each node voltage and each component current.
Nothing is probed
The simulator only reports the signals you asked for. With no probes on the schematic, the run completes and returns nothing to display. The steps on the issue are:
- Connect at least one voltage, current, or digital probe to the circuit.
- Check that the probed branch is connected to components included in the simulation.
- Run the simulation again.
A probe placed near a wire rather than on it counts as unprobed. The netlist warnings flag this case:
A probe is not connected to a usable circuit branch and will not produce results.
The chart mode does not fit the results
Each analysis has chart modes that suit it. Picking a fixed mode and then changing the analysis can leave the two mismatched, which shows the incompatible mode overlay:
This simulation cannot be plotted with the current Digital chart mode. The recommended chart mode for these results is Mixed Signal.
The overlay offers Switch to Auto and a button for the recommended mode. Auto picks a suitable chart for whatever the run produced, which is the setting to keep unless you have a reason to override it.
The series are hidden or scaled off screen
Open Chart settings from the chart toolbar. In the Series section, confirm the traces you expect are visible. In the axis sections, turn Auto scale on, or use Zoom extents in the toolbar to fit the data back into view. A manual Min and Max left over from an earlier run can park a valid trace outside the visible window.
If the chart is still blank
Check the Status tab of the Info panel. A run can complete and still report a warning such as Some simulation results could not be displayed, which means a probe or an expression output could not be updated. The Log tab shows the raw simulation output, including any SPICE diagnostics that never made it to a toast.