Spectrum Software
Industrial Strength Simulation




Spectrum Software has released Micro-Cap 11, the eleventh generation of our SPICE circuit simulator.

For users of previous Micro-Cap versions, check out the new features available in the latest version. For those of you who are new to Micro-Cap, take our features tour to see what Micro-Cap has to offer.




Analysis Plot Labels


When stepping parameter values you will usually see an array of curves. How do you tell which curve goes with which stepped value? You could invoke Cursor mode and use the up and down arrow keys to cycle through the curves and watch the plot title reveal the stepped values. If you want a more permanent delineation you can use labels. Here's a stepped plot without labels:

Labeling the plot branches

You can add labels that show the stepped values for each curve as follows. From the Scope menu select Label Branches. This will display the Labels dialog box as shown below:

Labels dialog box

Click on the Automatically selected location option, then click on the OK button. This tells the program to automatically select the label's X location based on the maximum vertical separation between curves. This is usually close to optimal. If the selected location is a little off you can use the User selected location by specifying the X coordinate for the labels. The next figure shows what the auto option produces.

_Labelled plot branches

Here is the plot with User selected location set to 4e6. The location is in the units of whatever is plotted horizontally, in this case frequency.


Branch labels are just text. Once placed they can be moved about, or as in this case, selected and deleted to make room for the User selected location option.

Note that the color of the labels is initially the same as the waveform. Once placed the label color can be changed. To do this you drag select the set of labels using the Select tool. Then you click on the Color and or Font buttons to select a new font, size, and/or color. Here, for example, is the same run with the font set to green 20 point Comic Sans.


Here are some things to remember when using branch labels.

1) Branch labels are ordinary text. Once placed they can be individually edited or deleted.

2) Branch labels are placed so that the text 'hangs down' from the specified X,Y point. The X coordinate of the point is either automatically computed or entered by the user. The Y coordinate is the curve's Y value at the specified X coordinate.

3) To quickly remove a set of labels, use CTRL+A to select all, then press the Delete key. This action deletes all plot artifacts, including text and tags. To delete one set of labels, use the Select mode and drag select the labels and then press the Delete key.

Download Winter 2013 Circuit Files
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