05 Domains and Axes

Impulse displays waveforms using different domains (e.g. time, frequency). Time (etc.) is defined as the domain class. The actual domain later gets a magnitude, depending on the class and possibly being milliseconds, hours, seconds, nanoseconds etc..

Adding a magnitude is necessary to show a real physical value, because there are only integer values defining the signals domain values without it. You can change these settings in the configuration dialog.

When you open a file in Impulse it is possible that it contains signals with different domains. You can still all show them in one graph. In the graph on the right the axis of the signal you selected is used, for example if you select a file that has a time domain the axis will show nanoseconds or another measurement of time. Those signals whose axis is displayed look normal and those whose axis is not shown are colored in a light gray. Furthermore you can see which domain is displayed when you look at the cursor. It is only shown in color at those signals that come from the domain which is used in the axis. With all other signals it is displayed only with white lines.

If you have signals from the same domain but nevertheless want to show them on a different axis (e.g. to see the total and a snippet side-by-side) you have to create a new folder for the selected signals. To create a folder you right click the configuration, choose add and then folder. In the dialog that now opens you click dedicated axis and then add signals via drag and drop to the folder. Now you can vary the way those signals are displayed from the rest, for example you can zoom in and out to have a general overview over the signal and a closed up view of a part of it.A ruler is added to the folder icon when you set the dedicated axis.


There are two types of axis. One is the linear which is the normal case and the other is log10. When you choose log10 the value appears in the same intervals but increases tenfold.

There are four ways to move your axis. When you click the axis and hold it you can move it to see different parts of it. You can also use the scroll bar to move the axis. Furthermore you can move the axis by clicking into to graph and by using shift and the wheel.

To zoom in or out you can use control and the wheel, the icons in the toolbar in the upper right corner or zoom fit.

In the upper axis you can see in which domain areas your signals are. The color of this area is a dark gray. When you move the axis there is a light gray bar showing the maximum domain area.

Configuration dialog

With the configuration dialogue you can choose settings for the domain axis and the domain base. There are two different modes you can use as domain base. The default setting is Use signal domain base. The programme determines a domain base from the signal. If you don't want the determines domain or there is none you click Override domain base with. There you have to set a domain base yourself.

Folder dialog

The folder dialog is similar to the configuration dialog. You have three domain axis you can choose from. No dedicated axis is default and the global axis is displayed, Dedicated axis is the setting you choose when you want an axis especially for this folder which are independent from the other axis and Dedicated axis with overriding domain base is the setting you choose if your axis should be independent from the others and you also want to set the domain base.