There are two ways to set the Y-axis range and position in a signal window: a fast method by
using mouse-wheel directly on a signal and a standard method by using axes settings dialog from
the context menu.
Fast axes settings by using mouse-wheel method
To use the fast Y-axis setting method, move your mouse pointer to the area between the left
edge of the signal window and Y-axis display. The mouse pointer will change to show a symbol
as on this screenshot:
Turning a mouse-wheel forward will zoom-in the Y-Axis around the current position of the small
arrow in the cursor pointer. Turning the mouse-wheel in the opposite direction will zoom-out the
Y-Axis. Again, the center position for this operation will be the position of the small arrow in the
If you press Ctrl button during the mouse-wheel moving, Y-axis will move up or down instead of
zooming-in or out.
Axes settings by using a dialog
Axes settings for signals can also be performed in Axes settings dialog, which appears after
selecting Edit/Axes settings option or pressing Ctrl+A on an active signal window. There are
several fields in this dialog:
Max & Min fields are used for setting the Y-axis range. You can enter your own values manually
in corresponding edit boxes or you can change the values by pressing up/down arrow keys on the
Auto button sets values in min/max fields to actual min/max values from the signal.
Fixed min/max (no auto-scale) check box: unselect it if you want to keep Y-axis settings for this
signal even when signal values change. If you select this check-box, SIGVIEW will not calculate
new min/max values for the graphic’s Y-axis automatically each
time the signal changes.
Instant preview in signal window check box: select it if you want signal axes to redraw while
you change minimum or maximum values in this dialog. This can be a slow operation for long
Show axes check box: select it if you want to see coordinate system with X and Y axes and
labels. Drawing signal only, without the axes, can speed-up the signal redrawing in cases where
performance is very important.
X/Y Labels: a text which appears at X and Y axes (usually units like Hz, s,...)
Logarithmic X-Axis: If this option is selected, the X-Axis will be shown as logarithmic axis, i.e.
the distance between data points will increase logarithmically from left to the right side of the
displayed part of the signal. By using this view on an FFT result, lower frequency components will
take more space, and the higher frequencies will be shown “compressed” at the right side of the
Logarithmic Y-Axis: If this option is selected, the Y-Axis will be shown as logarithmic axis, i.e.
the distance between data points will increase logarithmically from zero amplitude in positive or
This is an example of a spectrum with log-log display, i.e. both X and Y logarithmic axes:
It is also possible to switch Logarithmic X/Y axis on or off from the context menu on each