.. index:: Signal Inspector panel, 

.. _signal-inspector-label:


Signal Inspector
++++++++++++++++

Activate the :ref:`pixel-inspector-label` in the :ref:`image-toolbar-label`,  and left-click on a point in either the ``Amplitude`` or  ``Phase`` image to select a pixel (right-click to de-select).  The data from this pixel is moved to the :ref:`data-tree-label` and the ``Signal Inspector`` panel opens where you can see the tip motion durring the selected pixel time.  You can display the motion in the following ways:

* ``Time`` signal shows a very dense plot of fast oscillations with a slowly varying amplitude envelope.  Zoom is required to see the individual oscillation cycles.

* ``Spectrum`` shows only the amplitude of the individual intermodulation frequency components, ploted on a log scale.  The component which is plotted with a thicker line corresponds to the amplitude and phase image displayed.  You can click on different componets in the plot, and the amplitude and the images will change to the amplitude and phase of that frequency component.