58 Keysight N778xC Series Polarization Instruments User’s Guide
4 User Interface Reference
The Trace Mode
In Trace mode, data is sampled and stored only if the SOP has changed by
a certain amount. The sensitivity can be adjusted by the ”Trace
Sensitivity” value. A value of 0.02 degree will record a new SOP when the
normalized SOP has changed by more than 0.02 degree on the Poincaré
sphere. The displayed buffer operates like a FIFO (first-in-first-out) buffer.
Thus the oldest SOPs are discarded when new SOPs are stored. The
number of SOPs stored is controlled by the Trace data points value.
Graph Views
Graph views are used to display the normalized Stokes parameters, the
DOP and the power versus time. Click SOP-Time to select the graph view.
Use the mouse (or touch pen) to zoom into the plot by clicking and
drawing a rectangle. Click on Zoom out button on the graph area to reset
the zoom. Select a datapoint to view the labels on the graph.
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