Choose SOP Change if you want to trigger on a changing SOP. You canset the sensitivity by pressing on the Sensitivity button. In the examplebelow, a trigger event is detected when the SOP changes by at least 3degree on the Poincar´e sphere within a time interval of 10 ms. Note thatyou could achieve the same sensitivity by choosing different values (e.g.1,5 deg and 5 ms). However this may cause false trigger events due tomeasurement noise.You will find the trigger parameters in the Sampling Settings section. Inthe External PC Mode the SOP Change parameters, like angular sensi-tivity are accessed by pressing the Sensitivity button, which will show up,when the SOP Change mode is active. In the Integrated PC Mode theyare located in the SOP Change section. You can also set the number ofsamples to be stored from right before the SOP change event (Pre-Trig.Samples) and right after the SOP change event (Post-Trig. Samples).6.1.6 The Trace ModeIn Trace mode data is sampled with a fixed sampling rate of 2.5 kHz andstored only if the SOP has changed by a certain amount. The displayedbuffer operates like a FIFO (first-in-first-out) buffer. Thus the oldestSOPs are discarded when new SOPs are stored. The number of SOPsstored is controlled by the Post-Trig. Samples value. Switch to theStokes-window and change the input polarization to see how SOPs arestored in this mode. You can clear the current trace by choosing ClearMeasurement from the Edit menu or by pressing F2.36 A1XXX/A2XXX/A3XXX User Guide
