ETS_theory.asciidoc

@@ -62,6 +62,18 @@ image::https://es.technikum-wien.at/openlab/openlab_wiki/wikis/img/ETS_theory/ET
 
 By accumulating the taken samples of the periodic waveform, the original signal can be reconstructed and displayed on the oscilloscope screen. The first sample is taken at time t.
 The next sample will be taken at the same time t but delayed by a constant value delta t. The upcoming sample will be taken at t + (2 * delta t) and so on.
+This method needs a reference point which synchronises the time when the ADC has to capture a sample.
+This reference point is, depended on the implementation of the ETS mode, given by the trigger system or an internal clock.
+
+{empty} +
+
+A detailed description of how the ETS mode works is given by the upcoming sub-chapters. ETS can be implemented in several ways each with their own advantages and disadvantages.
+This wiki will describe the two most common ETS methods:
+
+* Sequential Equivalent Time Sampling
+* Random Equivalent Time Sampling
+
+{empty} +
 
 == Bibliography