Summation Operator
The Summation operator's output is the cumulative sum of the current and all previous (in time) input values.
If the input data sequence is denoted as x[n], the output sequence is denoted y[i], and n is an integer that goes from 0 to N (N being the number of total points in the record), then:
An example if x[n] = {3, 2, 14, 5, 23, 10, 5}, then y[n] = {3, 5, 19, 24, 47, 57, 62}
The Summation operator is designed for a single-valued waveform, as opposed to an eye diagram. Be sure that your trigger setup results in a single-valued waveform at the input to this operator. This can be acheived using an external pattern trigger or by using pattern lock. If you are using an external pattern trigger, you may ignore this note.
The Summation operator is not available in Jitter mode.
The operator's Display Setup configures the manner in which the resulting waveform is displayed including both vertical and horizontal scaling. Track selection to allows the output waveform to track changes to the scaling of the input waveform. Track is the default setting. In addition, you can turn the waveform's display off or on and select the color of the trace.
Use the Name button to give the displayed waveform a custom identifying name which is show in the Signals area on the display graticule and in the Signals palette. Custom names are very helpful for screen captures or when multiple waveforms are displayed.
The Graph Window is available when multiple waveform content windows are used.
Use the Signal Type's Track selection to allows the waveform type (NRZ or PAM4) to track the input waveform's type. Track is the default setting. If input waveform's type cannot be automatically determined, select Manual to specify the waveform type.