Median Operator
The Median math operator stores (in the function) the median waveform value acquired for each time bucket in the source. You can specify the number of past time bucket values used to determine the running median value. Click on the operator icon to open the Median Setup dialog. The default number of past time bucket values to include in the median is 16.
The Median 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 median value results are recalculated when any of the following occurs:
- Time base scale, position, or reference is changed
- Channel scale or channel offset is changed
- Trigger definition is changed
- Record length is changed
- Additional data is stored to a waveform memory that is used as part of a function
- Clear on the menu bar is clicked
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.