If you have your "Samples to include" set to 0, then you're telling it to show the entire time period in the upper graph. To get it to zoom in on any sub-piece, you need to set your Samples to include to something other than 0. Normally, I set it to a number the encompasses the "bad" period I'm trying to highlight to my ISP (this could be 10, 100, or 8000 - depending on how long the period is, and how fast your repeat rate is.<br><br><br>