52 Keysight InfiniiVision 2000 X-Series Oscilloscopes User's Guide2 Horizontal ControlsNote that the horizontal position knob has a different purpose in the Zoom display.See “To display the zoomed time base" on page 56.Panning and Zooming Single or Stopped AcquisitionsWhen the oscilloscope is stopped, use the horizontal scale and position knobs topan and zoom your waveform. The stopped display may contain severalacquisitions worth of information, but only the last acquisition is available for panand zoom.The ability to pan (move horizontally) and scale (expand or compress horizontally)an acquired waveform is important because of the additional insight it can revealabout the captured waveform. This additional insight is often gained from seeingthe waveform at different levels of abstraction. You may want to view both the bigpicture and the specific little picture details.The ability to examine waveform detail after the waveform has been acquired is abenefit generally associated with digital oscilloscopes. Often this is simply theability to freeze the display for the purpose of measuring with cursors or printingthe screen. Some digital oscilloscopes go one step further by including the abilityto further examine the signal details after acquiring them by panning through thewaveform and changing the horizontal scale.There is no limit imposed on the scaling ratio between the time/div used toacquire the data and the time/div used to view the data. There is, however, auseful limit. This useful limit is somewhat a function of the signal you areanalyzing.To change the horizontal time mode (Normal, XY, or Roll)1 Press [Horiz].2 In the Horizontal Menu, press Time Mode; then, select:NOTE Zooming into stopped acquisitionsThe screen will still contain a relatively good display if you zoom-in horizontally by a factor of1000 and zoom-in vertically by a factor of 10 to display the information from where it wasacquired. Remember that you can only make automatic measurements on displayed data.
