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User Manual 35
Use the Zoom Function
Zoom is a horizontally expanded version of the normal display. You can use Zoom to
locate and horizontally expand part of the normal window for a more detailed (higher-
resolution) analysis of signals.
Press the HORIZONTAL Scale Knob on the front panel to turn on the zoom function, and
press the button again to turn off the function. When Zoom function is on, the display
divides in half. The top half of the display shows the normal time base window and the
bottom half displays a faster Zoom time base window.
Normal time base Zoom time base
The area of the normal display that is expanded is outlined with a box and the rest of the
normal display has a grey mask. The box shows the portion of the normal sweep that is
expanded in the lower half.
To change the time base for the Zoom window, turn the Horizontal Scale Knob . The
Horizontal Scale Knob controls the size of the box. The Horizontal Position Knob sets
the left- to- right position of the zoom window. The delay value, which is the time displayed
relative to the trigger point is momentarily displayed in the upper- right corner of the
display when the Horizontal Position Knob is turned. Negative delay values indicate
you're looking at a portion of the waveform before the trigger event, and positive values
indicate you're looking at the waveform after the trigger event.
To change the time base of the normal window, turn off Zoom; then, turn the Horizontal
Scale Knob .