HP 54522A - Page 59

Harizontal
Pan and Zoom
Pan and Zoom
The normal running mode displays 500 points on the screen. But when the
scope is stopped, you can observe any portion or all of the waveform record
by using pan and zoom. The pan and zoom feature performs the same
function as the time base windowing feature used in many digitizing
oscilloscopes. The pan and zoom feature is available in the real-time
acquisition mode and is operable only when the acquisition is stopped.
Applications that require precise evaluation of low-repetition-rate signals,
such as radar and transponder pulse trains, are simplified by zooming and
panning on single-shot data.
Zooming either expands or compresses the acquired waveform on the
horizontal axis of the display. It is controlled by the time/div controls, and it
is used for expansion or compression of a single-shot waveform in the
real-time mode. Increasing time/div compresses the waveform and is
referred to as "zooming out." Because you can acquire record lengths up to
32,768 and the display is limited to 500 points when the scope is running, you
may find situations when zooming out that up to 65 sample points can be
mapped to one pixel column. Decreasing time/div expands the waveform and
is referred to as "zooming in."
Panning is moving the acquired waveform horizontally on the display. It is
controlled by the time base delay controls. Increasing delay moves the
waveform to the left and decreasing delay moves the waveform to the right.
By observing the memory bar, you can tell what portion of the memory is
being displayed.
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