Zoom
TDS 420A, TDS 430A, TDS 460A & TDS 510A User Manual
3–145
Only the selected
waveform (the bottom one)
changes size
Figure 3–79: Zoom Mode with Horizontal Lock Set to None
To set the offset in time of the second zoomed waveform from the first, press
ZOOM
➞ Mode (main) ➞ Dual Zoom Offset (side). Then turn the general
purpose knob to set the offset.
Dual zoom offset is always positive. The oscilloscope sets the offset as close to
the requested value as possible. An offset request of 0.0 insures that the zoom
boxes are butted against each other, regardless of the zoom factor.
Zoom Preview draws a box around the zoomed portion(s) of the unmagnified
selected waveform. It also displays both the magnified and unmagnified
waveforms in separate half-height graticules (see Figure 3–80). To preview
zoom, press Zoom
➞ Mode (main) ➞ Preview (side).
In preview mode, the zoom magnification factors are not displayed. However,
scale factors for the zoomed waveform are displayed.
To select which waveforms are controlled by the horizontal and vertical scale and
offset controls, indicated by “photo-corners” on the graticule corners containing
the waveforms (see Figure 3–80), press Selected Graticule
(main) ➞ Upper or
Lower
(side).
To Set Dual Zoom Offset
To Preview Zoom
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