Zoom
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TDS 420A, TDS 430A, TDS 460A & TDS 510A User Manual
To Zoom a Waveform (TDS 400A Only)
To use Zoom, select a waveform, turn zoom on, and magnify it using the vertical
and horizontal scale knobs:
1. Press any of the waveform selection buttons (CH 1 through CH 4) on the
right side of the display. Or press MORE and select a math or reference
waveform from the More menu.
2. Press ZOOM
➞ Mode (main) ➞ ON (side). The ZOOM front-panel button
should light up.
3. Adjust the vertical zoom factor for the selected waveform using the vertical
SCALE knob. Adjust the vertical position of the zoomed waveform using
the vertical POSITION knob.
4. Adjust the horizontal zoom factor using the horizontal SCALE knob. Adjust
the horizontal position of the zoomed waveform using the horizontal
POSITION knob.
5. Press ZOOM
➞ Lock (main) ➞ All, Live, or None (side) to choose which
waveforms to zoom:
None — only the waveform currently selected can be magnified and
positioned horizontally (Figure 3–79).
Live — all “live” (as opposed to reference) waveforms can be magnified and
positioned horizontally at the same time. If a reference or math waveform is
selected, only the selected waveform is magnified and positioned.
All — all waveforms displayed (live, math, and reference) can be magnified
and positioned horizontally at the same time.
NOTE. Although zoom must be turned on to control which waveforms zoom
affects, the setting for Lock affects which waveforms the horizontal control
positions whether zoom is on or off.
To select between waveform zoom and dual waveform zoom, press ZOOM
➞
Mode
(main). Then press Dual Zoom (side) to toggle Dual Zoom OFF or ON.
NOTE. Dual zoom displays a second zoomed view of the selected unzoomed
waveform. The second zoomed view is offset in time from the first zoomed view.
Also, zoom must be enabled (On or Preview) to see the dual zoom displays.
Select Zoom or Dual Zoom
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