Acquiring and Displaying Waveforms
3–54
TDS 500D, TDS 600B, & TDS 700D User Manual
The method the oscilloscope uses to interpolate, linear or sin(x)/x, can affect the
way Zoom displays your waveform. If you selected sin(x)/x (the default), it may
introduce some overshoot or undershoot to the waveform edges. If such is the
case, change the interpolation method to linear, following the instructions on
page 3–56.
To read about the two interpolation methods, see Interpolation on page 3–30. To
differentiate between the real and interpolated samples, set the display style to
Intensified Samples. (See Select the Display Style on page 3–41.)
To quickly determine the zoom factor of a zoomed waveform, select it and check
the Zoom readout. It shows the selected waveform by number, along with the
horizontal and vertical expansion factors.
The Zoom readout appears at the top of the display when zoom is on. (See
Figure 3–25 on page 3–56.) Dual-window (preview) mode does not display the
Zoom readout.
To use Zoom, select a waveform, turn Zoom on, and magnify that waveform
using the vertical and horizontal scale knobs:
1. Press any of 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.
Press ZOOM ➞ Mode (main) ➞ ON (side). The ZOOM front-panel button
should light up. Toggle Dual Zoom to OFF in the side menu.
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.
Checking the Zoom Factor
Zoom a Waveform
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