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Waveform data outside of the vertical acquisition window is clipped; that is, the data is limited to
the minimum or maximum boundaries of the vertical acquisition window. This causes
inaccuracies in amplitude-related measurements. For more information see Vertical Acquisition
Window Considerations on page 229.
Acquired waveform
Adjusted Horizontal
Scale
Set horizontal scale, position, and resolution (record length) so that the acquired waveform record
includes the waveform attributes of interest with good sampling density on the waveform. These
settings define the horizontal acquisition window, described in Horizontal Acquisition Window
Considerations on page 231.
Note
The terms vertical acquisition window and horizontal acquisition window refer to the vertical and
horizontal range of the segment of the input signal that the acquisition system acquires. The terms
do not refer to any display windows on screen.
Vertical Acquisition Window Considerations
You can set the vertical scale, position, and offset of each channel independently of other
channels. Vertical scale and offset specify the vertical acquisition window for each channel. Parts
of the signal amplitude that fall within the vertical window are acquired; parts outside (if any) are
not.
The offset control subtracts a constant DC level from the input signal before the vertical scale
factor is applied, and the vertical position control adds a constant number of divisions of signal
after the scale factor is applied to the resulting difference.
The vertical scale and position controls have the following affects on the vertical acquisition
window and the displayed waveform:
 The vertical volts per division that you set determine the vertical size of the acquisition
window, allowing you to scale it to contain all of a waveform amplitude or only part. Figures
A and B below show two vertical acquisition windows that contain the entire waveform, but
only the window in Figure B contains the entire waveform in the graticule on screen.
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