Acquisition Controls
3-8
TDS3000B Serie s User Manual
Key Points
Vertical and Horizontal Preview. The vertical and horizontal preview
functions l et you change the vertic al and horizonta l c ontrols while
acquisition is stopped or while it is waiting for the next trigger. The
oscilloscope rescales and repositions the current acquisition in
response to the new control se ttings, and then uses the new settings
for the next acqui siti on.
Preview helps you optimize these control settings before the next
acquisition; this makes it easier to work with signals that are
single-shot or have a low repetition rate.
H For more information about vertical preview, see page 3--83.
H For more inform ation about horiz ontal preview, see page 3--36.
While acquisition is stopped you ca n make c hange s to ot her controls,
but those changes will only take affect with the next acquisit ion.
There is no preview for control changes other than the vertical and
horizontal controls.
The preview functions also do not affect automatic measurements,
cursor measurements, or the Math waveform. This data for these
functions i s always ba sed on the current acquisit ion. If you rescale or
reposition a channel waveform horizontally, it may not appear
time-correlated to the automatic measurements, cursor measure-
ments, or the Math waveform.
Acquisition Modes. You can choose one of four acqui sition modes:
Sample, Peak Detect, Envelope, or Average. The next two pages
describe these acquisition modes in detail.
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