Horizontal and acquisition setups Select a s ampling mode
Roll mode lets you see acquired data without waiting for the acquisition of a complete waveform record.
It gives you immediate feedback. For slow time bas e settings, Roll m ode provides a rolling display
similar to a strip-chart re corder.
To use
The resolution appears near the lower-right corner of the graticule and is controlled by the Resolution
knob.
Use Untriggered Roll Mode to continuously observe a slow process. Apply math and measurement
operations after you stop the acquisition.
When Roll mode is on, the Acquisition Status Indicator Readout displays Roll.
Behavior
When using Roll mode, you do not have to wait for slow acquisitions to fill the display. When Roll mode
is enabled, the instrument displays newly acquired data points at the right edge of the display while
moving the older waveform data points to the left.
Using single sequence with roll mode causes the acquisition to automatically stop after a complete
waveform record is acquired. Roll mode is useful when observing a slow process where you always want
to see the most recent v iew of that process. Roll mode with single sequence is useful to save data for later
viewing. For example, at 20 seconds per division and 30 K record length, there are 12,000 seconds
of acquired data points.
ThemaximumrecordlengthwhereRollmodeisallowedis10M.
What do you want to do next?
Learn how Roll mode interacts with other instrument settings. (see page 845)
Learn about Equivalent Time
mode.
(see page 189)
Select a sampling mode
From the Horiz /Acq menu, select Sampling Modes, or select a sampling Mode in the Acquisition tab of
the Horizontal/Acquisition control window
(see page 181).
DSA/DPO70000D, MSO/DPO/DSA70000C, DPO7000C, and MSO/DPO5000 Series 189
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