TDS 420A, TDS 430A, TDS 460A & TDS 510A User Manual
3–99
Roll Mode (TDS 400A Only)
Roll mode lets you see acquired data points without waiting for the acquisition
of a complete waveform record. For example, when a sweep is 10 divisions long
and the sweep rate is 1 second per division, 10 seconds are required to fill the
waveform record. Without roll mode you must wait 10 seconds to see that the
position control is set wrong. With roll mode you can start seeing results almost
immediately.
Roll Modes
The four roll modes (see Figure 3–53) are described below.
Use untriggered roll to continuously observe a slow process, knowing that you
can always see the most recent view of that process.
Use untriggered roll with single sequence to observe data for later viewing. For
example, at 20 seconds per division at 30K record length there are 60 screens,
600 divisions, and 12000 seconds of acquired data points. Untriggered roll with
single sequence would capture data over a lunch hour and hold it for later
viewing.
Use triggered roll to capture a succession of triggered events in normal interac-
tive debugging.
Use triggered roll with single sequence to capture one triggered event.
To Turn On Roll Mode
Do the following steps to turn on roll mode:
1. Press HORIZONTAL MENU
➞ Horiz Controls (main), and set Roll
Mode
(side) to Automatic to enable roll mode.
Untriggered Roll
Untriggered Roll with
Single Sequence
Triggered Roll
Triggered Roll with Single
Sequence
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