3-2
IM DLM3054-01EN
Roll mode display
In roll mode, the displayed waveform is not updated using triggers. Rather, the oldest data is deleted as new
data is acquired, and the waveform flows from the right to the left of the screen. This mode is useful for observing
low-frequency signals or signals that change slowly.
About the roll-mode display
• The display is set to roll mode also when the trigger mode is set to single, but the roll mode display stops
when the instrument triggers.
• If the record length is 1.25 or longer, measured time values such as ΔT and Freq appear after you stop
waveform acquisition using the RUN/STOP key.
• If the record length is set such that waveform acquisition operates in single mode,* computed waveforms
(MATH waveforms nor automated measurement values of waveform parameters are not shown while
waveform acquisition is in progress. Waveforms and computed values are shown when a trigger occurs
and the roll mode display stops.
* The record length that causes waveform acquisition to operate in single mode varies depending on
whether a memory option is available. If no memory option is available, the record length is 25 Mpoints
or more. If the /M1 option is available, it is 50 Mpoints or more. If the /M2 option is available, it is 125
Mpoints or more.
• The instrument will not display computed waveforms that have been generated through user-defined
computation while it is acquiring waveforms. The instrument will display the computed waveforms after it
stops acquiring waveforms.
3 Horizontal Axis (Time Axis)
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