CONFIGURATION 
85 
Selecting the waveform update mode 
 
The display update mode is switched 
automatically or manually according to the 
horizontal scale. 
Updates the whole displayed waveform at once. 
The main mode is automatically selected when the 
horizontal scale (timebase) is fast. 
Updates and moves the waveform gradually from 
the right side of the display to the left. The Roll 
mode is automatically selected when the 
horizontal scale (timebase) is 50ms or slower. 
When in the Roll mode, an indicator appears at the 
bottom of the display. When in roll mode the 
record length is 2M (1 channel) or 1M (2 channel). 
Selecting the Roll 
mode manually 
1.  Press the Horizontal menu 
key. 
2.  Press Roll. The horizontal 
scale automatically becomes 
50ms/div and the 
waveform starts scrolling 
from the right side of the 
display (If the oscilloscope 
is already in the Roll mode, 
there will be no change).