Chapter 3 To Set the Horizontal System    RIGOL 
DS2000E User’s Guide    3-7 
Roll Mode 
 
In this mode, the waveform scrolls from the right to the left to update the display. 
The range of horizontal scale adjustment is from 200.0 ms/div to 1.000 ks/div.  
 
Note: When Roll mode is enabled, the waveform "horizontal position", "Delayed 
Sweep", "Protocol Decoding", "Pass/Fail Test", "Measurement Range", 
"Waveform Record", "To Set the Persistence Time" and "To Trigger the 
Oscilloscope" are not available.  
 
Slow sweep is another mode similar to Roll mode. In Y-T mode, when the horizontal 
time base is set to 200 ms or slower, the instrument enters "slow sweep" mode in 
which the instrument first acquires the data at the left of the trigger point and then 
waits for trigger event. After the trigger occurs, the instrument continues to finish 
the waveform at the right of the trigger point. When slow sweep mode is used to 
observe low frequency signal, it is recommended that the "
Channel Coupling" is