The Autoset function automatically configures the 
panel settings to position the input signal to the 
best viewing condition. The GDS-2000A 
automatically configures the following parameters. 
  Horizontal scale 
  Vertical scale 
  Trigger source channel 
There are two operating modes for the Autoset 
function: Fit Screen Mode and AC Priority Mode. 
Fit Screen Mode will fit the waveform to the best 
scale, including any DC components (offset). AC 
priority mode will scale the waveform to the 
screen by removing any DC component. 
3.  To undo Autoset, press Undo 
Autoset from the bottom menu.