What does VARIABLE feature do on DL750?

What does VARIABLE feature do on DL750? 
 
In terms of using VARIABLE on your input channel;
it is a display-value feature - not a resolution feature.

the A/D on the front-end still uses the V/Div which you had previously set.
 
Here is a different approach:
Divide your signal’s Vpp by 20 divisions; and be sure to adjust your V/Div no-higher-than that value.

Now, your waveform will be off-screen a bit, by as much as 10 divisions-worth of waveform that you cannot see;

No problem, simply adjust the V Zoom to a value less than X1. This keeps the A/D in the best resolution mode; and, this will improve your SNR (ratio). 
 
You may also use the VARIABLE feature after you setup according to 20 input divisions (veritcal).

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