RIGOL MSO/DS1000Z Series - Manual (Page 56)

RIGOL Chapter 2 To Set the Vertical System
2-4 MSO1000Z/DS1000Z User’s Guide
Waveform Invert
Press CH1  Invert to turn on or off waveform invert. When waveform invert is
turned off, the waveform display is normal; when waveform invert is turned on, the
waveform voltage values are inverted (as shown in the figures below).
(a) "Invert" Off (b) "Invert" On
Figure 2-1 Waveform Invert
Vertical Scale
Vertical scale refers to the voltage value per grid in the vertical direction on the
screen and is usually expressed as V/div.
Press CH1 and rotate VERTICAL SCALE to adjust the vertical scale (clockwise
to reduce the scale and counterclockwise to increase). The size of the displayed
waveform will be changed accordingly. The scale information (as shown in the figure
below) in the channel label at the bottom of the screen will change accordingly
during the adjustment. The adjustable range of the vertical scale is related to the
probe ratio currently set. By default, the probe ratio is 10X and the adjustable range
of the vertical scale is from 10 mV/div to 100 V/div.
The vertical scale can be adjusted in "Coarse" or "Fine" mode. Press CH1 
Volts/Div to switch the adjustment mode.
 Coarse adjustment (take counterclockwise as an example): set the vertical scale
in 1-2-5 step namely 10 mV/div, 20 mV/div, 50 mV/div, 100 mV/div…100 V/div.
 Fine adjustment: further adjust the vertical scale within a relatively smaller
range to improve vertical resolution. If the amplitude of the input waveform is a
little bit greater than the full scale under the current scale and the amplitude
would be a little bit lower if the next scale is used, fine adjustment can be used
to improve the amplitude of waveform display to view signal details.
Note: You can also press VERTICAL SCALE to quickly switch between "Coarse"