Rigol DS1204B Programming Manual page 26

RIGOL
Function:
The command sets the adjustment mode of vertical scaling of channel 3 as Fine
or Coarse. The vertical scale steps by 1-2-5 in Coarse; and by equality in Fine.
49. :KEY:CH3_POS_INC
Command Format:
:KEY:CH3_POS_INC
Function:
The command increases the vertical offset of channel 3 evenly.
50. :KEY:CH3_POS_DEC
Command Format:
:KEY:CH3_POS_DEC
Function:
The command decreases the vertical offset of channel 3 evenly.
51. :KEY:CH3_POS_Z
Command Format:
:KEY:CH3_POS_Z
Function:
The command adjusts the vertical offset of channel 3 to zero.
52. :KEY:CH4_VOLT_INC
Command Format:
:KEY:CH4_VOLT_INC
Function:
The command decreases the vertical scale of channel 4.
53. :KEY:CH4_VOLT_DEC
Command Format:
:KEY:CH4_VOLT_DEC
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Programming Guide for DS1000B Series