Select operation modes of CH 1 and CH 2 amplifiers:
CH 1 : The oscilloscope operates as a single-channel instrument and
only CH 1 is displayed.
CH 2 : The oscilloscope operates as a single-channel instrument and
only CH 2 is displayed.
DUAL : The oscilloscope operates as a dual-channel instrument with
both CH 1 and CH 2.1
CHOP/ALT are automatically changed by
TIME/DIV switch. When CHOP (41) button is pushed in, the two
traces are displayed in the CHOP mode at all ranges.
ADD : The oscilloscope displays the algebraic sum (CH 1+CH 2) or
difference (CH 1-CH 2) of the two signals. The pushed in state
of CH 2 INV (36) button is for the difference (CH 1-CH 2).