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5. Offset: Press F4 to enter the second page. First press F1 button to select Offset, then
use the up, down, left and right direction keys to adjust the offset. Second press F1
button to open the digital keyboard again, use the up, down, left, right direction keys
and "Enter" key to set offset parameter, select "OK" and press "Enter" button to
confirm.
6. Press button, the backlight of the button turns green, i.e. output sine waveform.
7. The waveform observed by an oscilloscope is as follows: