6240B DC Voltage Current Source/Monitor Operation Manual
2.2.1 Setting Source Value
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3. Press   or rotate   one click counterclockwise.
The figure indicated by the cursor decreases by one increment.
4. Keep pressing  .
The figure indicated by the cursor increases incrementally while the key is being
pressed. 
The figure stops increasing when the key is released.
5. When   is rotated, the figure increased by one for each clockwise click or
decreases by one for each counterclockwise.
Setting the polarity
1. Pressing   or   moves the cursor position to the polarity display.
2. Press   or rotate   one click.
The polarity display changes to negative "-" mark. However, if the figure is 0, it
is impossible to set "-".