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TDS1000/2000-Series Digital Oscilloscope User Manual
U in Level and D elta Readouts. Vertical sensitivity should match on
waveforms used for math operations. If they do not match, and you
use cursors to measure the waveform result of a math operation, a U
displays that represents unknown units or scaling.
Remove Waveform. To remove a waveform from the display, push the
menu button for the channel to display its vertical menu. Push the
menu button again to remove the waveform.
NOTE. You do not have to display a channel waveform to use it as a
trigger source or for math operations.