To use.
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If you use Average or Envelope mode, select the number of waveforms for that mode using the multipurpose knob.
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If you use Waveform Database mode, use the multipurpose knob to select the number of samples.
Oscilloscope reference
DPO70000SX, MSO/DPO70000DX, MSO/DPO70000C, DPO7000C, and MSO/DPO5000B Series 771