B&K Precision 2532B - Manual - Manual (Page 86)

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Advantage: In this way, the oscilloscope can acquire and display
narrow pulses, which may have otherwise been missed in Sample
mode.
Disadvantage: Noise will appear to be higher in this mode.
Figure 41 - Peak Detect
• Average: The oscilloscope acquires several waveforms, averages
them, and displays the resulting waveform.
Advantage: You can use this mode to reduce random noise.