B&K Precision 2542B-GEN - Manual - Manual (Page 116)

Menu Operation
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Average mode lets you average multiple triggers to reduce
noise and increase resolution.
Peak Detect mode should be used to display narrow pulses
that occur infrequently. It’s useful when looking for very
narrow pulses at very slow time base.
Equivalent sampling mode is useful for displaying high
frequency repetitive signals.
Real Time sampling mode is useful to capture the single-shot
signals.