B+K precision 2552 User Manual page 71

Sa Rate
When you acquire a signal, the oscilloscope converts it into digital form
and displays a waveform. The acquisition mode defines how the signal is
digitized and the time base setting affects the time span and level of detail
in the acquisition.
Sampling: In this acquisition mode, the oscilloscope samples the
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signal in evenly spaced intervals to construct the waveform. This
mode accurately represents signals most of the time.
Advantage: You can use this mode to reduce random noise.
Disadvantage: This mode does not acquire rapid variations in the
signal that may occur between samples. This can result in aliasing,
which may cause narrow pulses to be missed. In these cases, you
should use the Peak Detect mode to acquire data.
Peak Detect: Peak Detect mode capture the maximum and
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minimum values of a signal Finds highest and lowest record points
over many acquisitions.
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.
Displays system sampling rate.
Figure 39 - Acquire Menu
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