c. Waveform Leakage: Due to low sampling rate, the reconstructed waveform might not reflect the actual signal.
4.2 Acquisition Mode
To obtain a waveform from sampling points, press ACQUIRE āīF1 to switch between acquisition modes.
(1) Normal Sampling
In this acquisition mode, the signal is sampled and reconstructed with equal time intervals. For most waveforms,
the use of this mode can produce the best display.
(2) Peak Sampling
In this acquisition mode, the maximum and minimum values of the input signal are found at each sampling interval,
and the waveform is displayed using these values. This way, the oscilloscope can acquire and display the narrow pulse,
otherwise the narrow pulse might be missed in the normal sampling mode. Noise might be enlarged in this mode.
(3) High Resolution
In this acquisition mode, the oscilloscope averages the neighboring points of the sampled waveform, which can reduce
random noise from the input signal and generate smoother waveforms.
(4) Envelope
The sampling points gathered at same time are calculated and the maximum and minimum values
are displayed. Peak detection mode is used for individual acquisitions using general envelope mode.
(5) Average
In this acquisition mode, the oscilloscope obtains several waveforms and finds the average, and
displays the final waveform. This method can reduce random noise.
By changing the acquisition mode settings, the resulting waveform display changes. The unaveraged
and the 32 times averaged waveform are displayed below for comparison.
Waveform without average Waveform with 32 times average
Note: Average and high resolution uses different average methods. The former is multiple sampling average,
the latter is single sampling average.
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