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SDS2000X HD Series Digital Oscilloscope User Manual
i n t . s i g l e n t . c o m 7 3
13.2.2 Acquisition
The acquisition mode is used to determine how to acquire and process the signal.
Normal: The oscilloscope samples the signal with equal time intervals. For most waveforms, the best
display effect can be obtained using this mode.
Peak: Peak detect mode. The oscilloscope acquires the maximum and minimum values of the signal
within the sample interval so the peak (maximum-minimum) in the interval is obtained. This mode is
effective to observe occasional narrow pulses or spurs with a low sample rate, but the noise displayed
is larger. In peak mode, the oscilloscope will display all pulses with a pulse width longer than 200 ps.
In the following example, a narrow pulse sequence with a pulse width of 3.4 ns and a period of 200
Hz is sampled at a 4 MSa/s sample rate in normal mode and peak mode. As we can see, because
the sample interval (250 ns) is much larger than the pulse width (3.4 ns), it is difficult to capture the
narrow pulses in normal mode, but peak mode can ensure that each pulse is captured.
Normal mode Peak mode
Average: The oscilloscope accumulates multiple waveform frames and calculates the average as the
result. If a stable trigger is available, the resulting average has a random noise component lower than
that of a single-shot record. The more frames that are accumulated, the lower the noise is. For the
SDS2000X HD, average processing is implemented by the hardware engine, so it can still maintain
a high waveform update rate when the acquisition mode is set to average.
You can reset the accumulated average by pushing the Clear Sweeps button on the front panel.
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