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SIGLENT
SDS1000CML+/SDS1000DL+ User Manual 53
When you push the RUN/STOP or SINGLE buttons to start an acquisition, the
oscilloscope goes through the following steps:
1）. Acquire enough data to fill the portion of the waveform record to the left of
the trigger point. This is also called the pre-trigger.
2）. Continue to acquire data while waiting for the trigger condition to occur.
3）. Detect the trigger condition.
4）. Continue to acquire data until the waveform record is full.
5）. Display the newly-acquired waveform.
■ Time Base: The oscilloscope digitizes waveforms by acquiring the value of an
input signal at discrete points. The time base allows you to control how often the
values are digitized.
Use S/div knob to adjust the time base to a horizontal scale suits your purpose,
■ Time Domain Aliasing：
Aliasing occurs when the oscilloscope does not sample the signal fast enough to
construct an accurate waveform record. When this happens, the oscilloscope
displays a waveform with a frequency lower than the actual input waveform, or
triggers and displays an unstable waveform.
Sampled points
Apparent low-frequency
waveform due to aliasing
Actual high-frequency waveform
Picture 2.9-5
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