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3. Waveform Leakage: when the sample rate is too low, the waveform rebuilt from
the sample data do not reflect all the actual signal information.
7.5 LA Sample Rate
LA sampling is the process of sampling on the compared digital signals at a certain
time interval. LA sample rate is the reciprocal of the time interval. For example, if the
LA sample rate is 500 MSa/s, it indicates that the oscilloscope will make data
acquisition on the digital signals at an interval of 2 ns. The maximum LA sample rate
of the oscilloscope is 1.25 GSa/s, and its display value is related to the sample rate of
the current analog channel.
NOTE
• The digital signals mentioned here refers to the signal obtained from the comparison
between the input signal and the user-defined threshold level. The rule of the
comparison is that when the amplitude of the input signal is greater than the threshold
level, it is judged to be the logic high level; when the amplitude of the input signal is
smaller than the threshold level, it is judged to be the logic low level.
• LA sample rate is displayed under the
LA SampleRate menu. To indirectly modify the LA
sample rate, rotate the Horizontal
SCALE knob to adjust the horizontal time base or
modify the memory depth.
7.6 Memory Depth
Memory depth refers to the number of points of the oscilloscope that can store in
one trigger acquisition. It reflects the storage capability of the acquisition storage.
This oscilloscope is equipped with a standard memory depth of up to 500 Mpts.
To Set the Sample System
72
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