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Acquiring Waveforms
3-42
CSA7000 Series, TDS7000 Series, & TDS6000 Series Instruments User Manual
Sample interval
First sampled and digitized
point in record
Horizontal reference
Trigger point
Horizontal delay
Record length
Horizontal position
Figure 3- 10: The waveform record and its defining parameters
As Figure 3--10 shows, the instrument acquires points in order from left to right.
When all the points in the waveform record have been sampled and digitized, the
waveform record is in acquisition memory and becomes available for display (or
use in math waveforms, storage, and so on).
For a control-oriented discussion of the waveform record, see Horizontal
Acquisition Window Considerations on page 3--23 and Horizontal Scale vs.
Record Length vs. Sample Interval vs. Resolution on page 3--24.
The two general methods of sampling are real-time and equivalent-time. This
instrument uses both real- and equivalent-time sampling.
In real-time sampling, the instrument digitizes all the points it acquires after one
trigger event (see Figure 3--11). Always use real-time sampling to capture
single-shot or transient events.
Sampling rate
Record points
Figure 3- 11: Real-time sampling
Real-Time Sampling