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21
Horizontal System and Controls
An oscilloscope’s horizontal system is most closely associated with its
acquisition of an input signal – sample rate and record length are among
the considerations here. Horizontal controls are used to position and
scale the waveform horizontally. Common horizontal controls include:
Main
Delay
XY
Scale
1-2-5
Variable
Trace Separation
Record Length
Resolution
Sample Rate
Trigger Position
Zoom
Acquisition Controls
Digital oscilloscopes have settings that let you control how the acquisition
system processes a signal. Look over the acquisition options on your
digital oscilloscope while you read this description. Figure 25 shows you
an example of an acquisition menu.
Acquisition Modes
Acquisition modes control how waveform points are produced from
sample points. Sample points are the digital values derived directly
from the analog-to-digital converter (ADC). The
sample interval
refers
to the time between these sample points.
Waveform points
are the digital
values that are stored in memory and displayed to construct the waveform.
The time value difference between waveform points is referred to as the
waveform interval
.
The sample interval and the waveform interval may, or may not, be the
same. This fact leads to the existence of several different acquisition
modes in which one waveform point is comprised of several sequentially
acquired sample points. Additionally, waveform points can be created
from a composite of sample points taken from multiple acquisitions,
which provides another set of acquisition modes. A description of the most
commonly used acquisition modes follows.
XYZs of Oscilloscopes
Primer
Figure 25.
Example of an acquisition menu.
Summary of Contents for XYZs
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