Displaying Signals
Actual High-Frequency Signal
Apparent Low-Frequency
Waveform Due to Aliasing
Sampled Points
Figure
3-1
8:
Aliasing
One simple way to check for aliasing is to slowly change the horizontal scale
(time per division setting). If the shape of the displayed waveform changes
drastically, you may have aliasing.
There are a couple of ways to prevent signal aliasing:
Set up the signal display in the
NON-STORE
mode before switching to
STORE.
While the oscilloscope is in the
NON-STORE
mode you can set
the time base for an appropriate speed.
rn
Set up the signal display in another mode besides Sample. Because the
Peak Detect mode, for example, searches for samples with the highest
and lowest values, it can detect faster signal components over time.
Displaying Magnified
There are several ways to horizontally magnify the sweep:
Sweeps
Change the time base to a faster sweep speed.
Use the
6
Delayed Sweep. (Refer to Displaying Two Sweeps, page
3-22.)
Use the XI0 control to magnify (by ten times) the center one division of
the
NON-STORE
display or one division centered around the active
cursor in the
STORE
mode. The XI 0 magnifier also extends the upper
range of sweep speeds (for example, .05
ps to 5 ns per division).
Using
the
XI
0
Magnifier
The time per division readouts automatically change by the correct factor
when the
XI0 knob is pulled. In the
STORE
mode an acquisition window
indicator appears and
CURSORS
control can be used to scroll along the
waveform.
Perform the following procedure to use the
XI0 magnifier in the
NON-
STORE
mode:
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