5.13. Using Peak Detection to Display Glitches
You can use this function to display events (glitches or other asynchronous waveforms) of 50 ns or wider.
1.
Press
MENU
key and the function menu appear at the right side of the screen.
2.
Press
MENU
▲
or
MENU
▼
key to select the
ACQU MODE
. Four items selectable are displayed at the
bottom of the screen.
3.
Press
F2
key and jump to Glitch Detect. In this case, you can test the glitch.
Now, you can see a screen that looks like the following Figure.
Figure 15: Peak Detection
Term interpretation
*
Collecting mode:
The oscilloscope transforms the collected analog data into a digital form after they are
gathered in the following three different modes, that is, sampling, peak value detection and averaging
values.
*
Sampling:
The oscilloscope takes samples from the signal at a equal time interval to reconstruct the
waveform in this mode, by which the analog signal can be expressed correctly in most cases, yet, the
rapid changes can not be collected between two sampling time intervals, causing the confusion and loss
the narrow pulse in the signal probably.
*
Peak value detection:
The oscilloscope takes samples from the maximum and minimum of signals in
each sampling interval and shows the waveform with the sampled data in this mode, thus, by which the
oscilloscope may collect the possibly lost narrow pulse in the sampling mode but the noise is obvious.
*
Averaging values:
the oscilloscope collects several waveforms and average over them, and displays the
averaged waveform in this mode, by which the random noise can be reduced.
*
Duration time:
When a new waveform is displayed, the previous waveform shown on the screen does
not disappear immediately only to be displayed for a period of time, that is, the duration time, by setting
which, the waveform can be displayed more continuously and thus a display similar to that shown by the
analog oscilloscope can be achieved.
*
Roll scan mode:
The oscilloscope updates the waveform sampling points by scrolling display through a
screen from left to right in this mode, which is only applicable to the primary time base setting of above
50ms.
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