PeakTech 1220 Bedienungsanleitung Seite 69

5.14 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 appears 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 Peak Detect. In this case, you can test the glitch.
Now, you can see a screen that looks like the following figure 14.
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, such as 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.
figure 14: Peak Detection
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