Digital Storage Oscilloscope 50
Peak Detect:
Use this mode to detect glitches within 10ns and to limit the possibility of
aliasing. This mode is valid at the SEC/DIV setting of 4µs/div or slower. Once you set
the SEC/DIV setting to 4µs/div or faster, the acquisition mode will change to Normal
because the sample rate is fast enough that Peak Detect is unnecessary. The
oscilloscope does not display a message to tell you that the mode has been changed
to Normal.
Average:
Use this mode to reduce random or uncorrelated noise in the signal to be
displayed. Acquire data in Normal mode and then average a great number of
waveforms. Choose the number of acquisitions (4, 16, 64 or 128) to average for the
waveform.
Stopping the Acquisition:
When you are running the acquisition, the waveform
display is live. Stop the acquisition (press the RUN/STOP button) to freeze the display.
In either mode, the waveform display can be scaled or positioned by vertical and
horizontal controls.
Equivalent Acquisition:
Just repeat the Normal acquisition. Use this mode to take a
specific observation on repeatedly displayed periodic signals. You can get a resolution
of 40ps, i.e. 25GSa/s sample rate, which is much higher than that obtained in real-time
acquisition.
The acquisition principle is as follows.
As shown above, acquire input signals (cycle repeatable) for more than once at a slow
sample rate, arrange the sample points by the time they appear, then recover
waveforms.
First Acquisition
Second Acquisition
Third Acquisition
Fourth Acquisition
Input repeated signals
