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(Real Time)
Peak Detect
Average
4
Averages
16
(Real Time)
64
128
Memory Depth
4K, 40K, 512K, 1M
(Real Time)
Normal: For the oscilloscope model with the bandwidth of 100MHz, the maximum sample rate is
1GS/s. For time base with insufficient sample rate, you may use the Sine Interpolation Algorithm to
interpolate points between sampled points to produce a complete waveform record (4K by
default).
Sample Points
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.
DS2002A Series Digital Storage Oscilloscope User Manual
Normal Acquisition Intervals
1
2
3 4
Normal Mode Acquires a Single Sample Point in Each Interval
Detect glitches and eliminate the possibility of
aliasing.
Reduce random or uncorrelated noise in signal
display. The number of averages is selectable.
Select the number of averages by pressing F3 or F4.
Select the memory depth for different board models.
5
6
7 8
9
10
Basic Operation
36
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