Realtime Sampling Option - Agilent Technologies 4000 X-Series User Manual

12
Acquisition Control
High Resolution mode can be used on both single- shot and repetitive
signals and it does not slow waveform update because the computation is
done in the MegaZoom custom ASIC. High Resolution mode limits the
oscilloscope's real- time bandwidth because it effectively acts like a
low- pass filter.
Displayed Sample Rate (sr, per
channel, 2.5 Gsa/s max)
625 MSa/s < sr 2.5 Gsa/s
156 MSa/s < sr 625 MSa/s
25 MSa/s < sr 156 MSa/s
5 MSa/s < sr 20 MSa/s
sr

Realtime Sampling Option

With the 4000 X- Series 1 GHz and 1.5 GHz bandwidth models, you can
turn off Realtime sampling and switch to equivalent time sampling.
(Realtime sampling is always on for the lower bandwidth models, and
there is no option for turning it off.)
This setting only has an effect when sweep speeds are 20 ns/div or faster.
At slower sweep speeds, there are enough sample points in a trigger
(acquisition, in other words) to render a waveform on the display.
Realtime sampling specifies that the oscilloscope produce the waveform
display from samples collected during one trigger event (that is, one
acquisition).
Use Realtime sampling to capture infrequent triggers, unstable triggers, or
complex changing waveforms, such as eye diagrams.
When Realtime sampling is on (as in the default setup):
• When less than 1000 samples can be collected in the time spanned by
226
5 MSa/s
the screen, a sophisticated reconstruction filter is used to fill- in and
enhance the waveform display.
Displayed Sample Rate (sr,
interleaved, 5 Gsa/s max)
1.25 GSa/s < sr
313 MSa/s < sr 1.25 GSa/s
50 MSa/s < sr 313 MSa/s
10 MSa/s < sr 40 MSa/s
sr 10 MSa/s
Agilent InfiniiVision 4000 X-Series Oscilloscopes User's Guide
Bits of
resolution
8
5 Gsa/s
9
10
11
12