Realtime Sampling Option - Agilent Technologies 6000 Series User Manual

Realtime Sampling Option

6000 Series Oscilloscope User's Guide
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.
Realtime sampling can be turned on in Normal, Peak Detect, or
High Resolution acquisition modes. It cannot be turned on when
the acquisition mode is Averaging.
When Realtime sampling is on (as in the default setup):
• When less than 1000 samples can be collected in the time
spanned by the screen, a sophisticated reconstruction filter
is used to fill in and enhance the waveform display.
• If you press the Stop key, and pan and zoom through the
waveform using the Horizontal and Vertical controls, only the
last trigger's acquisition will be displayed.
When Realtime sampling is off:
• The oscilloscope produces the waveform display from
samples collected from multiple acquisitions. In this case, the
reconstruction filter is not used.
Realtime Sampling and Oscilloscope Bandwidth
To accurately reproduce a sampled waveform, the sample rate
should be at least four times the highest frequency component
of the waveform. If not, it is possible for the reconstructed
waveform to be distorted or aliased. Aliasing is most commonly
seen as jitter on fast edges.
The maximum sample rate for 100 MHz and 300 MHz bandwidth
oscilloscopes is 2 GSa/s.
The maximum sample rate for 1 GHz and 500 MHz bandwidth
oscilloscopes is 4 GSa/s for a single channel in a channel pair.
Channels 1 and 2 constitute a channel pair, and channels 3 and
4 constitute another channel pair. For example, the sample rate
of a 4-channel oscilloscope is 4 GSa/s when channels 1 and 3, 1
and 4, 2 and 3, or 2 and 4 are on.
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