In this short video I will show how to use segmented memory acquisition and Keysight's
InfiniiVision 3000 and 4000 X-Series Oscilloscope to optimize acquisition memory to capture
more selective waveform data. Let's begin with a simple example using Keysight's
4000 X-Series Oscilloscope. Here we show a short sine wave burst that has a very low
duty cycle. Notice that the scope is currently sampling at five G samples per second.
To capture more occurrences of this burst I can increase the time base setting.
But the scope reduces its sample rate to just twenty M samples per second.
Sample rate is a function of the scope's time base setting and memory depth, which for this
scope is four million points. If I turn on zoom we can see that each burst is now under sampled.
One solution would be to use a scope with much deeper memory,
but a better solution is to use this scope's segmented memory acquisition mode.
With the scope's time base rescaled again for optimum resolution, let's now use the scope's segmented memory acquisition
mode to capture 1,000 consecutive occurrences of this burst.
The scope just completed the capture of 1,000 consecutive occurrences of these sign wave bursts. We can now review
each burst individually.
This first captured burst has a zero second time tag. The second burst occurred four milliseconds later, and
the last captured burst which is segment number 1,000, occurred nearly four seconds after
the first segment. With segmented memory acquisition the scope captured each sign wave burst with
high resolution, but didn't waste valuable acquisition memory capturing the idle time between each burst.
Capturing four seconds of time using conventional oscilloscope memory
would've required five GB of memory, which is currently not available in any scope on the market today.
Let's now see another measurement example that is a bit more complex.
We'll capture multiple and consecutive occurrences of selective packets of serial data.
Here we show the scope capturing a serial bus packet.
We can also see that the scope is detecting random errors.
What if we wanted to capture multiple and consecutive occurrences of errors so that we could more closely analyze each of them?
I've now set up the scope to exclusively trigger on errors. Let's capture 100 consecutive errors using segmented memory.
Once we begin the segmented memory acquisition, capturing all
100 packets with errors takes a few seconds since these errors occur very infrequently.
Here we show the first captured error at time tag zero.
Also note that all captured segments are displayed in the protocol Lister table which shows that each captured packet contained an error.
If we dial up to the last segment, we can see that it has a time tag in the ten-second range.
As you've seen in this short video, Keysight segmented memory acquisition capability in
the InfiniiVision 3000 and 4000 X-Series Oscilloscopes can be used to optimize your scope's available
acquisition memory, allowing you to capture more with less.
To learn more about Keysight's new InfiniiVision 4000 X-Series Oscilloscopes, contact your
local Keysight distributor and ask for a demonstration. Thank you.
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