Keysight N5454A Segmented memory acquisition Datasheet

Keysight Technologies
Segmented Memory Acquisition
for InfiniiVision Series Oscilloscopes
Data Sheet
Introduction
Capture more signal detail with less memory using
segmented memory acquisition
Features:
–– Optimized acquisition memory
–– Capture up to 2,000 successive waveform segments
–– Fast re-arm time
–– Down to 10 ps time-tag resolution
–– Segments include all analog and digital channels of acquisition
–– Segments include serial bus decoding
If the signals that you need to capture have relatively long idle times between lowduty-cycle pulses or bursts of signal activity, then the segmented memory option
for Keysight Technologies, Inc. InfiniiVision Series oscilloscopes can optimize your
scope’s acquisition memory, allowing you to capture more selective signal details
with less memory. With segmented memory, the scope’s acquisition memory (up
to 8 M points) is divided into multiple smaller memory segments. This enables your
scope to capture up to 2,000 successive single-shot waveforms with a very fast
re-arm time–without missing any important signal information.
After a segmented memory acquisition is performed, you can easily view all
captured waveforms overlaid in an infinite-persistence display and quickly
scroll through each individual waveform segment. And with a minimum 10 ps
time-tagging resolution, you will know the precise time between each captured
waveform segment. Common applications for this type of oscilloscope acquisition
include high-energy physics measurements, laser pulse measurements, radar burst
measurements, and packetized serial bus measurements.
Even in applications that don’t actually require segmented memory acquisition to
optimize memory, using segmented memory acquisition on Keysight’s InfiniiVision
oscilloscopes can enhance post-analysis navigation through low-duty-cycle signals,
burst signals, and serially packetized signals. And the Keysight InfiniiVision Series
oscilloscopes are the only scopes in the industry that not only provide segmented
memory acquisitions simultaneously on all analog channels (up to four analog
channels) and logic channels (up to 16 digital channels) of acquisition, but they also
are the only scopes that provide hardware-based serial decoding on packetized serial
data for each captured waveform segment.
03 | Keysight | Segmented Memory Acquisition for InfiniiVision Series Oscilloscopes - Data Sheet
High-Energy Physics and Laser Pulse Applications
Segmented memory acquisition
in an oscilloscope is commonly
used for capturing electrical pulses
generated by high-energy physics
(HEP) experiments, such as capturing
and analyzing laser pulses. With
segmented memory acquisition,
the scope is able to capture every
consecutive laser pulse (up to a
maximum of 2,000 pulses), even if the
pulses are widely separated.
Figure 1 shows the capture of 300
successive laser pulses with a pulse
separation time of approximately
12 µs and an approximate pulse width
of 3.3 ns. All 300 captured pulses are
displayed in the infinite-persistence
gray color, while the current selected
segment is shown in the channel’s
assigned color (yellow for channel 1).
Note that the 300th captured pulse
occurred exactly 3.62352380 ms after
the first captured pulse, as indicated
by the segment time-tag shown in the
lower left-hand region of the scope’s
display. With the scope sampling at
4 GSa/s, capturing this amount of time
would require more than
14 Megapoints of conventional
acquisition memory. If these laser
pulses were separated by 12 ms,
the amount of conventional
acquisition memory to capture
nearly 4 seconds of continuous
acquisition time would be more than
14 Gigapoints. Unfortunately, there
are no oscilloscopes on the market
today that have this much acquisition
memory. But since segmented memory
only captures a small and selective
segment of time around each pulse
while shutting down the scope’s
digitizers during signal idle time, the
Keysight InfiniiVision scopes can easily
capture this much information using
just 8 Megapoints of memory
(7000 Series).
Figure 1: Segmented memory acquisition captures 300 consecutive laser pulses for analysis.
A similar high-energy physics
application involves the measurement
of energy and pulse shapes of signals
generated from subatomic particles
flying around an accelerator ring
(particle physics). Assuming that
sub-atomic particles have been slung
around a 3-km accelerator ring at a
speed approaching the speed of light
(299,792,458 meters/s), electrical
pulses generated at a single detector
at one location along the 3 km ring
would occur approximately every
10 µs. With segmented memory, you
can easily capture, compare and
analyze successive pulses generated
by the subatomic particles with precise
time-tagging.
04 | Keysight | Segmented Memory Acquisition for InfiniiVision Series Oscilloscopes - Data Sheet
Radar and Sonar Burst Applications
Engineers often require segmented
memory acquisition mode in an
oscilloscope when they measure radar
and/or sonar bursts. Figure 2 shows
an example where we captured 725
consecutive 50-MHz RF burst signals
using a Keysight InfiniiVision scope’s
segmented memory acquisition mode.
Engineers often need to compare sent
and received signals and compare
signal degradation from echo signals.
These types of RF burst applications
also require precise time-tagging in
order to accurately compute distances.
Distance and time between bursts
can often be very long, for example,
when you are analyzing satellite
communications. If a satellite is
located 100 miles in space away from
an Earth transmitter/receiver station, a
radar echo time (more than 200 miles
round trip) would be approximately
1.07 ms. Using the 50-MHz RF
burst shown in Figure 2, you could
easily capture 725 consecutive
bursts separated by 1.07 ms using
segmented memory. Capturing this
much time (775 ms) using conventional
oscilloscope acquisition at 1 GSa/s
would require nearly 1 Gigapoints
of acquisition memory. But with the
segmented memory option in the
Keysight InfiniiVision Series, this scope
can easily capture this amount of
signal data.
Figure 2: Capturing consecutive RF bursts with precise time-tagging using segmented memory.
05 | Keysight | Segmented Memory Acquisition for InfiniiVision Series Oscilloscopes - Data Sheet
Mixed-Signal and Serial Bus Applications
Serial bus measurements are another
application area where segmented
memory acquisition is useful. You can
optimize the number of packetized
serial communication frames that
can be captured consecutively by
selectively ignoring (not digitizing)
unimportant idle time between frames.
As mentioned earlier, the Keysight
InfiniiVision Series oscilloscopes are
the only scopes on the market today
that not only can acquire segments
of up to four analog channels of
acquisition, but also can capture
time-correlated segments on digital
channels of acquisition (using an
MSO model), along with hardwarebased serial bus protocol decoding.
The segmented memory option
on the Keysight InfiniiVision Series
oscilloscopes is compatible with all of
the following serial bus triggering and
decoding options:
–– I2C/SPI
–– RS-232/UART
–– USB
–– CAN/LIN
–– I 2 S
–– MIL-STD 1553/ARINC 429
–– FlexRay
To illustrate how segmented memory
acquisition can enhance serial bus
measurements, we will examine a
mixed-signal automotive CAN bus
measurement application. Figure 3
shows a CAN bus measurement with
the scope set up to trigger on every
start-of-frame (SOF) condition. Using
this triggering condition with the
segmented memory acquisition mode
turned on, the scope easily captures
1,000 consecutive CAN frames for a
total acquisition time of 2.4 seconds.
After acquiring the 1000 segments/
CAN frames, we can easily scroll
through all frames individually to
look for any anomalies or errors. In
addition, we can easily make latency
timing measurements between frames
using the segmented memory’s timetagging.
Figure 3: Capturing 1,000 consecutive decoded CAN frames using segmented memory.
06 | Keysight | Segmented Memory Acquisition for InfiniiVision Series Oscilloscopes - Data Sheet
Mixed-Signal and Serial Bus Applications
Figures 4a and 4b show examples of
capturing 1,000 consecutive remote
and data frames with the ID code
of 07FHEX. This was accomplished
by setting the trigger condition to
trigger on either remote or data
frames with this specific frame ID.
Now we can easily measure the
timing latency between each remote
transfer request frame with a frame
ID of 07FHEX and its associated data
frame response with the same frame
ID. In this measurement example, the
latency between segment 4 (remote
frame) and segment 5 (data frame)
was 4.821 ms. Also note that although
not shown, the time-tag on the last
captured segment (segment 1,000)
was approximately 9.5 seconds.
Capturing this much time using
conventional oscilloscope acquisition
memory at this sample rate would
require 16 Megapoints of memory.
Figure 4a: Remote frame 07FHEX captured as segment 4 has a time-tag of 32.3199 ms.
Figure 4b: Data frame 07FHEX captured as segment 5 is time-tagged at 37.1359 ms indicating a latency
of 4.816 ms.
07 | Keysight | Segmented Memory Acquisition for InfiniiVision Series Oscilloscopes - Data Sheet
Mixed-Signal and Serial Bus Applications (continued)
While scrolling through the various
segments/frames, we could see that
errors were occurring randomly. So the
next step in this CAN measurement
application was to capture and store
only frames that contain errors.
To do this, we set up the scope’s
triggering to trigger specifically on
any occurrence of any "form error" or
"flagged error frame" regardless of
its ID code. Figure 5 shows how the
segmented memory acquisition mode
captured 500 consecutive error frames
with a total capture time (time-tag
of the segment 500) of more than 50
seconds. Capturing this many frames
at this sample rate using conventional
oscilloscope memory would require
more than 100 MB of acquisition
memory. But with the segmented
memory option, our InfiniiVision
3000 X-Series oscilloscope was able
to capture more than 50 seconds
of selective signal detail using its 4
Megapoints of memory.
Once we have captured consecutive
CAN error frames, we can easily dial
through all of the individual frames to
discover why these errors might be
occurring.
Figure 5: Segmented memory captures 500 consecutive CAN frames over a 50-second time span.
08 | Keysight | Segmented Memory Acquisition for InfiniiVision Series Oscilloscopes - Data Sheet
Performance characteristics
Segment source
Analog channels 1 and 2 (on two-channel DSO models)
+ Analog channels 3 and 4 (on four-channels DSO models)
+ Digital channels D0 to D15 (on MSO models)
+ Serial decode (on models with serial decode options)
Number of segments
1 to 2000 (5000, 6000, and 7000 Series)
1 to 1000 (3000, 4000, and 6000 X-Series)
1 to 250 (2000 X-Series)
Minimum segment size
500 points (+ Sin(x)/x reconstructed points on faster timebase settings)
Re-arm time
(minimum time between trigger events)
5000, 6000, 7000: 6 μs
6000 X-Series: 7.5 μs
3000 and 4000 X-Series: 1 μs
2000 X-Series: 20 μs
Time-tag resolution
10 ps or 6 digits (whichever is greater)
Ordering information
The segmented memory option
is compatible with all Keysight
InfiniiVision Series oscilloscopes. This
option is available as a factory-installed
option if ordered as Option SGM along
with a specific oscilloscope model, or
existing InfiniiVision Series oscilloscope
users can order this option as an afterpurchase product upgrade.
Model number—
user installed
Option number—
factory installed
Description
N5454A
SGM
Segmented memory for 5000, 6000, and 7000 Series oscilloscopes
DSOX2SGM
SGM
Segmented memory for 2000 X-Series oscilloscopes
DSOX3SGM
SGM
Segmented memory for 3000 X-Series oscilloscopes
Standard
N/A
Segmented memory for 4000 and 6000 X-Series oscilloscopes
09 | Keysight | Segmented Memory Acquisition for InfiniiVision Series Oscilloscopes - Data Sheet
Related Keysight literature
Publication title
Publication type
Publication number
InfiniiVision 2000 X-Series Oscilloscopes
Data sheet
5990-6618EN
InfiniiVision 3000 X-Series Oscilloscopes
Data sheet
5990-6619EN
InfiniiVision 4000 X-Series Oscilloscopes
Data sheet
5991-1103EN
InfiniiVision 6000 X-Series Oscilloscopes
Data sheet
5991-4087EN
InfiniiVision 7000B Series Oscilloscopes
Data sheet
5990-4769EN
Oscilloscope Waveform Updates Rates Determines Probability of Capturing Elusive Events
Application note
5989-7885EN
Evaluating Oscilloscopes to Debug Mixed-Signal Designs
Application note
5989-3702EN
Evaluating Oscilloscope Bandwidths for your Applications
Application note
5989-5733EN
Oscilloscope Sample Rates vs. Sampling Fidelity
Application note
5989-5732EN
Evaluating Oscilloscope Vertical Noise Characteristics
Application note
5989-3020EN
Oscilloscope Segmented Memory for Serial Bus Applications
Application note
5990-5817EN
10 | Keysight | Segmented Memory Acquisition for InfiniiVision Series Oscilloscopes - Data Sheet
Keysight Oscilloscopes
Multiple form factors from 20 MHz to > 90 GHz | Industry leading specs | Powerful applications
11 | Keysight | Segmented Memory Acquisition for InfiniiVision Series Oscilloscopes - Data Sheet
myKeysight
www.keysight.com/find/mykeysight
A personalized view into the information most relevant to you.
www.axiestandard.org
AdvancedTCA® Extensions for Instrumentation and Test (AXIe) is an
open standard that extends the AdvancedTCA for general purpose and
semiconductor test. Keysight is a founding member of the AXIe consortium.
ATCA®, AdvancedTCA®, and the ATCA logo are registered US trademarks of
the PCI Industrial Computer Manufacturers Group.
www.lxistandard.org
LAN eXtensions for Instruments puts the power of Ethernet and the
Web inside your test systems. Keysight is a founding member of the LXI
consortium.
www.pxisa.org
PCI eXtensions for Instrumentation (PXI) modular instrumentation delivers a
rugged, PC-based high-performance measurement and automation system.
Three-Year Warranty
www.keysight.com/find/ThreeYearWarranty
Keysight’s commitment to superior product quality and lower total cost
of ownership. The only test and measurement company with three-year
warranty standard on all instruments, worldwide.
Keysight Assurance Plans
www.keysight.com/find/AssurancePlans
Up to five years of protection and no budgetary surprises to ensure your
instruments are operating to specification so you can rely on accurate
measurements.
www.keysight.com/quality
Keysight Technologies, Inc.
DEKRA Certified ISO 9001:2008
Quality Management System
Keysight Channel Partners
www.keysight.com/find/channelpartners
Get the best of both worlds: Keysight’s measurement expertise and product
breadth, combined with channel partner convenience.
www.keysight.com/find/scopes
For more information on Keysight
Technologies’ products, applications or
services, please contact your local Keysight
office. The complete list is available at:
www.keysight.com/find/contactus
Americas
Canada
Brazil
Mexico
United States
(877) 894 4414
55 11 3351 7010
001 800 254 2440
(800) 829 4444
Asia Pacific
Australia
China
Hong Kong
India
Japan
Korea
Malaysia
Singapore
Taiwan
Other AP Countries
1 800 629 485
800 810 0189
800 938 693
1 800 112 929
0120 (421) 345
080 769 0800
1 800 888 848
1 800 375 8100
0800 047 866
(65) 6375 8100
Europe & Middle East
Austria
Belgium
Finland
France
Germany
Ireland
Israel
Italy
Luxembourg
Netherlands
Russia
Spain
Sweden
Switzerland
United Kingdom
0800 001122
0800 58580
0800 523252
0805 980333
0800 6270999
1800 832700
1 809 343051
800 599100
+32 800 58580
0800 0233200
8800 5009286
0800 000154
0200 882255
0800 805353
Opt. 1 (DE)
Opt. 2 (FR)
Opt. 3 (IT)
0800 0260637
For other unlisted countries:
www.keysight.com/find/contactus
(BP-07-10-14)
This information is subject to change without notice.
© Keysight Technologies, 2011 - 2014
Published in USA, August 1, 2014
5989-7833EN
www.keysight.com