Datasheet

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PD 3607.1220.92 | Version 03.00 | November 2017 (sk)
Fast analysis of sporadic errors with segmented memory and history function
Data without tolerance limits is not binding | Subject to change
© 2014 - 2017 Rohde & Schwarz GmbH & Co.KG | 81671 Munich, Germany
3607.1220.92 03.00 PDP 1 en
36071220
92
History and segmented memory
Equipped with the R&S®RTB-K15 and the R&S®RTM-K15
options, the R&S®RTB2000 and the R&S®RTM3000 of-
fer a history function with a segmented memory of
160/400Msample per channel. The R&S®RTA4000 oscil-
loscopes provide a segmented memory of 1000Msample
per channel as standard. This is class-leading and covers
analog and digital channels. The memory can be divided
into several steps (see table). When the fast segmented
mode is activated, the blind time is reduced down to
1.5µs.
In history mode, all acquisitions can be analyzed at a later
time. A highly precise timestamp permits precise time cor-
relation of signal events. Individual marked segments can
be selected in the acquisition table for display. Alternative-
ly, the history function can be used to automatically play
back all segments. All measurement tools, including the
QuickMeas function, mask tests and protocol decoding,
are available for analyzing the faulty segment.
Easy configuration and fast results
The I²C signal in the figure shows protocol packets ap-
proximately 100µs in length. These protocol packets are
interrupted by communications pauses of one minute.
Activating the R&S®RTx-K1 protocol decoding option
quickly shows that a segment length of 10ksample
(83.3Msample/s sampling rate) is sufficient for reliably
decoding and detecting typical signal faults. The user sets
this value, and the option automatically calculates how
many segments are available. In the example, there are
approximately 35 000 segments, which corresponds to a
maximum record length of 24days.
Previous acquisitions can be accessed by pressing the his-
tory function button – both during or after the acquisition.
Standard mask tests and the navigation options provided
by the history function help users to quickly identify signal
faults and their causes. In the example, a glitch in the sys-
tem clock signal several packets before the faulty packet
was the key to identifying the cause of the error. The time-
stamp shows that the error occurred periodically (always
in the morning). Systematic tests confirmed that inad-
equate shielding on the line caused it to pick up a pulse
generated when the lab's fluorescent lights were switched
on. The problem was solved by improving the shielding.
More information
❙ www.rohde-schwarz.com/en/product/rtb2000
❙ www.rohde-schwarz.com/en/product/rtbk1
❙ www.rohde-schwarz.com/en/product/rtbk15
❙ rohde-schwarz.com/en/product/rtm3000
❙ rohde-schwarz.com/en/product/rtmk15
❙ rohde-schwarz.com/en/product/rtmk1
❙ rohde-schwarz.com/en/product/rta4000
❙ rohde-schwarz.com/en/product/rtak1
Specifications
R&S® RTB2000 RTM3000 RTA4000
Min. segment size 10 ksample 5 ksample 5 ksample
Max. segment size 20 Msample 200 Msample 200 Msample
Min. number of
segments
8 2 5
Max. number of
segments
13 107 26 214 87 380
Min. blind time < 1.5 μs < 1.5 µs
Total memory 160 Msample 400 Msample 1000 Msample
Decoded I²C signal with analog waveforms on the R&S®RTM3000.
Fast_analysis_ac_en_3607-1220-92_v0300.indd 2 30.11.2017 09:37:01