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                                            ARINC 429 Eye-diagram and
                                            Pulse-shape Mask Testing

                                            Application Note



                                                                Probing the Differential ARINC 429 Bus
                                                                ARINC 429 mask testing is based on capturing and
                                                                overlaying all "1" and/or "0" bits of the differential bus. The
                                                                differential bus must be probed using a differential active
                                                                probe. Agilent recommends using the N2791A 25-MHz
                                                                differential active probe shown in Figure 1. The attenuation
                                                                setting on the probe should be set to 10:1 (not 100:1). The
                                                                output of the probe should be terminated into the scope's
                                                                default 1-M input termination..
Introduction
Eye-diagram mask testing is used in a broad range of
today's serial bus applications. An eye-diagram is basically
an overlay of all bits captured by the scope to show when
bits are valid and not valid. This provides a composite
picture of the overall quality of a system's physical layer
characteristics, which includes amplitude variations possibly
due to transmission line affects, reflections, system noise,
over-shoot, ringing, signal edge timing, and jitter.

Eye-diagram and pulse-shape pass/fail mask testing can
be performed on differential ARINC 429 signals using an
Agilent 3000 or 4000 X-Series oscilloscope licensed with
the DSOX3AERO/DSOX4AERO triggering and decode option
(MIL-STD 1553 & ARINC 429), along with the DSOX3MASK/
DSOX4MASK mask test option. Various ARINC 429 mask
files can be downloaded from Agilent's website at no
charge. Save the appropriate ARINC 429 mask files (based
on baud rate) to your personal USB memory stick and then
insert the memory stick into the scope's front-panel USB
port. The following ARINC 429 mask files are available:

   

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