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MIL-STD 1553 Eye-diagram
Mask Testing
Application Note
Probing the Differential MIL-STD 1553 Bus
MIL-STD 1553 eye-diagram mask testing is based on
capturing and overlaying all "1" and "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 mask testing can be performed on differential
MIL-STD 1553 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 MIL-STD 1553 mask files can be
downloaded from Agilent's website at no charge. Save the
appropriate MIL-STD 1553 mask files to your personal USB
memory stick and then insert the memory stick into the
scope's front-panel USB port. The following MIL-STD 1553
mask files are available: