Agilent Technologies 89410A Operator's Manual page 111

(Opt. AYH)
7.
View the constellation and eye diagram:
Press [
Press [
Press [
Press [
Press [
With VSB signals, symbol locations (detection decision points) are derived
from the real portion (I) of the demodulated data.
constellation diagram where you see symbols aligned vertically in 8
locations (16 locations for 16 VSB) along the I-axis. The vertical lines in
the constellation diagram indicate ideal symbol locations.
Hint
Displayed data must contain real data to see symbol locations for VSB signals.
For example, if you press
or the Q eye-diagram, you won't see symbol information.
Constellation and eye diagram for 8 VSB signal
], [ ],
Display 2 grids
], [ ], [
A Measurement Data
], [
Data Format polar (IQ) constellation
], [ ], [
B Measurement Data IQ measured time
], [ ].
Data Format eye diagram I
[ Data Format
]
IQ measured time
].
]
This is evident in the
] and select the imaginary part of the data
Using Video Demodulation
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