3-7
Using the Infiniium DCA
Eye/Mask Mode
Eye/Mask Mode
The Eye/Mask mode allows you to pe r-
form NRZ (Non-Return to Zero), or RZ
(Return to Zero) eye diagram measure-
ments and eye mask tests. The eye dia-
gram is typically produced by trigger ing
the instrument with a synchronous
clock signal.
Eye/Mask mode measurements only
work when an eye diagram, and not a
pulse, is present on the screen. Mea-
surements made on a pulse waveform
while in Eye/Mask mode will fail.
Once you are in Eye/Mask mode, press the Autoscale button. This ensures
that an optimum eye diagram is displayed on the graticule. An optimum eye
diagram consists of a full display of t he eye in addition to portions of the wave-
form preceding and following the eye.
When you select the Eye/Mask mode, the
measurement toolbars shown here appear.
These measurement toolbars include mea -
surements such as rise time, fall time, jitter,
and exti nction r atio, as well as t he mask t est
start and stop controls.
Eye measurement and mask test results
appear below the display graticule. A maxi-
mum of four eye measurement test r esults
are displayed and include any failures or
instrument messages that may occur.
To learn more about the Eye/Mask mode and
switching from NRZ to RZ measurem ent
mode, consult the Help.