HP 83480A User Manual

Eye, Mask and Eyeline Mode Measurement Tutorials
Making Eyeline Measurements
(HP 83480A Option 001 only)
Noise reduction
As the power level in a signal is reduced, noise can make analysis dicult.
In many measurement applications, random noise can be eectively reduced
through trace averaging. Trace averaging is not a viable noise reduction
technique for multi-valued waveforms, such as an eye diagram, because the
result is the average between the two logic levels, which results in a collapsed
eye.
Because eyeline mode produces continuous traces, trace averaging can be
used for
noise reduction.
When
averaging
is
implemented,
each
eyeline
trace is
measured N
times (N=#
averages)
and
the
average
of
the
N
traces
is
displayed.
Figure
5-18.
Conventional
eye
diagram of
a
low
power
signal.
5-40

HP 83480A Specifications

General

Brand	HP
Model	83480A
Category	Measuring Instruments
Language	English