HP 83480A User Manual

The Digital Communications
Analysis Menus
Measure Eye Menu
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
Duty cycle distortion...
Duty Cycle Distortion is a measure of the time between the falling edge and
the rising edge of the eye pattern at the middle threshold. If the falling edge
and the rising edge intersect precisely at the middle threshold, there is no
duty cycle distortion. The middle threshold is set in the Dene Measure
menu. The default level is 50%. Duty cycle distortion is measured by
histogram analysis at the crossing points and middle threshold.
Duty cycle distortion can be displayed in two formats: time or percent. In
the time
format, the
actual
time
between
the
median
falling
edge
and
the
median rising
edge at
the
middle
threshold
is
determined.
In
the
percentage
format, the
time
dierence
is
determined
as
a
percentage
of
the
full
bit
width.
D
C
D
time
=
j
T
r
ise
50
per
cent
0
T
f
al
l
50
per
cent
j
D
C
D
per
cent
=
j
T
r
ise
50
per
cent
0
T
f
al
l
50
per
cent
j
bit
per
iod
Figure 6-10. Duty cycle distortion measurement.
Key Path 4
Shift
54
Meas eye
5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
Duty cycle distortion...
NNNNNNNNNNNNNNNNNNNN
Format time or user j % j
6-40

HP 83480A Specifications

General

Brand	HP
Model	83480A
Category	Measuring Instruments
Language	English