HP 83480A User Manual

Eye, Mask and Eyeline Mode Measurement Tutorials
Making Eye Diagram Measurements
Measuring crossing %
Crossing percentage is a relative measurement of the amplitude of the
crossing points of the eye. The mean crossing point is located rst on the
horizontal axis and then on the vertical axis. This is then used with the mean
high and low levels as follows:
C rossing per cent =100

V
cross
0 V
base
V
top
0 V
base

These measurements are made over the middle 20% of the eye by default.
The
measurement
window
can
be
changed
by
use
of
the
4
Dene
meas
5
menu.
Figure 5-5. Crossing percentage measurement.
1.
Select
NNNNNNNNNNNNNN
NNNNNNNNNNNNNNNNNN
Crossing %
from the softkey menu on the instrument display
.
The measurement will be displayed in the lower left corner of the
instrument display.
5-14

HP 83480A Specifications

General

Brand	HP
Model	83480A
Category	Measuring Instruments
Language	English