Eye, Mask and Eyeline Mode Measurement Tutorials
Making Eye Diagram Measurements
NOTE
For HP 83480A only:
The instrument has the capability to set its horizontal scale in time units, as is typical with
conventional oscilloscopes, or in a scale corresponding to bit periods. By selecting bit period and
entering the bit rate, the time base can then be set to show a specic number of bits. For instance,if
a transmitter is operating at 2.48832 Gbit/sec, select the STM16/OC48 setting for the bit period. To
display two complete eyes of the pattern, the scale is then set to two bits. If the position of the bit
pattern needs to be oset by one half bit, the current position value is adjusted by one half bit. This
is
more
intuitive
than
working
directly
in
a
time
format.
5-8
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