User guide

Ratio of two optical power levels, low level and high level
• dB
Unit for measuring the extinction ratio.
ratio[dB]=10*log(ratio)
• %
Extinction Ratio in percentage
Graph
Set the criteria for the Timing Units:
• Unit Interval
Unit used to measure delay relative to the eye width.
• Seconds
Unit used to measure eye width in absolute terms of time.
Set the criteria for the waveform:
• Show Waveform
This option shows the waveform graphic.
• Smooth Waveform Graphic
The smooth waveform gives a finer waveform output. It logarithmically interpolates
between the measured points to give a finer waveform.
• BER Threshold
The BER Threshold value allows the user to measure around the eye boundaries
first, and then, deeper inside the Eye for BERs beyond the specified threshold.
Set the criteria for the Contour:
• Show Contour line
This option plots the contour.
• Show Legend
This shows the list of BER values.
• Show Grid
The 353pxl X 289pxl screen is divided into a 10 X 8 grid. This parameter adds a grid
to the screen.
Advanced Analysis 6
Agilent J-BERT N4903B High-Performance Serial BERT 335
Timing Units
Waveform
Contour
Grid