Agilent Technologies 71501D Manuel d'utilisateur télécharger pdf (Page 38)

Application Tutorials

Tutorial 1: Measure Eye-Parameters

The eye-diagram analyzer performs automatic eye measurements in eye

mode. This mode is similar to that of conventional sampling oscilloscopes; the

display shows individual dots.

View the Signal

1 To view the signal, press:

INSTR PRESET, Traces, persist, VARIABL

This turns the persistence mode on. Refer to Chapter 3, “Eye-Diagram Ana-

lyzer Reference” for an explanation of the available persistence modes.

2 Enter the number of sweeps by pressing:

PERSIST SWEEPS and enter 8

3 Turn autoscaling on by pressing:

prev menu, AUTO-SCALE

The display should look similar to the display of a sampling oscilloscope. See

the following figure.

The large overshoot shown is a result of the particular laser bias setting used.

If the edges of the waveform are unstable in time (indicating no trigger), refer

to the “To Manually Set the Trigger Level” on page 1-25.

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Agilent Technologies 71501D Manuel d'utilisateur Page 38