Agilent Technologies 71501D Manual do Utilizador descarregar pdf (Página 47)

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Application Tutorials

Tutorial 4: Measure Laser Turn-on Delay

On-screen markers can be used to measure both amplitude and time separa-

tion in eye-diagrams. The compatible modes for markers are eye, eyeline, and

pattern.

Change to Eyeline Mode

1 Change to eyeline mode, then turn filtering on by pressing:

INSTR PRESET, Setup, diagram, EYELINE, eyefltr ON OFF ON

BIT INTVL and enter 1

2 Set the persistence to infinite by pressing:

Traces, persist, INFINIT, Trg,Cal

3 After several traces have been displayed, press:

CONT STOP STOP

Turn on the markers

4 Press X1 and X2 to activate markers 1 and 2.

5 Turn the front-panel knob to move the markers to different transition crossing

points on the waveform as show in the following figure.

This provides an easy method to check the peak-to-peak difference in the laser

turn-on time measured at the crossing point. Notice in the following figure, a

delta reading of 30 ps is displayed at the top of the screen.

1 2 ... 42 43 44 45 46 47 48 49 50 51 52 ... 175 176

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Agilent Technologies 71501D Manual do Utilizador Página 47