Agilent Technologies 71501D Manual do Utilizador descarregar pdf (Página 39)

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Application Tutorials

Tutorial 1: Measure Eye-Parameters

Example of a Large Overshoot Resulting from Laser Bias

Perform an Offset Calibration

This calibration procedure removes any offset that may be present in the opti-

cal-to-electrical converter. This is sometimes referred to as the "dark" level.

The offset calibration ensures accurate measurements of the laser’s one and

zero levels.

4 Turn the laser off. (If you are measuring the pattern generator directly,

disconnect the input signal at channel 1.)

5 Perform the calibration by pressing:

Trg,Cal, OFFSET CAL, CONT

The calibration takes about a minute to execute. When the calibration is fin-

ished, DC NULL: done is displayed.

6 Turn the laser on. (If you are measuring the pattern generator directly,

reconnect the input signal at channel 1.)

Measure Signal Parameters

7 To include the rise time and fall time measurement in the displayed results,

press:

Measure, r/f tim ON OFF ON

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Agilent Technologies 71501D Manual do Utilizador Página 39