Agilent Technologies 71501D Uživatelský manuál stáhnout pdf (Strana 45)

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Application Tutorials

Tutorial 3: Measure Extinction Ratios on Low-Level Signals

Autoscaled Display of Low-Level Signal

4 Turn filtering on by pressing:

Setup, eyefltr ON OFF ON

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 level.

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

disconnect the input signal at channel 1.)

6 Perform the calibration by pressing:

Trg,Cal, OFFSET CAL, CONT

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

finished, DC NULL: done is displayed.

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

reconnect the input signal at channel 1.)

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Agilent Technologies 71501D Uživatelský manuál Strana 45