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Measuring Waveforms
3-98
CSA8000B & TDS8000B User Manual
Performing a dark-level compensation maximizes the accuracy of the extinction
ratio and other optical automatic measurements you take. Performing a User
Wavelength Gain compensation optimizes an optical channel for your custom
input signal.
NOTE. Dark level compensation performs a subset of the module compensation
process. It is designed to be fast so it can be performed frequently, just before
measurements are taken. This compensation is not saved and are only valid for
the selected bandwidth or filter path and the internal optical pow er meter.
You should perform the procedure To Compensate the Instrument and Modules
on page 3--92 to compensate all vertical bandwidth and filter selections.
Use the following procedure to perform either compensation; this procedure
applies only to optical modules.
Overview To perform optical compensations Control elements and resources
Prerequisites 1. The instrument must be installed with at least one
optical sampling modules t o be dark-level calibrated in
place. The acquisition system should be set t o run
continuously.
See the sampling-module User Manuals for
sampling moduleinstallation.
Select the
waveform
2. Use the Vertical buttons to select the channel to be
compensated.
Access
dark-level com-
pensation
3. From the application menu bar, click Setup, and then
click Vertical. See right.
To Perform Dark-Level
and User Wavelength Gain
Compensations