Agilent Technologies 8163A User Manual page 46

Getting Started
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Figure 14 The Agilent 8164A/B's Details Screen for a Tunable Laser Channel
Figure 15 The Agilent 8166A Details Screen for a Power Sensor Channel
If more than 3 modules are inserted in the Agilent 8166A/B Lightwave
Multichannel System, the user interface cannot display each channel
number in the details screen. The arrow indicates that undisplayed
channels can be accessed by pressing the Channel hardkey.
Agilent 8163A/B, 8164A/B, and 8166A/B User's Guide, Fourth Edition
A Description of the User Interface