User`s guide

Getting Started with Attenuator Modules What is an Attenuator?
18 Agilent 81560A, 81561A, 81566A, & 81567A Optical Attenuator Modules, First Edition
Variable Optical Attenuator Front Panels
Agilent 81560A
Figure 2 Agilent 81560A Attenuator with Straight Connector
Agilent 81561A
Figure 3 Agilent 81561A Attenuator with Angled Connector
Front Panel Controls and Indicators
The front panel contains a push button to switch the shutter
open/closed, and a LED that indicates the state of the shutter. If the
shutter is “open”, the LED shows “enable”, and light can pass through
the instrument.