User`s guide

Firmware Prerequisites
6 Agilent 81560A, 81561A, 81566A, & 81567A Optical Attenuator Modules, First Edition
3 The manufacturer, part number, instrument number, and firmware
revision are listed. If the firmware revision number is less than
V3.5, follow the Update Procedure described in the readme.txt on
the root directory of this compact disk to install the newest
firmware revision for your mainframe.
8156x Series Modules
To check an 8156x series module's firmware revision:
1 Press the Config hardkey.
2 Move to the <About Modules> menu option and press Enter. You see
a box displaying the slots that have a module installed.
3 Move to the appropriate slot using the cursor key and press Enter.
4 The part number, module number, and firmware revision of the
chosen module are displayed. If the firmware revision number is
less than V3.5, follow the Update Procedure described in readme.txt
on the root directory of this compact disk to install the newest
firmware revision.