Keysight X Series Installation Notes page 26

Upgrade Instructions
Rear Panel Installation
If the instrument has Option ST1 or ST2 the original rear panel will be reused to avoid having to
move the serial number label or the rear panel optical connector to the new one.
10.If the instrument does not have Option ST1 or ST2, attach the nut plate (1) to the rear frame
using the two hex nuts (2), as seen in
11.Attach the blank cover (3) to the rear frame using the two panhead screws (4). Torque the
screws to 9 in-lbs.
Figure 19 Optical Port Blank Cover Installation
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Figure 19. Torque the nuts to 9 in-lbs.
Installation Note N9042-90012