Black Box Fiber Meter Manual page 22

The performance module is designed to be installed and
removed without tools.
Turn off the power to the Fiber Meter handset before adding
or changing a performance module.
To remove a performance module:
1. Loosen the thumbscrews on either side of the
performance module until the screws are free of
the retainer.
2. Grip the performance module on either side and
slide the module out of the handset.
To install a performance module:
1. Slide the performance module into the handset
until the screws rest against the retainers.
2. Hand-tighten the screws until the performance
module is properly seated.
Avoid damaging the Fiber Meter's case. Tighten the screws
evenly using finger pressure only. Make sure to turn both
screws in small increments.
CHAPTER 2: Introduction
NOTE
CAUTION
CAUTION
19