EXFO FTB-2 - Manual (Page 278)

Maintenance
268 FTB-2 and FTB-2 Pro
Installing or Removing the Power Meter and VFL
7. By holding the power meter by its faceplate, position it so that the
writings are right-side up.
8. Carefully align the power meter with the corresponding bay.
9. Gently slide the power meter into the bay until its faceplate is flush
with the edge of the bay. As the power meter reaches the back of the
bay, you should feel a slight resistance, indicating that it is properly
connected inside the unit.
Note: If the power meter slides all the way into the bay without any resistance, it
probably means that it is not properly inserted.
Writings