Proof Test System Maintenance; Check Proof Test Calibration/Recalibration; Replace Fiber Holding Block Inserts - THORLABS vytran PTR406 User Manual

Fiber Recoaters with Linear Proof Testers Chapter 11: Maintenance
fiber is under slight tension. (A fiber nominally smaller than that of the diameter of the recoat mold should be used.)
Using a 10X magnifying loupe, view the fiber straight down at the right hand edge of the recoat station, as shown
in the Figure 45. Adjust the recoat assembly such that the fiber is centered in the bottom recoat groove. Repeat this
procedure while viewing the fiber at the left edge of the recoat station. Tighten the recoat flange screws and re-
check the fiber alignment.
Align Recoat Mold

11.4. Proof Test System Maintenance

11.4.1. Check Proof Test Calibration/Recalibration

The proof test calibration must be periodically checked to ensure that the correct load is being applied to the fiber.
If the Proof Tester is applying a greater load than expected, the process yield may be adversary affected due to
excessive proof test failures. If the Proof Tester is applying a load less than expected, the proof tested section of
the fiber may be weaker than required and could fail at a later time.
Checking and recalibrating the Proof Tester requires special equipment and training. Contact Thorlabs to learn
more about calibration options.

11.4.2. Replace Fiber Holding Block Inserts

Replace the top or bottom insert by loosening the four (4) set screws securing them in place with a 0.035" Allen
wrench. (One full turn counterclockwise should be sufficient.) Remove the insert and clean the slot of the fiber
holding block. Refit the new insert into the slot and center it within the fiber holding block. Lightly tighten the set
screws while applying downward pressure on the insert. Excessive force is not required to hold the inserts in place
- do not over tighten.
Replace FHB Inserts
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