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CHAPTER 5:
Advanced Operation
Model CRX-6.5K Probe Station
5.3.7 Reconfiguring an
Optical Fiber Assembly
If you will be changing cables frequently, it is recommended to have a probe arm
available with the appropriate cable already installed, then switch probe arms using
the instructions in section 5.3.3 and section 5.3.4. However, if an optical fiber change
is necessary, you can follow this procedure to do so.
5.3.7.1 Removing an Optical Fiber
The optical fiber assembly includes the optical fiber, terminations and the
feedthroughs. Follow this to remove an optical fiber from a probe arm and base.
1. Remove the micro-manipulated stage using the instructions in section 5.3.2.
2. Remove the bellows following steps 1 to 2 in section 5.3.3.
3. Cut the unwaxed dental floss that ties the optical fiber to the probe arm
thermal anchor.
4. Using a 2.5 mm hex driver, remove the four M3 screws that attach the fiber
feedthrough to the feedthrough extension.
5. Using a 2.5 mm hex driver, loosen the M3 set screw on the probe mount to release
the optical fiber tip (FIGURE 5-25).
6. Pull the feedthrough and its attached optical fiber out of the probe arm. Handle
the fragile optical fiber carefully; it should not be bent sharply or it may break.
7. If you are changing probe types, remove the feedthrough extension and probe
mount as necessary.
5.3.7.2 Installing an Optical Fiber Assembly
The optical fiber assembly includes the optical fiber, terminations and feedthroughs.
To remove the optical fiber, reference section 5.3.7.1. Follow this procedure to install
an optical fiber assembly onto a probe arm assembly. The procedure includes steps
for installing the optical fiber probe mount.
1. Orient the probe mount so the probe mount braids and braid block are down.
2. Slide the dowel end of the probe mount all the way into the probe arm. The brass
body of the probe mount should touch the copper end of the probe arm.
3. Using a 1.5 mm hex driver, secure the probe mount to the probe arm by tighten-
ing the probe arm set screws (FIGURE 5-22).
4. Lightly grease the feedthrough o-ring (FIGURE 5-23) and place it in the groove.
5. Using a 2.5 mm hex driver, attach the feedthrough extension to the probe arm
base with four M3 screws (FIGURE 5-23).
6. Lightly grease the extension o-ring, and place it in the groove.
Do not loosen the nut between the cable and the flange (FIGURE 5-23).
FIGURE 5-22
Secure the probe mount
to the probe arm
