Section 5
5-4 Maintenance
Optical
Path Swab
Reflector
Swab
6.
There are a number of swabs in the spare parts kit (see at left). Dip one end of the swab
into a 50:50 ethanol/water solution and carefully swab both ends of the optical bench,
until there is no more visible residue. A mild solution of dish washing type soap and
water will also work. Do not use abrasive cleansers, as they can irreparably damage
the gold plating on the optical bench.
7. Use a reflector swab and carefully swab the gold-plated concave surface of the source
housing, if necessary.
8.
If you need to clean out the hose barbs and/or replace the tubing connected to the source
and detector housings, use a small pair of diagonal cutters to remove the tubing from the
hose barbs. Use the cutters to pinch the tubing parallel to the hose barb axis, and then
pivot the cutters over the hose barb tip; the tubing will pull off of the hose barb. Be very
careful not to cut the tubing or scratch the hose barb with the cutters, as subsequent
tubing connections may leak.
9. Let the optical bench dry. Re-assemble the bench, making sure the O-rings are in place
on both ends of the bench. Note that the orientation of the cylinder is not important;
either end can be inserted into the source or detector housing.
10.
Re-assemble the LI-820 case. Make sure that the foam insulation on the inside top cover
is positioned over the optical bench; it is required for thermal stability.
11. Perform zero and span calibrations as described in Section 3, Calibration Window.
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