Perkin-Elmer Lambda 20, Installation And Maintenance Manual

Page: 34 / 108

Basic Installation
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This completes the coarse alignment of the cell holder. If necessary, proceed with
the fine alignment as described below.
Fine Alignment
If fine alignment is necessary, proceed as follows:
1. Using the [GOTO] key, slew the monochromator to your measurement
wavelength or to 460 nm.
2. Call up a method that uses transmission (%T) as the ordinate.
If necessary change the ordinate mode to transmission.
3. Open the sample compartment cover.
4. Insert the cell with a low absorbing solvent into the sample cell holder.
Leave the reference cell holder empty.
5. Make horizontal fine alignment to the sample cell holder (locking screws and
milled posts loosened) to obtain the highest possible transmittance reading on
the display (close sample compartment cover while measuring transmittance).
6. Make vertical fine adjustment using the vertical adjustment screw again to
obtain the highest possible reading (close sample compartment cover while
measuring transmittance).
7. When you are satisfied with the alignment, tighten the milled posts and the
locking screws on the cell holder.
8. Insert the matching cell with the same low absorbing solvent into the reference
cell holder.
The first cell remains in the sample cell holder.
9. Repeat steps 5 to 7 with the reference cell holder, but this time obtain the
lowest possible transmittance reading on the display.
This completes the fine alignment procedure.
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