3 Basic Operation
3.4 Shield Ring Height Check
17FPD-2010
8.
Mount the quartz cylinder, the body, the head, and the photomultiplier by following the dismounting
procedure in reversed order. If difference of height exists at the connecting portion of the lens and the
photomultiplier, stray light may result. When mounting the photomultiplier, adjust the height using two
screws on the shielding plate at the lower portion of that photomultiplier so that no inclination will be
made. (In most cases, it is not necessary to change the height as the unit is so adjusted at installation
that any inclination is eliminated.)
Make adjustment with screws
at these two places.
Shield plate
Fig. 3.4.6
9.
Finally, fix the FPD upper cover on the FPD by the screw as before.
NOTE Because the FPD upper cover prevents the stray light entering the photomultiplier, the cover must be installed.
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