Instruction manual

4-2
(4) Disconnect two BNC type connectors from the objective lens aperture unit. Remove four
screws fixing the flange of the unit. Pull off the unit straightly holding the flange.
Place the sperture unit on the aluminum foil
(10) Remove the aperture support fixing screw with a small screwdriver (the second smallest one
of the watch screwdriver set).
(11) Remove the aperture support with tweezers.
(12) Remove the objective aperture plate with tweezers.
To use the plate again, clean it by heating in the vacuum evaporator. (Refer to 4.1.3 “Baking
of aperture plates”)
Fig. 4-1 Objective Lens Aperture unit
C970500
Aperture support
(585-4488)
Aperture holder
(589-0548)
O-ring
(L456765)
aperture support fixing screw
(585-4421)
BNC Connectors
Flange fixing
screws