3502
Optical Chopper System
15
3.2
Mounting the Unit
3.2.1
Chopper Head
The Model 3502 Optical Chopper Head (Figure 9 and Figure 10) may be secured
to standard optical benches using ¼”-20 or M6 bolts. The bolts pass through the
mounting plate perpendicular to the plane of the optical bench. This mounting
method provides the advantage of allowing the wheel to be rotated by loosening
the ¼”-20 set screws on the side of the motor mount. Do not over-tighten the set
screws.
The Model 3502 Optical Chopper head may also be mounted on standard ½”
optical bench rods. First, loosen the two ¼”-20 set screws. (These secure the head
to the mounting plate by compressing on the dowel.) Remove the dowel and
mounting plate assembly. Insert the ¼”-20 knob (supplied with the Chopper) into
the base of the head. This knob is inserted into the same hole occupied by the
dowel. Slide the motor mount onto the ½” optical bench rod and hand- tighten the
knob. Do not over-tighten.
Figure 8:
Functional block diagram for Model 3502 Optical Chopper.