6
Mounting the Chopper Head
The Model 3501 Optical Chopper head may be secured to standard optical
benches using 1/4-20 or M6 bolts. The bolts pass through the mounting plate
perpendicular to the plane of the optical bench. The chopper head can be
rotated off-axis by loosening the 1/4-20 set screws on the side of the motor
mount. Do not over-tighten the set screws.
The Model 3501 Optical Chopper head may also be mounted on standard
optical bench rods. First loosen the two 1/4-20 set screws which secure the
mounting plate to the head. Remove the mounting base. Insert the 1/4-20
knob (supplied with the chopper) into the base of the head. This knob is
inserted into the same hole occupied by the dowel on the mounting plate.
Slide the motor mount onto the optical bench rod and tighten the knob. Do
not over-tighten the knob.
Mounting the Wheel
Remove power from the control unit before attempting to change the chopper
wheel. Secure the chopper head to a work surface. Remove the four 4-40
screws that secure the retaining cap over the wheel, while taking care not to
bend the wheel. Install the replacement wheel, retaining cap and 4-40 screws.
Do not over-tighten the screws.
Control Cable
Connect the 6-wire cable from the connector at the side of the chopper head to
the MOTOR connector at the back of the control unit.
WARNING: Do not connect or disconnect the chopper head while the control
unit is powered or damage to components may occur. Always shut off the
instrument and allow the motor to stop before disconnecting the cable.
III
Safety and
Preparation
for Use
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