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Instruction Manual
IM-105-4000, Original Issue
August 2005
6-3
OPM 4000
Course Adjustments
Opacity is below zero and you can not reach zero after you have turned the
adjustment knob as far as it will go into the Micro-turn housing — perform the
following procedure:
1. Hold the Micro-turn in your hand so you can see the iris and retro
reflector. Turn the fine adjustment knob so that the iris is closed as far
as it will go.
2. Loosen the course adjustment set screw.
3. Turn the fine adjustment knob in the opposite direction as far as it will go
then tighten Allen set screw located on the bottom of the COM block. Be
sure not to tighten more than 1/16 of a turn to prevent damage to the iris
ring.
4. After the setscrew is tight, again try to reach zero. Repeat if necessary.
Opacity is above zero and you can not bring it up after you have turned the
adjustment knob as far as it will go into the Micro-turn housing — perform the
following procedure:
1. Hold the Micro-turn in your hand so you can see the iris and retro
reflector. Turn the adjustment knob so that the iris is open as far as it
will go. CAUTION: Do not force the knob at the first sign of binding
STOP.
2. Loosen the course adjustment set screw.
3. Turn the fine adjustment knob in the opposite direction as far as it will go
then tighten Allen set screw located on the bottom of the COM block. Be
sure not to tighten more than 1/16 of a turn to prevent damage to the iris
ring.
4. After the setscrew is tight, again try to reach zero. Repeat if necessary.
5. You have tried all of the steps above and you can not reach zero or zero
is unstable; contact the factory for assistance.
Micro-turn Parts List
Do not force the knob at the first sign of binding; STOP.
Do not force the knob at the first sign of binding; STOP.
Part Number Description
1395 2 in. (50,8 mm) square neutral density filter (certified and traceable to
NIST)
1626 Iris 1.9 x 1.34 in. (49 x 34 mm)
1163 1/4-20 x 2-1/2 in. Adjustment knob
1164 Lock nut