8.6
Optical amplifier setup
1. Operation indicator
2. Incident level scale
3. Adjustment knob (8-turn)
4. Timer switch (must be in OFF position)
5. Mode switch (must be in L position)
To adjust the optical amplifier, put a folded sheet of white paper in
the chamber as shown on the picture below, so the sight line of the sensor
is interrupted with this paper screen.
If the operation indicator (1) is lit up, then rotate the knob (3) counter-
clockwise until the indicator turns off. After that slowly rotate the knob
(3) until indicator (1) is lit up.
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