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Adjusting optical power – Ocean Optics FHSA-TTL User Manual

Page 9

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1: Setup

000-10000-140-02-1209

3

Shutter Switch Positions

Switch Position

Action

OPEN

Shutter open

CLOSE

Shutter closed

TTL

Operation by external TTL signal:

HIGH = Open

Low = Closed

Adjusting Optical Power

The FHSA-TTL is adjusted at the factory for maximum power. If lower optical power is required, you
can adjust it by turning the attenuation screw clockwise to decrease the power down to 0%.

FHSA-TTL Top View

Procedure

Follow the steps below to adjust optical power:

1. Move the shutter switch to the OPEN position to open the shutter.

2. Connect a fiber optic spectrometer or an optical power meter to one side of the FHSA-TTL.

3. Loosen the locking screw with a hexagonal socket screw key (SW 2.0 mm).

4. Turn the attenuation screw clockwise to decrease optical power.

5. Tighten the locking screw when the optical power has been properly adjusted.