Ocean Optics FHSA-TTL - Manual (Page 9)

1: Setup
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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.