© 2018 Thorlabs
3 Operating Instruction
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3 Operating Instruction
3.1 Top Panel Controls
Operating Elements on the Top Panel
MODE Switch
- Used to switch between CW, Trigger and Modulation modes.
CW Mode:
The CW (continuous wave) mode provides a constant non-modulated LED current. The LED
brightness can be adjusted using the control knob. This mode is ideal for imaging with CCD
cameras or photodiodes.
Trigger Mode "TRIG":
In Trigger Mode the brightness of the LED can be adjusted using the control knob, and an ex-
ternally applied TTL signal has to be used to switch the LED current on and off. A high level will
enable the LED current and a low level will switch the LED current off.
This mode can be used to capture images with a CCD camera on a microscope automatically.
First the brightness can be set manually. Then switch to the Trigger mode and a computer con-
trolled TTL signal switches the LED on for a predefined period of time, while the camera is
triggered to take pictures.
Furthermore this Trigger mode can be used to drive the LED in Pulse Width Modulation
(PWM).
Modulation Mode "MOD":
In Modulation mode the LED is controlled completely by an external voltage. 0V corresponds to
off and 5V represents maximum LED current. All values in between correspond to the accord-
ing LED current.
The LED current can be arbitrary modulated, i.e. sine wave modulation.
Control Knob
Used to switch on the unit, and to adjust the intensity of the associated LED when operating in
CW mode.
