THORLABS ITC1 Series, Operation Manual

Page: 23 / 46

© 2018 Thorlabs GmbH
4 Operating Instruction
21
4.6 Operation
Switch the ITC1xx module On/Off
The laser current and the temperature controller are switched on and of by logic signals. These
signals are applied to the
64 pin connector ST1 :
·
pin C15: Laser current controller - H = On; L = Off
·
pin A13: Temperature controller - H = On; L = Off
Voltage levels:
·
+2.0 V
£
H
£
+25.0 V
·
L
£
+1.1 V
Either TTL or CMOS signals can be applied, as well as the positive supply voltage can be used.
The input resistance is about 10 k
W.
Note
Please remember that the interlock circuit must be closed to enable the switch-on of the laser
current.
Setting a Temperature Window
A temperature window can be enabled in order to protect the laser diode.
·
The temperature controller must not be switched on!
·
Keep your temperature sensor on a constant temperature.
·
Adjust the temperature set point T
SET
or R
SET
using the potentiometer P4 (measured at pin
C11 of ST1 ) in such a way that the difference between actual and set temperature corres-
ponds to the desired temperature window.
·
Now remove jumper JP4 and set potentiometer P8 fully clockwise (window = infinite).
·
Rotate P8 slowly counter clockwise until LED3 lights up.
·
The ITC1xx now is running in temperature protection mode.