© 2018 Thorlabs
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ITC4000 Series
3.1.12 LDC Control Outputs
Trigger Out:
The ITC4000 trigger output jack (R3) provides a tracking of the QCW pulse, preselected in
QCW pulse settings. The output level is TTL5V.
Analog Control Out:
An Analog Control output (R1, see section
Operating elements at the rear panel
) is provided
at the rear of the unit for monitoring purposes, e.g. to watch the settling behavior of the con-
stant power control loop by means of an oscilloscope. At this jack, a voltage proportional to the
actual driven laser current, scaled to the maximum laser current of the unit is available. The
voltage ranges from 0 V to +10 V. The voltage formula is:
3.1.13 TEC Control Outputs
Temperature OK output
This output (R15, see section
Operating elements at the rear panel
) provides a TTL signal
(+5 V), which gets low (0 V) when the window protection is active. Please refer to section
.
This jack can be used to monitor the temperature of a laser diode when using a
Thorlabs
LDC340 or LDC200C series laser driver. Simply connect the corresponding plug of the laser
driver to this output of the ITC4000. The laser will be switched off if the laser temperature
moves out of the temperature window. Further details can be found in the operation manual of
the respective laser driver.
Analog temperature deviation output
A temperature output "DEVIATION OUT" (R14, see section
Operating elements at the rear
) is provided at the rear of the unit. At this jack, a voltage proportional to the actual tem-
perature deviation, scaled to the adjusted temperature window is applied for monitoring pur-
poses, e.g. to watch the settling behavior of the temperature control loop by means of an oscil-
loscope. The voltage ranges from -5 V to +5 V. The voltage formula is:
Example:
If the temperature set point is 25 °C and the temperature window is set to 2 °C, an actual tem-
perature of
23 °C leads to -5 V at the output
25 °C
leads to 0 V at the output
27 °C
leads to +5 V at the output
).
The temperature deviation output "DEVIATION OUT" is grounded. Thus standard measure-
ment equipment can be connected directly. Devices connected to this output should have an in-
put resistance > 10 k
W
.
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