Copyright © 2017 Thorlabs
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TED4015
3.1.6 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
LDC200C series laser driver. Simply connect the corresponding plug of the laser driver to this
output of the TED4015. 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
.
