© 2018 Thorlabs
32
ITC4000 Series
3.6.2 Thermopile Input
For voltage sensors like thermopiles the following parameters can be set:
Parameter
Selection
Description
Input Route
DSUB connector or Rear Panel
BNC
configures which input connector is used
Range
10mV, 100mV, 1V or 10V
depending on nominal voltage of the used
voltage sensor
Response
entered in mV/W
is used to display a calibrated power value
For using thermopile sensors please choose thermopile input as power feedback source de-
scribed in section
Setting the LD source parameters
.
Input Route:
The Input Route determines the used thermopile input. The Input Route will be the contacts 1
and 2 of the 13W3 Mixed DSUB jack "LASER OUTPUT" (R9) or the BNC jack "OPT SENSOR
IN" (R4) on rear. For using the 13W3 DSUB jack "LASER OUTPUT" please select DSUB con-
nector. In other case please select Rear Panel BNC.
Note
If the photodiode input route is set to the Rear Panel BNC a settings conflict will be shown. In
this case set the photodiode input route to DSUB connector.
Range:
Four voltage ranges from 10mV to 10V are offered. For thermopile sensors, the 10mV or
100mV ranges are recommended. For other voltage sensors, sensor amplifiers or power
meters, you can also use the 1V or 10V ranges depending on the maximum output voltage.
Response:
The thermopile responsivity value is used for a calibrated power adjustment. The possible ad-
justment range is 0.01mV/W to 500 V/W. With this parameter set correctly, the optical output
power can be displayed in Watts. The resulting sensor voltage set point will be calculated auto-
matically by the ITC4000.
27
