THORLABS ITC502 Operation Manual page 113

Is the correct temperature sensor connected properly and is the temperature set
accordingly at the front panel or with the
Check the corresponding connections and polarities of the temperature
sensor (refer to chapter 1.9.6, "Connecting a TEC element" on page 25)
Do you have chosen the right temperature sensor?
Select the corresponding temperature sensor manually or with the
":SENS AD/THL/THH"
Enter the right set-value for resistance manually or by the
":RESI:SET<NR3>"
Is the TEC hardware current limit set to 0?
Adjust it with the ITEC LIM potentiometer to an appropriate value
Set temperature differs from actual temperature (of the laser)
Is the temperature not stable?
Adjust the corresponding PID-parameters carefully (refer to 2.15.4, "PID
adjustment" on page 45)
If you don't find the error source by means of the trouble shooting list please first
connect the
Thorlabs-Hotline
repair to Thorlabs-Germany.
(refer to section 7, "Addresses " on page 114)
":TEMP:SET<NR3>"
command.
command.
before sending the whole system for checkup and
4.5 Trouble-shooting
command?
ITC500 / page 105