THORLABS ITC502 Operation Manual page 112

4.5 Trouble-shooting
If not, change the polarity at the front panel, with the
command or change the connection at the laser output jack.
Is the photo diode connected properly?
Check the connecting cable.
Is the photo diode poled correctly?
If not, change the polarity with the
the front panel of the unit.
Are you using a bias voltage with the photo diode in photocurrent mode?
Turn off bias voltage manually, with the
change the polarity of the diode for photo element mode.
Is the desired output power programmed correctly?
Turn to constant power mode and adjust the desired output power P
the tuning knob or with the
Is the ITC5xx running in temperature protection mode?
Check if the temperature window is set correctly.
Check if the laser temperature is out of window (laser is then switched off
automatically).
You don't get the desired operation temperature
Is the TEC connected properly to the connector?
Check all cables.
Check the correct polarity (see section 2.14 on page 41)
Do you have turned on the temperature controller manually or by the
ON/OFF"
Change the status setting from "off" to "on".
The LED "ON" on the front panel of the module must be on
ITC500 / page 104
":POPT:SET<NR3>"
command?
":LDPOL AG/CG"
":PDPOL AG/CG"
":PDBIA OFF"
command or at
command or
with
LD
command.
":TEC