© 2015 Thorlabs
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LDC200C Series
4.3 Troubleshooting
In case that your LDC200C Series Controller shows malfunction please check the following
items:
q
Unit does not work at all (no display at the front):
o
LDC2xxC connected properly to the mains?
§
Check the power cord and the
o
LDC2xxC turned on?
§
Turn on your LDC200C Series Controller (button "LINE" F10).
o
Check the
at the rear panel.
§
If blown, replace the fuses with the correct type.
q
The desired laser output power cannot be achieved
o
Is the interlock closed?
§
Check the connection of
pins of the connector jack.
o
Is the laser output turned on ("LASER ON" button)?
§
Change the setting from “OFF” to “ON”. The LED “ON” on the front panel of the
mainframe must light up.
o
Is the current limit I
LIM
set to 0?
§
Adjust the
(potentiometer on the front panel) to an
appropriate value.
o
Is the laser diode installed properly?
§
Check the connection cable.
o
Is the polarity of the laser diode set correctly?
§
If not change the polarity of the diode or select on the LDC2xxC the
.
o
Is the photodiode connected properly?
§
Check the connection cable.
o
Is the photodiode poled correctly?
§
If in constant power mode the displayed photodiode current is negative, the polarity
of the photodiode must be reverted.
o
Are you using a
with the photodiode in photo current mode?
§
Change the polarity of the diode for photo element mode or change the polarity of the
bias voltage source.
o
Is the desired output power set correctly?
§
Check the optical
§
Adjust the desired output power P
LD
using the tuning knob.
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