THORLABS LDC200C series User Manual

© 2015 Thorlabs22
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 line voltage setting
o LDC2xxC turned on?
§ Turn on your LDC200C Series Controller (button "LINE" F10).
o Check the fuses 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 interlock 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 ILIM set to 0?
§ Adjust the hardware limit I LIM (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 opposite polarity
.
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 bias voltage 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 power display calibration
§ Adjust the desired output power PLD using the tuning knob.
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THORLABS LDC200C series Specifications

General

Brand	THORLABS
Model	LDC200C series
Category	Controller
Language	English