Operating A Mld203Cxxe Module (Cc) - THORLABS MLDEVAL User Manual

MLDEVAL

5 Operating a MLD203CxxE Module (CC)

1. Set the mode switches SW4.1 to 4.2 (4):
SW4.1 Pset / Iset
SW4.2 Mod. In
SW4.3 Comp
SW4.4 Comp
2. Set the potentiometer P2 (10) to the left stop by turning it counter-clockwise. This position
refers to the minimum laser current.
3. Insert the MLD203CHBE (MLD203CLNE) into the sockets J8/J9 (3). Make sure that the
white triangle matches with pin 1 of the adapter PCB.
4. Connect the laser diode
· Free wiring: Connect the laser diode to the screw terminal (8) to Anode and Cathode,
accordingly.
· Strain relief cable of SR9x Series - you can use any of the cables:
SR9A
SR9B
SR9C
SR9D
SR9F
Connect the blue and white wires to Anode and Cathode of the screw terminal (8) in
accordance with the delivered with the SR9x cable documentation.
· Strain relief cable of the SR9x-DB9 Series - you can use any of the cables:
SR9A-DB9 - pin codes A and E
SR9B-DB9 - pin codes B and H
SR9C-DB9 - pin code C
SR9D-DB9 - pin code D
SR9F-DB9 - pin codes F and G
Set the pin code selector switches SW2 and SW3 (6) to match the pin code of your laser.
Connect the DSUB plug to the DB9 output connector (7)
5. Make sure that SW1 (9) is set to off.
6. Connect the power supply (external 5 V DC via or a USB power) to the MLDEVAL.
7. The laser diode current can be monitored at the J6 Mon. Current Connector (13) by meas-
uring the voltage at this connector. The conversion coefficient is 1 V/A, so the current is cal-
culated by
8. Set SW1 (9) to ON. The green LED1 next to SW1 lights up.
9. Turn the potentiometer P2 clockwise in order to increase the laser current. This way, the
control voltage at the I
and the internal reference voltage V
Warning
Make sure you observe the laser current while turning the potentiometer P2! At its right stop the
laser current will reach the maximum value of 200 mA! In the case you need to limit the laser
8
ON
OFF
OFF
OFF
input of the MLD203CxxE module can be changed between 0
SET
(2.5 V DC).
REF
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