OPERATION
General Operating Procedures
36 LDC-3900 Series
CHAPTER 2

point (operating) current. If it requires changing, turn the knob until the desired value is
displayed.
6 Enable the Laser output by turning the Laser Enable key switch clockwise to the ON
position. Pins 1 and 2 (interlock) of the Laser connector must also be shorted.
7 Turn the Laser output on by pressing the Output switch (for the desired Laser channel).
The unit will automatically drive the laser to the set point current.
8 If multiple Laser modules are to be controlled, repeat steps c - g for the other TEC
channels. During operation, only one Laser channel may be monitored at a time on the
front panel. However, if a Laser module has an error condition, and that Laser channel is
not presently selected, its Channel Indicator will blink (the Laser display Error Indicator
will also blink). Select the Laser channel (with the error condition) via the (Adjust)
LAS/TEC switch. The error condition (and all other information) for that Laser channel will
be displayed.
When the unit is powered off, the state of the unit at power-down is saved in non-volatile
memory. Calibration data are stored in the individual modules.
Simultaneous TEC and Laser Mode Operation
Follow the steps outlined below for each of the operating modes. When both TEC
and Laser modes are in operation, the following should also be considered.
1 When alternating adjustments of the Laser and TEC operations, the corresponding switch
in the Adjust section of the front panel must be pressed.
2 The Save and Recall parameter functions save the Laser and TEC parameters
simultaneously.
3 For channels which contain both a Laser and TEC controller (in one module), see the
module instruction manual for details on Output control.
TEC Booster Mode Operation
You can operate the TEC controller portion of the LDC-3900 Modular Laser Diode
Controller with an external TEC current source (booster). Operation is the same
as described in TEC Mode Operation on page 34, except that when a booster is
present a control signal of +
10.0 volts is used to drive the external TEC current
source. Also, the LIM I value may be increased above the normal operation
maximum of 4.0 Amps, to a maximum of 10.0 Amps.
Refer to the TEC module instruction manual for connecting and operating with an
external booster.
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