OPERATIONS
Operating the TE Controller from the Front Panel
28 LDC-3700 Series
CHAPTER 2
The Temperature Controller temperature limit function, LIM T
HI
, sets the maximum temperature the
controller allows before generating an error condition and action. During controller operation, if this
limit is reached, the TEMP LIMIT error indicator will flash and the LASER and TEC output will be
shut off to protect the laser.
Note: The maximum temperature limit becomes the maximum set point temperature as
well.
To set the controller temperature limit to 40 °C, press the (PARAMETER) SELECT switch until the
LIM T
HI
indicator illuminates. Press and hold in the SET switch and turn the ADJUST knob until the
TEC display indicates 40 °C. When the SET switch is released, the new value is stored in non−
volatile memory and becomes the maximum set point value.
Adjusting the Temperature Set Point
Now, you are ready to adjust the set point operating temperature of the controller to 35
o
C. The
LDC−3700B Series Temperature Controller will monitor actual temperature and adjust TE current to
maintain the thermal load at the set point temperature.
To adjust the Temperature Set Point to 35 °C,
set the instrument to TEC mode by pressing the TEC
push button in the ADJUST section. This instrument mode will be indicated by the TEC LED. Turn
theAdjust Knob clockwise to increase the set point (as indicated on the TEC display), or
counterclockwise to decrease the set point. When the adjust knob is turned, the controller
automatically changes to set point mode indicated by the display enunciator flashing. Before
adjusting the set point check the TEC display for proper display mode. The display mode determines
which set point is being adjusted. Adjust the set point temperature to 35 °C. Three seconds after the
set point is adjusted to the new value, the instrument will return to measurement mode. Pressing the
SET switch in the TEC display switch section will also change the controller to set point mode and
display the set point corresponding to the display mode.
Once the sensors, temperature control loop parameters and set points are established, the output of
the temperature controller can be enabled. With the output enabled, as indicated by the ON LED,
the temperature controller will drive current to the TE modules to cool or heat the load depending on
the difference between the set point and the actual temperature. Press the OUTPUT switch once to
enable the TEC output, and again to disable the output. The default condition for the TEC output is
off when the instrument is first powered up.
TEC
LAS
ADJUST
TEC MOD
ON
I
T
OUTPUT
SELECT
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