O P E R A T I O N S
Operating the TE Controller from the Front Panel
24
LDC-3700 Series
C H A P T E R
2
Operating the TE Controller from the Front Panel
This section describes how to operate your LDC−3700B Series Controller Temperature Controller in
Constant Temperature Mode,
T
. There are several modes in which you can operate the temperature
controller, Constant Temperature, Constant Resistance (Sensor), and Constant I
TE
(TE module
current). Operating in Constant Temperature Mode is presented in the following sections, however
the same operating principles apply to the other operating modes.
The TEC display
The
TEC display
is used to show TEC control parameter values such as temperature, °C,
temperature limit, I
TE
limit (A), thermistor resistance (k
Ω
), and TE current (A) measured and set
point values. It may also display errors which relate to TEC operation. Error indicators underneath
the
TEC
display indicate control errors and are explained in the section titled "TEC ERROR
INDICATORS". All TEC control parameters are displayed on this portion of the controller’s display
section with the appropriate enunciator illuminated. In the case of the temperature sensor constants,
the
LASER
display section displays which constant you are viewing or adjusting (C1, C2 or C3) and
the
TEC
display section displays the value.
Operating the Controller in Temperature Mode, T
Suppose you need to operate and temperature control a telecom laser with an internal TE module.
The maximum TE module operating current for this device is 4 Amps. A typical operating mode
would be to control the laser diode temperature to 35 °C with the temperature sensor type being a
10K thermistor. In this experiment, the maximum operating temperature will be 40
°C. To configure
the LDC−3700B Controller, you will need to select a sensor type and the sensor current range via the
rear panel, enter the correct thermistor constants, select the Temperature Control mode, set the
control loop gain, and set appropriate temperature and TE module current limits.
Setting up the Temperature Controller
Set the LDC−3700B in Temperature Control mode by selecting
T
in the
TEC
MODE
section of the
front panel. Do this by toggling the
SELECT
push button until the
T
indicator is illuminated.
Repeatedly pressing the
SELECT
switch cycles through the
T
(temperature),
R
(resistance/sensor),
and
I
TE
(TE module current) instrument operating modes.
TE CURRENT LIMIT
TE MODULE OPEN
TEMP LIMIT
SENSOR OPEN
A
TEC
° C
Ω
k
TEC MODE
ON
R
I
TE
T
OUTPUT
SELECT
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