OPERATION
General Operating Procedures
34 LDC-3900 Series
CHAPTER 2
Modulation from Front Connector
The Modulation from Front connector allows a modulation signal to be passed
from the front panel to the back, and jumpered to a Laser module in one of the
four module bays. See the Laser module instruction manual for details on
modulation.
Earth Ground Connector
The LDC-3900 provides an earth ground connector for your convenience. It is
located above the AC Power Entry Module. The TEC and Laser outputs are
isolated from chassis ground. Refer to the module instruction manuals for
information concerning grounding.
General Operating Procedures
The following sections present some guidelines for operation, as well as some
common operating procedures. Remote operations are discussed in Chapter 4.
Warm-up and Environmental Considerations
Operate the LDC-3900 Modular Laser Diode Controller at an ambient temperature
in the range of 0 to +40
×C. Storage temperatures should be in the range of -40 to
+70
×C. To achieve rated accuracy, let the LDC-3900 Modular Laser Diode
Controller warm up for about 1 hour before use.
TEC Mode Operation
You can operate the TEC controller portion of the LDC-3900 Modular Laser Diode
Controller in several modes, constant T, constant R, or constant I
TE
. This example
is for constant T mode, the most commonly used mode. However, the other
operating modes follow similar procedures.
1 Plug the LDC-3900 Modular Laser Diode Controller into an AC power source supplying
the correct voltage and frequency for your unit (refer to the back panel for the correct
ratings).
2 Turn on the LDC-3900. The TEC Output stage(s) will be off at power-up and the unit will
automatically configure its parameters to the state which existed when the power was last
shut off (if possible). If the LDC-3900 detects that its modular configuration has changed,
it will configure the parameters in the default states.
3 Check the setting of the SENSOR Select switches for the desired operation. The sensor
code (for the selected TEC channel) will be shown on the TEC display for three seconds
during the power-up sequence (see Power-Up Sequence on page 6).
4 Press the LAS/TEC switch in the Adjust section of the front panel to select the TEC
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