O P E R A T I O N S
Connecting to the TE Controller
14
LDC-3700 Series
C H A P T E R
2
Setting the PD bias
The LDC−3700B Series Laser Diode Controller provides an adjustable reverse bias of 0 − 5 VDC for
the photodiode. To set the photodiode bias to 5 volts reverse bias, turn the back panel
PHOTODIODE BIAS ADJUST fully clockwise. To set the photodiode bias to 0 volts reverse bias,
turn the back panel PHOTODIODE BIAS ADJUST fully counter−clockwise
Grounding considerations
The LASER outputs of the LDC−3700B Series Laser Diode Controller are isolated from chassis
ground allowing either output terminal to be grounded at the user’s option. Figure 2.1 on page 12
shows the proper earth−ground shielding for laser diode/photodiode connections.
Connecting to the TE Controller
The 15 pin connector marked TE CONTROLLER on the rear panel of your Controller, is used to
make connections to the thermoelectric (TE) modules of your laser or laser mount, and the
temperature sensor. There are connections provided for TE module, TE module shield, TE sensor,
digital and analog ground, and a special TE booster feature connection. The pinout diagram for this
connector is shown in Figure 2.3 on page 14.
Figure 2.3
Rear Panel TEC Connector
Pins 1 and 2, and 3 and 4, are connected together in pairs internally to allow high current flow to the
TEC module (Peltier device). Pins 7 and 8 are connected to the sensor (i.e. thermistor). Pins 9
through 15 are normally not used and should be left unconnected. They are intended for use with an
external TE Booster.
TEC Grounding Considerations
The TEC outputs of the LDC−3700B Series are isolated from chassis ground, allowing either output
terminal to be grounded. If a terminal is grounded, make sure to connect it only to the Earth ground.
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