ILX Lightwave LDC-3700C Series, Руководство пользователя, Страница: 34 / 176

O P E R A T I O N S
Connecting to the Laser Controller
18
LDC-3700C Series
C H A P T E R
2

connection is made (no common connections) no additional jumpers are required.
Figure 2.1 on page 16 shows the recommended connections and shielding for
3-pin lasers (where the common connection is internal to the device). A 4-pin laser
should be connected with the same shielding as shown in Figure 2.1 on page 16,
but the common connection (between the photodiode and the laser) is optional.
Setting the PD bias
The LDC-3700C 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-3700C 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 16 shows the proper earth-ground shielding for laser
diode/photodiode connections.