I N S T A L L A T I O N A N D O P E R A T I O N
Introduction to the LDX-3500 Series Front Panel
3_03
LDX-3500 Series
17
C H A P T E R
2
The Laser Connectors
At the left of center, when facing the back panel, you will find a 9-pin D-sub
connector for the laser diode connections. The pinout diagram for this connector
is shown in Figure 2.3.
Figure 2.3
Back Panel LD Controller
The Interlock pins must be shorted in order to turn the LDX-3500 Series Precision
Current Source output on.
The Photodiode BNC connector may also be used instead of pins 6 and 7 of the
D-sub connector. The PD Cathode (+) is on the center connection to the BNC,
and the PD Anode (-) is on the outer connection to the BNC.
Analog Output
An analog output signal is available at the ANALOG OUTPUT connector (BNC)
on the back panel. This signal is a voltage between 0 - 10 volts which is
proportional to the output current. For example, an analog output signal of 5 volts
would represent an output current of about 50% of full scale.
Connecting to Your Laser
When connecting laser diodes and other sensitive devices to the LDX-3500
Series Precision Current Source, we recommend that the unit be powered up and
the LASER output be off (OUTPUT ON LED unlit). In this condition, a low
impedance shunt is active across the output terminals. When disconnecting
devices, it is only necessary to turn the LASER Output off.
Key Switch
The back panel ENABLE key switch is used to enable/disable the current output.
The key must be turned clockwise for the laser output current to turn on. If this
switch is in the off position, the front panel INTLK/ENBL error indicator will be lit.
1, 2
Interlock
3
Chassis Ground
4, 5
Laser Cathode
6
PD Cathode (+)
7
PD Anode (-)
8, 9
Laser Anode
1
2
3
4
5
7
8
9
6
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