Laser Diode Connection; Interlock Connections; Four-Wire Voltage Sense; Figure 2.2 Back Panel Laser Diode Connector - ILX Lightwave LDC-3926339 User Manual

6a current source module

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O P E R A T I O N S

C H A P T E R

Connecting to the Laser Current Source

Laser Diode Connection

A Combo-D connector on the rear panel of the current source module is used to

connect laser diodes to the module. There are connections provided for laser

cathode and anode, photodiode cathode and anode, chassis ground, interlock,

and laser forward voltage.

To enable the laser output, a short must exist between the Interlock pins (pins 1

and 2) of the connector. The short can be a direct short across the pins or a switch

to prevent laser operation until the switch is closed. If laser output is turned on

without a short between pins 1 and 2, an error appears for the respective channel

on any of the laser set-up pages or on the status screen. Furthermore, the output

is turned off and error E501 (see Front panel Error Indicators on page 79) appears

if the interlock is disconnected.

The interlock terminals on the laser connector, pins 1 and 2, must be isolated from all

other connections including earth ground.

The LDC-3926339 has a 4-wire voltage sense feature. The laser voltage is

sensed through a pair of connections (pins 4 and 9) that are separate from the

laser current drive connections (pins A2 and A3). This allows a more accurate

laser voltage reading. All four of these pins (4, A2 , 9, A3) must be connected for

the module to operate. For more information about 4-wire Voltage Sense, see

Tech Note #TN3916-2. Contact ILX Lightwave Customer Service (see page xii for

LDC-3926339

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