Setting The Pd Bias; Front Panel Operation; Digital Display; Adjust Knob - ILX Lightwave LDX-32420 User Manual

High power precision current source

Table of Contents

Setting the PD Bias

The LDX-32420 provides an adjustable reverse bias of 0-5 VDC for the

photodiode. To set the photodiode bias to 5 V reverse bias, turn the back panel

PD BIAS ADJUST fully clockwise. To set the photodiode bias to 0 V reverse bias,

turn the back panel PD BIAS ADJUST fully counter-clockwise.

The 7-segment, LED display is used to show control parameters such as laser

drive current (A), laser current limit (A), laser forward voltage (V), voltage limit (V),

monitor photodiode current (µA), and laser optical power (W) in both setpoint and

measurement modes. It will also display error codes that relate to LASER

operation. Error indicators underneath the display indicate control errors and are

explained in the section titled "ERROR INDICATORS". All laser control

parameters are displayed on this digital display with the appropriate enunciator

illuminated. The select button toggles the display between laser current and

voltage and photodiode power and current measurements.

The adjust knob in the upper right corner of the front panel is used to change

instrument settings such as output current set-point and parameters such as

current and voltage limits. Turn the adjust knob clockwise to increase the

displayed value or counterclockwise to decrease the displayed value. When the

01_10

O P E R A T I O N

Front Panel Operation

C H A P T E R

LDX-32420



Table of Contents