Temperature Control Mode; Laser Current Source Setup - Newport LDC-3706 Series User Manual

Temperature Control Mode

SELECT Button (Middle) – Selects constant temperature, constant sensor and constant current
mode. The selected mode is indicated by an illuminated LED. The output is disabled when the
control mode is changed.
ON Button (Left) – Enables and disables the temperature controller output. An enabled output is
indicated by an illumined LED above the ON button (left). A disabled output is indicated by an unlit
LED above the ON button (left).

TEMPERATURE – Sets the LDC-3706 temperature controller to maintain a constant
temperature

SENSOR – Controls the LDC-3706 temperature controller to a constant sensor value

TE CURRENT – Sets the LDC-3706 temperature controller to output a constant
current

HEAT – Illuminated when negative current is flowing

COOL– Illuminated when positive current is flowing

TEMP LIMIT – Illuminated if the LDC-3706 has exceeded the user defined
temperature limits

CURRENT LIMIT (Left) – Illuminated if the LDC-3706 temperature controller has
reached the user defined current limit

Laser Current Source Setup

LASER Button Uses a menu system for temperature controller setup functions including limits and
–
modulation state. The SET (right) button selects each menu item and a second SET (right) press
allows the user to adjust each parameter. The ADJUST knob can be used to cycle through and
select or modify the following parameters:
For the best laser diode protection it is recommend to set the current limit slightly
above the expected operating current this should be below the maximum current as
stated on the laser diode datasheet. In addition the voltage limit should be set to
just above the typical operating voltage this should also be below the maximum
voltage as stated on the laser diode datasheet.
Limits: The limits for the Laser Current source are divided into three different limits which are
accessible at the top of the laser menu:



December 2019
Laser Current Limit
Laser Voltage Limit
Laser Power Limit
23 LDC-3706 Series Laser Controller