Current Control Mode; Display; Figure 2.3A - The Setpoint Current; Figure 2.3B - The Measured Current - Newport LDC-3706 Series User Manual

Current Control Mode

SELECT Button (Right) – Selects constant current or constant power mode. The selected mode is
indicated by an illuminated LED. The output is disabled when the control mode is changed.
ON Button (Right) – Enables and disables the current output. An enabled output is indicated by an
illumined LED above the ON button (right). A disabled output is indicated by an unlit LED above the
ON button (right).

CURRENT – Controls the LDC-3706 current source to constant operating current.

POWER – Controls the LDC-3706 to a constant power or constant photodiode
current.
LASER RANGE Button (Right) – Selects between the output ranges of the LDC-3706 instruments.
Range 1
Range 2
Range 3

Display

The two large 7-segment VFD displays show the measured value in the selected operating mode.
When the setpoint is being adjusted, the 7-segment LED display will show "set" after the units
dimension and revert back to reporting the measured value after the three second timeout. The dot
matrix display at the bottom of the screen cycles through available measurements and the mode
setpoint. The available measurement and setpoint parameters are listed under General Operation
Procedures section in this chapter.
The setpoint values are indicated by a colon, as in Figure 2.3a, and the measured values are
indicated by an equal sign, as in Figure 2.3b.
Figure 2.3a – Setpoint Current
Temperature Controller Display
LEFT Button (Left) – Cycles left-half of the left-hand (TEC) display through the available
temperature controller measurement and setpoint parameters that can be displayed.
RIGHT Button (Left) – Cycles right-half of the left-hand (TEC) display through the available
temperature controller measurement and setpoint parameters that can be displayed
Laser Current Source Display
LEFT Button (Right) – Cycles left-half of the right-hand (Laser) display through the available
laser current source measurement and setpoint parameters that can be displayed
RIGHT Button (Right) – Cycles right-half of the right-hand (Laser) display through the
available laser current source measurement and setpoint parameters that can be displayed
When the same parameter is displayed on the left and right display the LDC-3706 will provide the
maximum resolution allowed.
December 2019
LDC-3726 LDC-3736
0 - 100 mA 0 - 1 A
0 - 200 mA 0 - 2 A
0 - 500 mA 0 - 4 A
25
LDC-37620
0 - 10 A
0 - 20 A
―
Figure 2.3b – Measured Current
LDC-3706 Series Laser Controller