O P E R A T I O N S
Operating from the Front Panel
04_09
LDC-3700C Series
21
C H A P T E R
2
Set the Range
Next, in the
RANGE
section set the laser controller's current source range by
selecting the 200 mA range indicated by the accompanying LED. You will need to
press the
SELECT
push button twice to change the range. It must be pressed
twice quickly (within less than 1 second) to switch between modes, and the
LASER output must be off (LASER MODE ON indicator unlit) in order to change
ranges.
Select the Laser Display
Configure the display so that it reads in mA by selecting
I
in the
LASER
DISPLAY
section of the front panel (directly underneath the
LASER
display. The
enunciators next to the display will indicate the display mode (mA illuminates
when "I" is pressed). The
LASER DISPLAY
switch
section
is also used to select
the
I
PD
(photodiode current, µA),
P
PD
(laser power, mW), or
V
(forward voltage, V)
measurement or set point values. The
SET
switch can be used to view the set
point of any of the
LASER
DISPLAY
parameters. When the (
LASER
DISPLAY
)
SET
switch is pressed, a display set point value is indicated by the corresponding
display mode enunciator flashing.
At this point the Controller is in Constant Current Mode, (I), in the 200 mA range,
and the display is reading in mA. Next, we need to adjust the set point of the laser
current source. The controller can be changed to set point mode a couple of ways.
Adjusting the Set Point
To adjust the set point of the Controller current source to 150 mA, set the
instrument to
LAS
mode by pressing the appropriate push button in the
ADJUST
section of the front panel. The
LAS
indicator will be illuminated. Turn the adjust
knob clockwise to increase the set point (as indicated on the
LASER
display), or
counterclockwise to decrease the set point. When the
ADJUST
knob is turned,
the controller automatically changes to set point mode indicated by the display
mode enunciator flashing. Before adjusting the set point check the
LASER
display
for proper display mode; the display mode determines which set point is being
adjusted. Adjust the set point to 150 mA. Pressing the
SET
switch in the
LASER
PRESS TW ICE
2 0 0 m A
5 0 0 m A
RANGE
LA SER D ISPLA Y
I
I
PD
P
PD
V
SET
Summary of Contents for LDC-3700C Series
Page 2: ......
Page 8: ...L I S T O F FIG U R E S vi LDC 3700C Series...
Page 10: ...L I S T O F TA B L E S viii LDC 3700C Series...
Page 78: ...RE M O T E O PE R A T I ON Command Syntax 62 LDC 3700C Series C H A P T E R 3...
Page 150: ...C O M M A N D RE F E R E N C E Command Reference 134 LDC 3700C Series C H A P T E R 4...