O P E R A T I O N S
Operating from the Front Panel
16
LDC-3926339
C H A P T E R
2
5d
Using the Adjust knob or the numeric keypad, set the Ilim value and press
ENTER
.
The current limit protects the laser by never allowing the drive current to exceed the Ilim
value, independent of the current set point, modulation, or the controller mode (Constant
Current or Constant Power).
Failure to set and ensure a proper Ilim value could result in laser damage.
6
Set the laser current setpoint (Iset).
6a
Press
PREV
to select the current source setpoint (
Iset
) parameter.
6b
Using the Adjust Knob or the numeric keypad, set the Iset value and press
ENTER
.
This parameter sets the laser current source drive value when in Ilbw or Ihbw modes.
7
Enable the modulation and photodiode reverse bias.
7a
Press the Down soft key (F4) until LAS page 3 is displayed.
7b
To turn on Photodiode (PD) Bias parameter, press the INC/DEC keys or use the
Adjust knob. This setting controls the 5 volt reverse voltage to the monitor
photodiode.
7c
Press
NEXT
to highlight Modulation. The Modulation parameter allows you to
activate or deactivate the modulation input.
Note:
If the modulation frequency is greater the 27 kHz, operate the module in high
bandwidth mode (Ihbw).
7d
Use the INC/DEC keys or the Adjust knob to turn on the modulation input. see
Specifications
on page
4
for modulation input specifications and limitations.
Figure 2.7
Modulation On/Off Screen, Laser Page 3
8
Press the F1 softkey on any of the three pages of the LAS setup menu to turn on or off the
laser current source.
Also, you can turn on the current source with the F1 soft key from the CHAN menu. For
safety, the ON toggle has a two-second delay before the current source is enabled.
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