Laser Setup Screen; Figure 19 - Laser Setup Screen - Newport 8000 User Manual

Chapter 3
Short
Out of Tol
3.5.3

Laser Setup Screen

The laser setup screen is shown in Figure 19 and described in detail below. Certain
features are not available on some modules.
3.5.3.1 Mode
The Mode setting controls how the laser driver current is controlled. There are three
modes: Io, Im, and Po.
In the Io mode, the active set point is the actual drive current. A set point of 1000
mA will cause the module to drive 1000 mA through the laser diode, assuming the Io
Lim is set at or above 1000 mA.
In Im mode, the set point is the desired amount of photodiode current, in µA. Unlike
the Io mode, Im mode will drive whatever current is necessary though the laser
diode, up to the limit, to achieve the set point photodiode current.
Po mode is simply an extension on the Im mode, allowing the user to operate the
system in milliwatts of power. The photodiode power set point, in mW, is converted
to photodiode current using the PD Resp value from the setup screen.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Laser Diode Driver Module Operation
When illuminated, indicates the system has detected a short circuit.
Only detected when the unit is on.
When illuminated, indicates the unit is out of tolerance as defined
by the Tol Time and Tol Iop setings in the Laser Setup Screen.

Figure 19 - Laser Setup Screen

35