Chapter 3 Laser Diode Driver Module Operation 35
Short
When illuminated, indicates the system has detected a short circuit.
Only detected when the unit is on.
Out of Tol
When illuminated, indicates the unit is out of tolerance as defined
by the
Tol Time
and
Tol Iop
setings in the Laser Setup Screen.
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.
Figure 19 - Laser Setup Screen
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.
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