3.2 Setting the current limit "ILIM"
LDC2xx / page 15
3.2 Setting the current limit "I
LIM
"
Before operating a laser diode always set the lim it for the injection current to protect
the laser diode against destruction by operating errors.
Switch on the unit with the button "LINE" (L11).
If the unit had already been switched on before switch off the laser current with the
key "ON" (L9).
Select parameter "I
LIM
" with the button (L18) or (L19).
Use a screwdriver to set the desired current with the potentiometer "LIM I" (L12).
NOTE:
The current limit can be displayed at any time by selecting the parameter
"I
LIM
".
If the laser current reaches the set current limit "I
LIM
" during operation the LED "LIM"
(L7) lights up and a short beep gives a warning.
The current limit can also be adjusted with the output swit ched on. In any case you
should avoid an adjustment when the LED "LIM" (L7) lights up.
3.3 Selecting the laser diode polarity
With the laser diode controller LDC2xx all possible polarities of the laser diode and
the monitor diode can be used. The lase r diode will always be sourced with respect
to ground. Compared to a floating driv
er stage this operat ion mode has the
advantages of higher security for the la ser diode and better stability and lower noise
of the laser current.
Prior to turn on the laser current the correct polarity of the laser diode must be
selected:
