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3.1 Presettings
LDC340 / Page 13
SW8
defines the range of the monitor diode current
Depending on the type of monitor current and the power range you are working in
your monitor diode will deliver a monitor current in a wide range. Therefore the
LDC340 provides two monitor current ranges:
I
PD
range
SW8
high
up
low
down
3.1.2 Setting the limit of the laser current I
LD LIM
To protect the laser diode the maximum possible current at the output of the LDC340
can be limited.
This hardware limit is set by the 25-turn potentiometer marked ADJ located next to
the LED I
LD LIM
at the front of the LDC340. The hardware limit is displayed
continuously on the display if the display I
LD LIM
is selected.
3.1.3 Setting the limit of the monitor diode current I
PD LIM
To protect the laser diode the maximum possible optical output power can be limited.
Therefore a maximum monitor diode current can be set.
This maximum monitor current is set with the 25-turn potentiometer marked ADJ
located next to the LED I
PD LIM
at the front of the LDC340. The maximum monitor
current is displayed continuously on the display if the display I
PD LIM
is selected.
Attention
The monitor diode current limit has a slow reaction time so you
might see overshoots in some special cases. This overshoots are
limited by the laser diode current limit according 3.1.2.