0
t
I
Laser
LCT
max
LCT
LZTR
LZTR
LZTR
: 0 . . . 34000 ms
(default: 300 ms)
Figure 5.1:
Laser current on-off ramp in CW mode. The ramp is active at any change
of laser current.
When
using
the
RS232
interface
the
command
LR
may
be
used
to
switch
the
laser
on.
The
command
LS
switches
the
laser
off.
5.2.2 Current Ramp to Laser Current Set-Point
In
CW
mode
the
ramp
on
laser
run
and
stop
is
activated
by
default.
However,
this
function
is
not
available
over
the
display
menus.
To use this feature,
you
need
to
control
the
driver
over
an
RS232
interface.
With
e.
g.
LZTR2000
you
can
set
the
time
to
reach
the
maximum
current
set-point for you laser diode.
The
slope
of
the
ramp
w
ill
be
LCT
max/2000
ms
in
this
example.
During
the
laser
stop
ramp,
you
can
turn
off
the
laser
immediately
by
sending
LS
command
again.
You
can
disable
the
ramp
with
LZTR0
.
The
default
value
for
LZTR
is
300
ms.
shows
how
LZTR
works.
For
a
list
of
other
commands
see
5.2.3 Laser APC Power Control Mode
The
power
control
mode
is
only
available
in
CW
mode
and
consists
of
two
independent
parts:
•
T
he
photo
-
current
control
loop
•
T
he
laser
power
coefficients
which
do
a
translation
from
a
power
value
into
a
value
for
the
photo
-
current
To
initiate
the
APC
power
control
you
must
first
prepare
the
laser
for
proper
operation
in
CW
mode
(see
Don’t
forget
to
adjust
the
laser
current
limit.
18
Содержание Laser Lab Source LDC Series
Страница 1: ...Operating Manual LDI LDC and TEC Series Laser Diode Drivers and TEC Controllers...
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