4 – 30
Remote Operation
sponding limit,
APLC
YES
causes the laser current source to shut
down.
Note that this trip is implemented in firmware, and can only respond
over several hundred ms. The user should always rely on voltage
limiting (
SVLM
) and current limiting (
SILM
) of the laser diode itself
to assure safe device operation.
Front panel:
LD :/@ABB
48
.
APLC NO
Example:
Laser Trip-o
ff
on TEC O
ff
ATOF(?)
{
z
}
Set (query) the laser to trip o
ff
if the TEC turns o
ff
{
to
z
=
(
NO 0
,
YES
1
)
}
.
If set to
ATOF
YES
, the LDC500 requires the TEC controller to be
active for the laser to operate. If the TEC is turned o
ff
or trips o
ff
for
any reason,
ATOF
YES
causes the laser diode to shut down as well.
Front panel:
LD :/@ABB
A 4C
.
ATOF YES
Example:
Laser Trip-o
ff
on Max Temperature
ATMX(?)
{
z
}
Set (query) the laser to trip o
ff
if the maximum temperature is ex-
ceeded
{
to
z
=
(
NO 0
,
YES 1
)
}
.
If set to
ATMX
YES
, the LDC500 requires the TEC temperature sensor
to remain below the
TMAX
setting. Note that the TEC controller
does not need to be active, but the temperature sensor must remain
connected and in-range, as well as reading below
TMAX
, if
ATMX
YES
is set.
Note that if the LDC500 is operating with the sensor model set to
“none” (resistance units), then arming
ATMX
will cause shut-down
if the sensor
TRAW?
value is greater than
TRMX
, in k
Ω
. If the sensor
has a negative temperature coe
ffi
cient, this will correspond to the
lowest
temperature of the operating band,
not
the greatest.
Front panel:
LD :/@ABB
E 4C
.
ATMX YES
Example:
LDC500 Series Laser Diode Controllers
