4 – 46
Remote Operation
TEC Trip-o
ff
on Voltage Limit
TTVL(?)
{
z
}
Set (query) the TEC to trip o
ff
upon exceeding the voltage limit
{
to
z
=
(
NO 0
,
YES 1
)
}
.
The TEC current source has an intrinsic compliance voltage of
±
8.5 V.
If the user needs to assure that the TEC voltage cannot reach that
hardware limit, then
TTVL
,
together with
the
TVLM
command, can
configure the TEC to turn o
ff
when the voltage exceeds the
TVLM
value.
Front panel:
/@ABB
4C
.
TTVL?
Example:
YES
TEC Trip-o
ff
on Current Limit
TTIL(?)
{
z
}
Set (query) the TEC to trip o
ff
upon reaching the current limit
{
to
z
=
(
NO 0
,
YES 1
)
}
.
The TEC current source always limits its magnitude of the output
current to the value set by
TILM
. This limit can be reached during
large temperature transitions (when it essentially imposes a temper-
ature rate limit), or at the ultimate cooling or heating limits of the
thermoelectric cooler being used. Ordinarily, this limiting is a normal
occurance during operation. For certain critical situations, however,
the user may wish the LDC500 to automatically shut down the TEC
if the TEC current limit is reached. The
TTIL
command enables this.
Front panel:
/@ABB
( 48
.
TTIL 0
Example:
4.5.15
Interface commands
Interface commands do not have any front-panel correspondence.
Identify
*IDN?
Query the LDC500 identification string.
The response is formatted as:
Stanford Research Systems,LDC500,s/n******,ver#.##
where
******
is the 6-digit serial number, and
#.##
is the firmware
revision level.
LDC500 Series Laser Diode Controllers
