Page 24 ·
TECPak
User’s Manual
Controlling the Temperature Rate of Change
Some applications require that temperature is changed at a specific rate to
prevent damage that might otherwise come from rapid changes in device
temperature. Using the TEC:TRATE command, it is possible to control the
temperature ramp rate of the controller, limiting the rate of change to specific
degrees Celsius per minute.
Because the temperature rate function relies on the instrument tracking a
gradually changing set point, a proper gain setting (or PID values) is important
to achieve a smooth and continuous temperature transition.
To disable the temperature rate function, simply set the rate to 0 with a
‘TEC:TRATE 0’ command.
External Fan Control
The
TECPak
has a built-in user adjustable DC power supply designed to
provide up to 350mA to an external fan, such as those built into the
240 and 280
Series
LaserMounts
. When using the
TECPak
with mounts that require a fan,
no additional external power supply is needed, but a cable with appropriate
wiring for the fan, such as the
1260B or 1262B TECSource Cable
, must be
used.
The fan is controlled via the TEC:FAN command, or via the
Settings…
dialog in
Arroyo Control
.
Speed can be set to
Off
,
Slow
,
Medium
,
Fast
, or a value between 4 and 12
(volts). When set to
Off
, the fan power is never turned on.
Slow
,
Medium
, and
Fast
correspond to 6.5V, 7.5V, and 8.5V, respectively.
There are five modes:
1
Fan is turned on whenever the TEC output is on, and turns off when the
TEC output is turned off.
2
Fan is always on.
3
Similar to mode 1, the fan is turned on whenever the TEC output is on,
but when the TEC is turned off, the fan will remaining running for an
addition number of minutes as defined by the
Ext Fan Off
setting.
4
Fan is turned on whenever the TEC output is on and cooling, off
otherwise.
5
Fan is turned on whenever the TEC output is on and heating, off
otherwise.
When used,
Delay
is in minutes, and can be from 1 to 240.
