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Chapter 5
range from 0.001 seconds to 50 seconds. The Tol Temp value is displayed in ºC (the
most common usage), and can range from 0.01 to 10.00. If at any time it goes outside
the tolerance range, the time restarts at zero.
As an example, if the Tol Time is set to 5 seconds, the Tol Temp is set to 0.2ºC, and
the temperature set point was 25.0ºC, the TEC module would have to stay within
24.8ºC and 25.2ºC to be within tolerance. Out of tolerance is indicated by a OutT
status field on the bottom of the TEC Main Screen.
The out of tolerance condition is most often used to shutdown laser outputs when a
TEC is not operating within tolerance. This can be done in one of two ways. The
first, and simplest, would be to define a link condition with the TEC module as the
source, Out as the condition, Turn Off as the action, and the laser module as the
target.
Alternately, if the system was being operated over IEEE-488 or RS-232, once the
TEC was within tolerance, its OUTOFF register could be set to turn the TEC off
when out of tolerance. Then enable the TEC OFF bit in the laser's OUTOFF register.
This will cause the TEC to shutdown when it goes out of tolerance, and the laser to
shutdown because the TEC is OFF. The disadvantage of this second method would
be that the laser would shutdown if any TEC were off, which might not be the desired
operation. Also, you would have to disable the Out of Tolerance bit in the TEC's
OUTOFF register before you could turn the TEC back on.
5.4.3.6
C1, C2, C3, and Ro
See the section of each of the sensors for a description of how C1, C2, C3, and Ro
are used.
5.4.3.7
The
Pushing the
5.4.4
Link Conditions
The Laser module supports the following link conditions:
and
Soft Keys
(previous) soft key returns to the previous screen, while pressing the
(next) soft key advances to the next screen.
Condition
On
Off
Out Tol
In Tol
I Lim
V Lim
T Lim
Th Lim
Temperature Controller Operation
Description
TEC output is on
TEC output is off
TEC is out of tolerance
TEC is in tolerance
TEC is current limiting
TEC has reached its voltage limit
TEC has exceeded temperature limit (low or high)
TEC has exceeded high temperature limit
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