Chapter 4 Temperature Controller Module Operation 49
Heating
/
Cooling
When illuminated, indicates that the TEC is heating or cooling.
Out of Tol
When illuminated, indicates that the TEC is out of tolerance as
defined by
Tol Time
and
Tol Temp
in the setup screen.
4.4.3 TEC Setup Screen
The TEC Setup screen is shown in Figure 25. Each section is described below in
detail.
Figure 25 - TEC Setup Screen
4.4.3.1 Sensor
Selects the temperature sensor type used in your TEC mount. If the
None
type (not
available in the dual TEC module) is selected, only the I
TE
mode is allowed. This
type is intended for applications running without a temperature sensor. After
selecting desired sensor. See the following sections for discussions of the various
sensor types. All TEC modules support the thermistor sensors (10µA and 100µA
range). Single channel TEC modules add support for the AD590, LM335, and RTD
sensors.
4.4.3.2 Gain
The Gain function controls two parameters of the hybrid PI control loop;
proportional gain and integration time.
When the actual temperature and the set point are different, an error voltage is
generated. This error voltage is directly related to the difference in the actual and set
point temperatures. The error voltage is then amplified by the proportional gain.
This amplified error voltage controls the amount of current driven through the TEC.
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