Thermostat Function Test - Agilent Technologies 1100 Series Reference Manual

Thermostat Function Test

The thermostat function test is used to evaluate the cooling and heating
performance of the two peltier elements.
Description
When the test is started, both heat exchangers are cooled initially to 25 °C.
This temperature is held for 12 seconds, and then the setpoint is changed to
20 °C. The time required to reach 20 °C is a measure of the cooling efficiency
of the peltier elements. At 3.5 minutes, the setpoint is changed to 30 °C, and
both elements begin heating. The time required to reach 30 °C is a measure of
heating efficiency. A typical thermostat function test profile is shown in
Figure 7.
Temperature [°C]
Left Peltier element
Figure 7
Evaluating the Thermostat Function Test
During the cooling phase, the Peltier elements should cool at a rate of >2 °C
minute. During the heating phase, the temperature change should be
>3 °C/minute. Defective thermostat components may cause cooling or heating
rates to fall outside these limits.
1100 Series TCC Reference Manual
Right Peltier element
Typical Thermostat Function Test Profile
Troubleshooting and Test Functions
Time [minutes]
3
43