Operation: Cooling and dry air
Currently, a Julabo FP40 chiller is available for DUT cooling. It operates with a coolant mixture of water and Ethanol which is pumped through a cooling plate in a closed loop. The setup can reach DUT temperatures of down to -15...-20 °C depending on the thermal interface and the DUT heat dissipation. A temperature sensor is mounted to the cooling plate and provides precise temperature feedback to the chiller, resulting in typically less than 0.1 °C variation.
The cooling plate is prepared to accommodate FE-I4-sized PCBs with 4 mounting holes spaced 10 cm apart vertically and horizontally. The top surface is flat and requires a DUT-specific custom made heat transfer block, which has to be provided by the user.
A CAD drawing of the cooling plate can be found here: Kühlplatte_130x110x15_für_Alurippen_v2.pdf
To prevent ice formation on the DUT or carrier PCB, the cooling plate can be placed in a sealed foam box. Two different sizes are available with approximate 15x15 cm² and 20x30 cm² and about 7 cm height. Both boxes are quipped with Polyimide windows (aka Kapton). The cooling boxes can be flooded with up to 15 l/min dry air or Nitrogen to keep the humidity low during the irradiation.