Testing TM Modules

The thermomechanical modules are largely passive components. Each hybrids has 2 resistors (0.68 Ohm) to dissipate heat where the HCC would be. The total resistance of the hybrid between the powering pads should be ~3.8 Ohms. The powerboard drops the voltage from the stave voltage to the hybrid voltage, measures the temperature, and acts as a DVM.

Wire Bonding

The module is placed in the test frame (same test frames used for electrical modules). The powerboard is bonded to the test frame and to the hybrids shown in the diagram below.

Testing TM Modules

The testing is done with an Arduino circuit with a voltage shifter. The Powerboard communicates with 1-Wire with the Arduino. It takes a number between 0-255 which sets the voltage the hybrids see. It then outputs a temperature reading and a PTAT reading.

-- Tom-Erik Haugen - 2017-06-15

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