A generator device for converting thermal energy to electric energy. The pacing device is configured to operate in a watch mode and a test mode having a plurality of test mode sections. An actuator is fast at one end with the substrate and extends into the nozzle chamber. The size of the window may be accurately determined from the resulting photograph using the associated reference strip. The eutectic alloy of aluminum and germanium bonds the bottom cell of the germanium-containing material to a supporting substrate. The radiation delivery module may also include a radiation source translator so that the radiation spot moves in a direction generally perpendicular to the length of the radiation spot.