Thermoelectric transfer difference of thermal converters measured with a Josephson source

We have measured the thermoelectric transfer difference of two thermal volt age converters using a Josephson source and compared the results to similar measurements made with a conventional semiconductor source, Both sources u se the fast reversed de method. The Josephson source is an array of 16384 s uperconductor-normal-superconductor Josephson junctions that is rapidly swi tched between voltage states of +0.5, 0, and -0.5 V, A marginally significa nt difference is detected between measurements with the two different sourc es.