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A new fourt ee n.ra nge se l of Ih e rma l vo lt age co n ve rt e rs a nd a Ih e rm6e le me nl co mp a ra tor are used to meas ure ac·d c diffe re nce. a nd a·c voltages relati ve to py le rna l d·c sla nrl a rd s, with 20 ppm (pa rts· pe r· milli on) acc uracy a l audi o frequ e nc ies. T he imprec is ion is less th a n 2 ppm. Co rrec ti ons rela ti ve 10 Ih e ve ry s ta ble middl e ra nges ca n be re de te rm ine d for e very ra nge by a se ve n·ste p inle rcompa ri so n of ce rl ai n adjace nl ranges. Key wo rd s : AC ·DC differe nce; co m parato r: Ih e r moe leme nt ; tra nsfe r vo ltm e te r; vo lt age meas ure me nts.

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