Evaluation of AC-DC differences of NML single-junction thermal voltage converters at frequencies up to 1 MHz

The paper presents the results of the evaluation of frequency dependent AC-DC transfer differences for a new set of single-junction thermal converters that serve at NML as primary standards for AC-DC transfer. The new evaluation described has led to a reduction of the 1-/spl sigma/ measurement uncertainty from 30 ppm to less than 10 ppm at frequencies up to 1 MHz.