Abstract—Progress in the development of an evaluation system
for thermal-transfer standard based on a Josephson waveform
synthesizer at KRISS. The synthesizer adopting a Josephson
junction array, which can generate arbitrary stepwise waveforms
with a number of the quantum-voltage steps up to 2.5-V level
amplitude. With the synthesizer, we have built a sampling voltmeter
that measures the differential voltages between a sinusoidal
waveform produced by a semiconductor-based ac source and the
Josephson waveforms. We will present in the conference that the
developed sampling voltmeter can be utilized as a reference for
ac-dc difference measurements of a thermal transfer standard.
Index Terms—programmable Josephson voltage standard,
sampling voltmeter, thermal transfer standard