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However, conventional current comparators for AC and DC typically rely on distinct technologies\u2014electromagnetic induction for AC and superconducting quantum interference devices for DC. This technological divide leads to a fragmented and complex traceability system. Bridging this gap is critical for developing unified current standards that meet the demands of temperature power technologies.\u3000In this work, we present a compact, room-temperature AC\/DC current comparator that integrates a diamond-based magnetometer using nitrogen-vacancy centers. The device achieves a type-A uncertainty at\n                    <jats:inline-formula>\n                      <jats:tex-math>$$\\:{10}^{-8}$$<\/jats:tex-math>\n                    <\/jats:inline-formula>\n                    level, while the expanded uncertainty is at\n                    <jats:inline-formula>\n                      <jats:tex-math>$$\\:{10}^{-6}$$<\/jats:tex-math>\n                    <\/jats:inline-formula>\n                    to\n                    <jats:inline-formula>\n                      <jats:tex-math>$$\\:{10}^{-7}\\:$$<\/jats:tex-math>\n                    <\/jats:inline-formula>\n                    level, for both AC and DC signals and supports a system bandwidth up to\n                    <jats:inline-formula>\n                      <jats:tex-math>$$\\:300\\:\\text{ }\\text{H}\\text{z}$$<\/jats:tex-math>\n                    <\/jats:inline-formula>\n                    , without the need for cryogenics. It is comparable to the performance of typical AC comparators, and provides a compact and room-temperature operating platform for further performance improvement. This unified, cryogenics-free solution not only enhances precision and versatility but also expands the applicability of the system to DC resistance bridges in quantum electrical standards.\n                  <\/jats:p>","DOI":"10.1038\/s41598-026-58868-2","type":"journal-article","created":{"date-parts":[[2026,8,11]],"date-time":"2026-08-11T09:03:36Z","timestamp":1786439016000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Current comparator for both AC and DC ratio measurements with 10\u2212\u20098-level type-a uncertainty"],"prefix":"10.1038","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9823-5729","authenticated-orcid":false,"given":"Hidekazu","family":"Muramatsu","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuta","family":"Kainuma","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hiromitsu","family":"Kato","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Norihiko","family":"Sakamoto","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tatsuji","family":"Yamada","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chiharu","family":"Urano","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hiroshi","family":"Abe","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shinobu","family":"Onoda","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Takeshi","family":"Ohshima","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuji","family":"Hatano","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mutsuko","family":"Hatano","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nobu-Hisa","family":"Kaneko","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yasutaka","family":"Amagai","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Takayuki","family":"Iwasaki","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,8,11]]},"reference":[{"key":"58868_CR1","doi-asserted-by":"crossref","unstructured":"Moore, W. 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