{"paper":{"title":"Design and Verification of a New Current Source for Tsinghua Tabletop Kibble Balance","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"A coarse-fine dual-DAC current source reaches 1 nA/A stability in three minutes for tabletop Kibble balances","cross_cats":[],"primary_cat":"physics.ins-det","authors_text":"Kang Ma, Lisha Peng, Shisong Li, Songling Huang, Wei Zhao, Yuhan Ma","submitted_at":"2026-05-16T06:33:36Z","abstract_excerpt":"This paper presents an ultra-stable current source tailored for the one-mode, two-phase (OMTP) measurement scheme in Tsinghua tabletop Kibble balances. To achieve simultaneous high resolution and nA/A-level stability, a composite 'coarse-fine' control topology is proposed, utilizing a dual-DAC architecture and an active digital feedback loop. Experimental results show that the Allan deviation reaches 1 nA/A at an integration time of approximately 3 minutes, representing a tenfold improvement in measurement speed compared to commercial-source-based setups. Furthermore, the design offers a signi"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"Experimental results show that the Allan deviation reaches 1 nA/A at an integration time of approximately 3 minutes, representing a tenfold improvement in measurement speed compared to commercial-source-based setups.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The assumption that the observed Allan deviation improvement is attributable to the proposed coarse-fine dual-DAC topology with active digital feedback rather than to unstated environmental controls, specific load conditions, or post-processing choices in the OMTP scheme.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"A composite coarse-fine current source achieves 1 nA/A Allan deviation at 3-minute integration for Tsinghua tabletop Kibble balance, offering tenfold faster measurements than commercial sources.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"A coarse-fine dual-DAC current source reaches 1 nA/A stability in three minutes for tabletop Kibble balances","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"9adad26c1a7c31f8f2d17fe11f5109d7f3e47f60fbf31344937c0c2d1bcca030"},"source":{"id":"2605.16833","kind":"arxiv","version":1},"verdict":{"id":"381f4faa-4bee-421b-afd0-34e3735eea12","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-19T19:37:41.051465Z","strongest_claim":"Experimental results show that the Allan deviation reaches 1 nA/A at an integration time of approximately 3 minutes, representing a tenfold improvement in measurement speed compared to commercial-source-based setups.","one_line_summary":"A composite coarse-fine current source achieves 1 nA/A Allan deviation at 3-minute integration for Tsinghua tabletop Kibble balance, offering tenfold faster measurements than commercial sources.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The assumption that the observed Allan deviation improvement is attributable to the proposed coarse-fine dual-DAC topology with active digital feedback rather than to unstated environmental controls, specific load conditions, or post-processing choices in the OMTP scheme.","pith_extraction_headline":"A coarse-fine dual-DAC current source reaches 1 nA/A stability in three minutes for tabletop Kibble balances"},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2605.16833/integrity.json","findings":[],"available":true,"detectors_run":[{"name":"doi_title_agreement","ran_at":"2026-05-19T20:01:19.016883Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"doi_compliance","ran_at":"2026-05-19T19:50:42.632890Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"claim_evidence","ran_at":"2026-05-19T19:01:56.255838Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"ai_meta_artifact","ran_at":"2026-05-19T18:33:26.399590Z","status":"skipped","version":"1.0.0","findings_count":0}],"snapshot_sha256":"f398762a05529671dc132238e8f2380ec9ba0b3ebd97b72afab5dbd3ffde9010"},"references":{"count":5,"sample":[{"doi":"","year":2025,"title":"Precision control of resistive power in kibble balance coils: an advanced method for minimizing temperature- related magnetic errors,","work_id":"10849826-5eae-4033-b22c-07e327999b56","ref_index":1,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2025,"title":"Updates on the tsinghua tabletop kibble balance,","work_id":"fbf9137a-8c0a-482d-8e99-0e2ed994224d","ref_index":2,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2023,"title":"Design of the tsinghua tabletop kibble balance,","work_id":"22a8397b-b3e4-4e3c-af44-28c1d1cc21ef","ref_index":3,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2017,"title":"A permanent magnet system for kibble balances,","work_id":"2ff15d82-07e2-4672-a460-dfbbd076e991","ref_index":4,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2024,"title":"A bi-polar current source with high short-term stability for tsinghua tabletop kibble balance,","work_id":"0696b65d-04f5-4485-ba79-bf8acfb3f0da","ref_index":5,"cited_arxiv_id":"","is_internal_anchor":false}],"resolved_work":5,"snapshot_sha256":"d560df1088536811548a7a255aae06417df213bf3fa24f68817d37b2d21f00fd","internal_anchors":0},"formal_canon":{"evidence_count":1,"snapshot_sha256":"f9be757637a25c6d2f07bd3b88c07a5fd9dfa3cdf6ce1cde5f9fb11ff59096c2"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}