Stability Study of ac Voltage Source using Josephson Voltage Standards
Bibliographic record
Abstract
The stability of an ac voltage source fabricated at the National Research Council Canada (NRC) is investigated. In this work, differential sampling was used to monitor the source voltage with respect to a step-wise approximated reference waveform generated by the Programmable Josephson Voltage Standard (PJVS) at 4 V and at 1 V. The frequency dependence of the source error is extracted, and the same measurements are repeated 13.5 months later to determine the long-term stability. Different digitizers are used to evaluate input filter effects. The NRC ac voltage source is found to be a suitable travelling standard with a stability of < 4 µV/V per year. At the National Institute of Standards and Technology (NIST), differential sampling was used to monitor the difference between a Josephson Arbitrary Waveform Synthesizer (JAWS) at 1 V and this source. Information is obtained about the effect of relative humidity on the source phase.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.003 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".