{"sections":[{"code":".TEMP 4.2\n.NEB 1GHz\nR1 1 0 50 temp=4.2 neb=1GHz","heading":"Thermal-noise settings","paragraphs":["The maintained syntax uses .TEMP for temperature in kelvin and .NEB for effective noise bandwidth in hertz. Supported devices may override the global settings with temp= and neb=.","Enter a temperature such as 77 kelvin as .TEMP 77. Do not append the engineering suffix K expecting a kelvin unit: in numeric expressions it can mean a factor of one thousand."]},{"heading":"Explicit noise waveform","paragraphs":["NOISE(A [Td [Ts]]) takes a spectral amplitude, start delay and sample time; the documented default sample time is Tstep. This is a separate interface from .TEMP/.NEB.","Keep simulation timestep, noise sampling and measurement/averaging windows explicit when comparing runs. Account for random realisations and settling; a different trace is not alone evidence of changed noise power."]},{"heading":"Avoid a universal conversion formula","paragraphs":["Historical correspondence corrected earlier bandwidth/sample-time advice. This draft intentionally does not supply one conversion between effective thermal bandwidth and an arbitrary explicit sampled-noise source. Verify the intended noise definition and current implementation before quantitative comparisons.","Junction model T/TC parameters can also change device behaviour; that is separate from adding thermal-noise excitation."]}],"canonical_url":"https://www.sun-magnetics.com/knowledge-base/josim-noise-settings","url":"/knowledge-base/josim-noise-settings","known_issues":[],"search_record":{"execution":false,"relatedProducts":[],"version_tags":["JoSIM-Pro 2.9 target"],"text":"Check temperature, noise bandwidth and sample time in JoSIM-Pro Distinguish thermal-noise settings from an explicit NOISE waveform and from temperature-dependent junction model parameters. JoSIM-Pro 2.9.0 release target; review-build/source evidence Troubleshooting Thermal-noise settings The maintained syntax uses .TEMP for temperature in kelvin and .NEB for effective noise bandwidth in hertz. Supported devices may override the global settings with temp= and neb=. Enter a temperature such as 77 kelvin as .TEMP 77. Do not append the engineering suffix K expecting a kelvin unit: in numeric expressions it can mean a factor of one thousand. .TEMP 4.2\n.NEB 1GHz\nR1 1 0 50 temp=4.2 neb=1GHz Explicit noise waveform NOISE(A [Td [Ts]]) takes a spectral amplitude, start delay and sample time; the documented default sample time is Tstep. This is a separate interface from .TEMP/.NEB. Keep simulation timestep, noise sampling and measurement/averaging windows explicit when comparing runs. Account for random realisations and settling; a different trace is not alone evidence of changed noise power.  Avoid a universal conversion formula Historical correspondence corrected earlier bandwidth/sample-time advice. This draft intentionally does not supply one conversion between effective thermal bandwidth and an arbitrary explicit sampled-noise source. Verify the intended noise definition and current implementation before quantitative comparisons. Junction model T/TC parameters can also change device behaviour; that is separate from adding thermal-noise excitation. ","id":"josim-noise-settings","keywords":"","kind":"Troubleshooting","title":"Check temperature, noise bandwidth and sample time in JoSIM-Pro","product":"JoSIM-Pro"},"version":"2.9.0 release target; review-build/source evidence","id":"josim-noise-settings","related":["/knowledge-base/josim-junction-resistance","/knowledge-base/josim-coupling-validity"],"downloads":[],"publication_status":"published","numerical_output":null,"provenance":{"execution_checks":[],"figure_evidence":[],"review_notes":["Temperature suffix and quantitative noise behaviour still need a fresh controlled walkthrough. Historical formula corrections are not numerical validation of this draft.","The owner accepted the modelling explanation on 2 November 2026. Applicable release/platform and unrecorded walkthrough checks remain pending."],"scope":"Recorded inputs/builds only. Complete walkthrough and final-package acceptance remain separate.","verification_requirements":{"gui_method":"not-required-for-this-answer","status":"review-incomplete","illustrations":"not-required-for-this-answer","required":["technical-review","release-applicability","recovery"],"legacy_walkthrough_field":"pending retained; not evidence of a complete scenario"},"sources":[{"id":"support:SUP-014","section":"Generalised editorial finding; outcome qualification retained"},{"id":"support:SUP-015","section":"Generalised editorial finding; outcome qualification retained"},{"id":"josim-pro:docs/manual_source/sections/syntax.tex","section":"Noise; noise settings; Josephson junction parameters"},{"id":"owner:technical-review-20261102","section":"JoSIM-Pro 2.9 chosen as the public starting path; release availability must be checked before publication"}]},"title":"Check temperature, noise bandwidth and sample time in JoSIM®-Pro","type":"Troubleshooting","markdown_url":"/_functions/kbResource?path=markdown%2Fjosim-noise-settings.md","summary":"Distinguish thermal-noise settings from an explicit NOISE waveform and from temperature-dependent junction model parameters.","product":"JoSIM-Pro"}