Public evidence

electrical.wheatstone

Machine-checked verification for calculation version 1.0.0 · tier expert_verified

Open calculator API Capability Download JSON CVP Manifest MCP Review policy

CVP: CVP VERIFIED · CVP protocol 1.0.0-proposed · Engineering assurance· Unloaded midpoints; no gauge-factor conversion · Protocol · Schema · Production report

Declared partition coverage: PASS · 3/3 declared partitions (balanced, unbalanced, invalid-domain)
Versions: Calculation 1.0.0 · CVP protocol 1.0.0-proposed
CVP identity: 2/2 property · digest 6cd8ba54befd

Verification

Legacy regression suite: 6/6 calculation tests · Production surface contract 4/4

Three distinct suites: educational examples on the calculator page, this legacy regression count (6/6 golden + boundary), and the CVP verification suite below. They are not the same number. Property, metamorphic, round-trip, O3, and interface statuses/checks are recorded in the CVP Manifest . SKIP (0/0) means that suite has no published vectors.

This calculator CURRENT · Public schema 1.0.0 matches · Semantic contract ✓ · Production attested · Public/cache ✓ · Origin ✓

CVP verification suite

Protocol checks from the Evidence Manifest. Distinct from the legacy regression suite above. Calculation version 1.0.0. CVP 1.0.0-proposed. 2/2 golden · 2/2 CVP boundary · 2/2 invalid · 2/2 property · 1/1 cross-interface · 1/1 CVP contract. digest 6cd8ba54befd.

Golden (oracle-backed) 2 / 2
CVP boundary 2 / 2
Invalid input 2 / 2
Property 2 / 2
Cross-interface 1 / 1
CVP contract 1 / 1
Interfaces PASS · UI (SSR) / REST / MCP
Interface claim ui-ssr is query-result HTML, not a live browser session.
Assurance Engineering

release artifacts aligned PASS
schema valid input executes PASS
engine success output validates schema PASS
schema rejects incomplete input PASS

Fingerprint sha256:2ba69365674ee6335e3414b1e6057583a588016167836403a31bb6874aef02c4

Input schema sha256:51d643d5bf63db29ae0569e2da47aec8fab741d62b59ae63d58e4e9d599c9183 · Output schema sha256:b7886da7e240b9f203692bcacebd4283501a4b87ce063e40e954f5d6098bcaf5 · Build-time SHA-256 digests prove published artifacts agree with each other (release_integrity.scope=workspace). Production attestation GETs canonical URLs twice (public/cached view and origin), including Capability HTML, via npm run attest:production --write (published at /.well-known/calculatorx-production-attestation.json) and fails if the public Capability page advertises a different calculation_version. This is artifact consistency, not an independent immutable release log.

Build & scope

Engine identity and declared limitations.

Tool: wheatstone-bridge
Engine: wheatstone-bridge
Engine build: 2026-09-10
Evidence core: 2026-09-05T02:35:39.217Z
Rendered: 2026-09-16T22:03:43.722Z
Last reviewed: 2026-08-08

Limitations

Unloaded ideal bridge only

Sources

Standards and references supporting this tool specification. Methods are listed separately — they are algorithms, not bibliographic sources.

IEC 60050 — IEV — Wheatstone bridge
Supports: Four-arm bridge topology
Horowitz & Hill — The Art of Electronics — Bridge circuits
Supports: Divider difference form

Legacy published checks

Golden and boundary cases from the legacy Evidence JSON. CVP property, metamorphic, round-trip, O3, and interface statuses/checks are recorded in the Manifest — including SKIP when a suite has no vectors.

ID	Kind	Status	Detail
`balanced`	golden	pass	Expected Vout=0 · balanced=true · Actual Vin=10 · R1=1000 · R2=1000 · R3=1000 · R4=1000 · Va=5 · Vb=5 · Vout=0
`unbalanced`	golden	pass	Expected Vout=-0.23809523809523814 · Actual Vin=10 · R1=1000 · R2=1000 · R3=1000 · R4=1100 · Va=5 · Vb=5.238095238095238 · Vout=-0.23809523809523814
`missing-R4`	boundary	pass	Expected MISSING_REQUIRED_INPUT · Actual MISSING_REQUIRED_INPUT
`zero-R`	boundary	pass	Expected VALUE_MUST_BE_POSITIVE · Actual VALUE_MUST_BE_POSITIVE
`property-balanced`	property	pass	balanced 0
`property-unbal`	property	pass	unbalanced