Public evidence

units.rf.dbm_watts

Machine-checked verification for calculation version 1.3.1 · tier internally_reviewed

Open calculator API Capability Download JSON CVP Manifest MCP Review policy

CVP status

RF power unit conversion (dBm ↔ W and dBm ↔ mW). Not a dBW / dBµV converter.

Declared partition coverage: PASS · 5/5 declared partitions (dbm-w, w-dbm, dbm-mw, mw-dbm, invalid-domain)
Versions: Calculation 1.3.1 · CVP protocol 1.0.0-proposed · Evidence 2026-09-13.overflow-ssr-rollout
Verification revision: 2026-09-13.overflow-ssr-rollout · 2/2 property · digest 250f2cc95400

Verification

Legacy regression suite: 22/22 calculation tests · Production surface contract 6/6

Three distinct suites: educational examples on the calculator page, this legacy regression count (22/22 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 1.3.1 matches · Semantic contract ✓ · Production attested · Public/cache ✓ · Origin ✓

CVP verification suite

Protocol checks from the Evidence Manifest. Distinct from the legacy regression suite above. Verification revision 2026-09-13.overflow-ssr-rollout. Calculation version 1.3.1. CVP 1.0.0-proposed. 6/6 golden · 8/8 CVP boundary · 14/14 invalid · 2/2 property · 4/4 metamorphic · 4/4 round-trip · 10/10 cross-interface · 4/4 CVP contract. digest 250f2cc95400.

Golden (oracle-backed) 6 / 6
CVP boundary 8 / 8
Invalid input 14 / 14
Property 2 / 2
Metamorphic 4 / 4
Round-trip 4 / 4
Cross-interface 10 / 10
CVP contract 4 / 4
Interfaces PASS · UI (SSR) / REST / MCP
Interface claim ui-ssr is query-result HTML, not a live browser session. Error-path engine·REST·MCP 5/5 (status, code, calculation_version). SSR compared on URL-canonical requested calculations; empty query is idle (not an error) and JSON-typed object/array inputs are REST/MCP-only. Public share URLs use UI alias `a` plus `mode`. Canonical Agent/API field is `value`; mode defaults to dbm-w.
Assurance Engineering

release artifacts aligned PASS
schema output required declared PASS
schema valid input executes PASS
engine success output validates schema PASS
schema rejects incomplete input PASS
rest success payload validates schema PASS

Fingerprint sha256:70149db348a403e63c9b97ad4beab414c61eaf2afd8f6a75b247bc1cd5c5ca9c

Input schema sha256:5c5082367485b8e59088bb08713c44d492dd090fe1de3b0106d7d9e0f24a0864 · Output schema sha256:70209a1ef3a4b1bd56a1e3ccd63ca6fd22bbbe5c4076cda21fff1bade4645a74 · 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: dbm-watt
Engine: dbm-watt
Engine build: 2026-09-13
Evidence core: 2026-09-13T01:52:28.084Z
Rendered: 2026-11-10T05:18:41.762Z
Last reviewed: 2026-09-13

Limitations

W/mW must be >0 for reverse log
Hard INVALID_MODE
IEEE-754 binary64 overflow → NUMERIC_OVERFLOW
IEEE-754 binary64 underflow to 0 → NUMERIC_UNDERFLOW

Sources

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

NIST Technical Note 1850 — Appendix B — dBm ↔ milliwatt
Supports: P_mW = 10^(dBm/10); dBm = 10 log10(P_mW)
ITU / RF practice — dBm — 0 dBm = 1 mW
Supports: Log power ratio definition relative to 1 mW

Verification disclosure

Aggregate outcomes, scope and artifact commitments are public. Complete test inputs, expected values, execution records and oracle infrastructure are retained privately. This summary does not independently reproduce the full verification run.