Translate one explicitly ordered four-band resistor marking, preserve its source and orientation, and optionally compare a complete measured resistance interval without identifying or approving the component.
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A quick decision brief for this specific tool
Inputs that matter
One de-identified four-band observation record; record name/revision/observation date; one component context; exact marking source; responsible reviewer/review timestamp/retention record; physical, manufacturer-transcription or training basis; explicit first-to-last orientation basis; one-component/four-band, user-recorded-source, arithmetic-only and separate-safety boundaries; ordered first digit, second digit, multiplier and explicit tolerance colours; plus an optional all-or-none measured resistance lower/upper interval, Ω/kΩ/MΩ unit, measurement date, source and conditions
Output to expect
Exact ordered four-colour code, two-digit significant integer and multiplier exponent, nominal resistance in ohms with SI-prefixed display, marked tolerance percentage and nominal interval, plus optional normalized measured interval relation, inclusive overlap or gap and signed lower/upper/midpoint differences
How it works
Validate one explicit four-band scope and accountable provenance; reject unresolved orientation, leading black and unsupported digit/multiplier/tolerance colours; reuse the current IEC-aware two-digit and multiplier mapping; calculate the marked interval as R × (1 ± tolerance%); normalize an optional complete measurement tuple to ohms; classify below, touching/overlap or above without turning the relation into conformance; and preserve seven nondecision flags in versioned Project outputs
Confirm one physical component or exact product record, first-to-last direction, four visible colours and the applicable manufacturer marking convention. A zero-ohm link, non-resistor marking, ambiguous spacing, faded colour, mixed components or special product-specific marking needs another source or workflow.
If comparing measurement evidence, confirm instrument/method record, connection state, de-energized and stored-energy basis, temperature, lead/parallel-path treatment, date, units and uncertainty context all match. An interval overlap is not calibration, measurement validity, prescribed-value compliance, condition or drift acceptance.
Use the result only for marking translation and evidence comparison. It does not identify or select a component; establish technology, datasheet, power, voltage, pulse, frequency or thermal ratings; infer E-series membership or availability; approve a design or repair; diagnose failure; or authorize purchase, energizing, probing, installation or electrical work.
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Built around the job you need to finish
Translate one explicitly ordered four-band resistor marking into exact nominal resistance and marked tolerance interval, optionally compare one independently sourced measured interval, and refuse every identity, rating, selection, conformance, condition, circuit and electrical-work decision.
Electronics repair technician documenting one loose resistor
Resolve and retain the exact first-to-last four-band transcription without treating a familiar color pattern as proof of the part or its suitability.
Identify one de-identified component context and marking source, record how orientation was established, select all four text-backed colors, calculate the nominal interval and retain the reviewed snapshot.
Can reproduce the color arithmetic while product identity, technology, ratings, condition, replacement choice, circuit diagnosis and safe work stay with accountable external records.
Quality reviewer reconciling a marking with an independent measurement
Compare a complete source-owned measured resistance interval against the marked nominal interval without turning overlap into compliance or acceptance.
Freeze the exact component/lot context, marking and orientation evidence, add both measured endpoints with unit/date/instrument-method source/conditions, then inspect relation, overlap or gap and signed differences.
Sees transparent normalized comparison evidence while calibration, uncertainty, prescribed-value testing, drift, condition and disposition remain external.
Demonstrate digits, multiplier and tolerance without relying on color perception alone or presenting a simplified decoder as a circuit-design recipe.
Load the de-identified example, use color-name and numeric-meaning labels, trigger direction/color/partial-measurement errors, inspect the exact steps and review the Decision Boundary.
Learners can reproduce Brown–Black–Red–Gold and low-ohm cases and explain why identification, E-series choice, ratings, measurement and electrical safety need separate evidence.
Authoritative checks for this tool
Outputs and checklists are planning aids. Review the linked current authorities and the records, terms, instructions, and requirements that apply to your exact situation before a consequential decision.
Identify one component or exact manufacturer record, retain the marking source and responsible review, and state how the first-to-last direction was established. The workflow rejects unresolved orientation instead of guessing from color or spacing.
Translate Digits, Multiplier, and Tolerance
The first two colors form a two-digit integer, the third supplies the IEC-style decimal multiplier, and the fourth supplies an explicit tolerance. Nominal resistance and the marked interval are reported in exact ohms with readable SI-prefixed values.
A complete independently sourced interval can be normalized from Ω, kΩ, or MΩ and classified below, touching or overlapping, or above the marked interval. Overlap, gaps, and signed differences are arithmetic evidence—not calibration, conformance, condition, or suitability decisions.
Updated: September 2026
Example Scenarios
Record the visible order and four color names before consulting the exact product, circuit, service, rating, replacement, and safety records.
Compare a source-owned measured interval against the translated marking while keeping instrument method, calibration, uncertainty, prescribed-value testing, and disposition outside the Tool.
Use color names, digit or multiplier meanings, exact calculation steps, and explicit refusal boundaries so learners do not depend on color perception alone or mistake decoding for circuit design.
Common Mistakes to Avoid
✕
Guessing the reading direction or a faded color
✓
Stop when orientation or any band is ambiguous. Retain the physical observation or exact manufacturer evidence that establishes first-to-last order and each color.
✕
Treating interval overlap as component approval
✓
Overlap only describes two entered intervals. It does not validate the meter, calibration, uncertainty, component identity, ratings, condition, drift, conformance, circuit suitability, repair, or safe work.
FAQ
It combines two significant digits with the selected decimal multiplier, then applies the explicit tolerance-band percentage to produce a nominal interval. Accuracy still depends on the user-recorded order and colors.
IEC 60062 covers resistor and capacitor marking codes, including resistor value and tolerance colors and the pink 10^-3 multiplier. The exact product record must still confirm which standardized options apply.
No. A color marking does not establish technology, manufacturer, part number, power, voltage, pulse, frequency, thermal rating, E-series membership, availability, condition, or circuit suitability.
Enter both interval endpoints, the Ω/kΩ/MΩ unit, date, instrument or method source, and source-owned conditions. Equal endpoints can represent one reported value; incomplete evidence is rejected.
No. The Tool only compares entered intervals. Measurement validity, uncertainty, prescribed-value compliance, drift, condition, disposition, design acceptance, and electrical safety require separate accountable procedures and reviewers.
About Four-Band Resistor Observation Record
Create one accountable four-band marking record: preserve the observation and orientation, translate the exact color arithmetic, and optionally compare complete measurement evidence while leaving every component and electrical-work decision outside the Tool.
