CDWORKS / ENGINEERING WORKBENCH

Check the stated tolerance.

Beta Calibration v1.1 · Review assumptions before use.

Turn an instrument's percent-of-full-scale accuracy specification into an absolute allowance and limits at each reference point.

Full-scale accuracy → reading limits

Use the instrument manufacturer's full-scale convention. Span and upper-range magnitude differ on offset and bipolar ranges.

DIRECT TOLERANCE COMPARISON

Instrument lower rangeInstrument upper rangeAccuracy (± percent)Unit label (all values)

Unit label only: editing it does not convert numbers. Enter all range limits, reference values, actual readings and full-scale magnitude in one consistent unit. Convert the source data first. For temperature, absolute values and error differences convert differently: 1 °C error = 1.8 °F error, with no 32-degree offset.

Specification basisManufacturer full-scale magnitude

Drag a reference value on its scale, use arrow keys, or type an exact numeric value. Scale endpoints follow the instrument range. Out-of-range typed values remain visible and are flagged; they are not silently clamped. Unit text is a label and does not convert values.

Reference / nominal + draggable scale	Actual reading (optional)	Edit

Derivation, conventions & limits

Absolute allowance = accuracy percent ÷ 100 × selected basis. Lower reading limit = reference − allowance. Upper reading limit = reference + allowance. Signed error = actual reading − reference. Direct comparison includes the endpoints and uses unrounded values.

Full-scale magnitude is entered explicitly from the manufacturer specification. Span = instrument upper − instrument lower. For −10 to +10 V at ±1%, a manufacturer full-scale magnitude of 10 V gives ±0.1 V; span 20 V gives ±0.2 V. Neither convention should be assumed from the range alone. The bipolar example deliberately requires you to choose a basis.

Only a simple, constant percent-of-selected-basis specification is supported. Percent of reading, additive counts/digits, combined or split specifications, temperature coefficients and other manufacturer conditions need separate treatment.

This calculator is a direct tolerance comparison. It provides no calibration certification, traceability, reference uncertainty evaluation, uncertainty budget or conformance guard band. Test points outside the instrument range are flagged and not compared. Limits are not clipped to the instrument range.

Manufacturer guidance: Fluke: full scale versus span on bipolar ranges · AMETEK: full scale versus reading · Beamex: full scale, span and specification components.

Local data is specific to this browser and Site origin. Export JSON for records you need to keep. Displayed values are rounded to 8 decimal places (scientific notation for smaller values); calculations use unrounded inputs.