Measurement Uncertainty: mass_platform_scale
GUM-compliant measurement uncertainty budget components and coverage factors for common engineering measurements. Covers Type A (statistical) and Type B (non-statistical) uncertainty sources with standard uncertainties, expanded uncertainties at k=2 (95%), and confidence levels for: length/dimension (caliper, micrometer, CMM, gauge block), mass (analytical balance, platform scale), temperature (Type K thermocouple, Pt100 RTD, IR pyrometer), pressure (Bourdon gauge, electronic transducer, liquid manometer), flow (orifice plate, turbine meter, Coriolis, ultrasonic transit-time), electrical (DMM, power analyzer), force (load cell), and torque (torque wrench). Also includes coverage factor reference rows (k=1/2/3, 68/95/99.7%) and distribution divisors (rectangular, triangular, normal, U-shaped). Per ISO/IEC Guide 98-3:2008 (GUM), NIST TN 1297, ISO/IEC 17025:2017.
| measurement type | uncertainty source | confidence level pct (%) | coverage factor k | distribution | divisor | expanded uncertainty k2 | expanded uncertainty unit | notes | standard uncertainty unit | standard uncertainty value | uncertainty type |
|---|---|---|---|---|---|---|---|---|---|---|---|
| mass_platform_scale | calibration | 95 | 2 | normal | 2 | 0.2 | g | Calibration uncertainty using Class F1 weights; typical expanded uncertainty U = 0.20 g at k=2 for 30 kg scale; includes eccentricity and span | g | 0.1 | Type_B |
| mass_platform_scale | combined_standard_uncertainty | 95 | 2 | normal | 1 | 0.36 | g | RSS: sqrt(0.15^2+0.10^2+0.05^2) = 0.185 g; U95 = 0.37 g for typical 30 kg platform scale | g | 0.18 | Combined |
| mass_platform_scale | repeatability | 95 | 2 | normal | 1 | 0.1 | g | Type A uncertainty from 10 repeated weighings; sd typically 0.05-0.10 g for 30 kg platform scale | g | 0.05 | Type_A |
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