Measurement Uncertainty: force_load_cell
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| force_load_cell | calibration | 95 | 2 | normal | 2 | 0.1 | pct_FS | Load cell calibration at accredited lab using Class E2 or F1 deadweights; ISO 376 Class 00/0: U = 0.05% FS; Class 1: 0.2%; Class 2: 0.5% | pct_FS | 0.05 | Type_B |
| force_load_cell | combined_standard_uncertainty | 95 | 2 | normal | 1 | 0.12 | pct_FS | RSS: sqrt(0.05^2+0.03^2+0.02^2+0.01^2) = 0.061% FS; U95 = 0.12% FS for precision load cell; corresponds to ISO 376 Class 1 level | pct_FS | 0.06 | Combined |
| force_load_cell | hysteresis | 95 | 2 | rectangular | 1.732 | 0.04 | pct_FS | Hysteresis: difference between increasing and decreasing loading; precision load cell <0.05% FS; standard uncertainty 0.02% FS | pct_FS | 0.02 | Type_B |
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