Measurement Uncertainty: temperature_rtd_pt100
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| temperature_rtd_pt100 | calibration | 95 | 2 | normal | 2 | 0.1 | degC | Class A Pt100 RTD calibration; IEC 60751 Class A tolerance: +/-(0.15+0.002|T|)C; cal uncertainty at 100C ~ 0.10C expanded; better than thermocouple | degC | 0.05 | Type_B |
| temperature_rtd_pt100 | combined_standard_uncertainty | 95 | 2 | normal | 1 | 0.13 | degC | RSS: sqrt(0.05^2+0.03^2+0.02^2+0.02^2) = 0.064C; U95 = 0.13C; RTD roughly 10x more accurate than Type K thermocouple for same temperature range | degC | 0.065 | Combined |
| temperature_rtd_pt100 | lead_resistance | 95 | 2 | normal | 2 | 0.04 | degC | 4-wire RTD lead resistance effect is eliminated; 3-wire: mismatch of lead resistances contributes ~ 0.01-0.05 ohm = 0.025-0.13C; 4-wire connection assumed here | degC | 0.02 | Type_B |
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