Measurement Uncertainty: electrical_power_analyzer
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| electrical_power_analyzer | combined_standard_uncertainty | 95 | 2 | normal | 1 | 0.6 | pct_rdg | RSS: sqrt(0.2^2+0.1^2+0.2^2) = 0.30% reading; U95 = 0.6% reading for three-phase power measurement | pct_rdg | 0.3 | Combined |
| electrical_power_analyzer | current_transformer | 95 | 2 | normal | 2 | 0.4 | pct_rdg | CT accuracy class 0.2S for revenue-grade metering; class 1 for industrial; standard uncertainty 0.2% of reading at rated current | pct_rdg | 0.2 | Type_B |
| electrical_power_analyzer | phase_angle_error | 95 | 2 | normal | 2 | 0.4 | pct_power | Phase displacement in CT/VT introduces power factor error: at PF=0.5 phase error of 0.1 degree causes 0.35% power error; standard uncertainty 0.2% | pct_power | 0.2 | Type_B |
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