Section F: Uncertainty
Efficiency Uncertainty Estimation
The Efficiency Measurement’s Uncertainty is ±0.15%
The reported expanded uncertainty (U) was derived as the product of the combined standard uncertainty (u) and the coverage factor k = 2, corresponding to a confidence interval of approximately 95%. Measurement uncertainty was determined in accordance with JCGM Guide 100:2008, "Guide to the Expression of Uncertainty in Measurements". The estimate of the reported uncertainty pertains to values obtained during the measurements and does not account for possible long-term changes.
Efficiency Measurement Uncertainty Budget
| Source of Uncertainty |
Standard Uncertainty, u(xi) |
Relative Standard Uncertainty, u(xi)/xi |
| Intralab Reproducibility |
0.0310 |
0.00031 |
| Electronic loads Calibration |
0.0500 |
0.00050 |
| Power Analyzer Calibration |
0.0250 |
0.00025 |
| Operator and Test Fixture |
0.0350 |
0.00035 |
| Relative Combined Standard Uncertainty (RSS): |
0.00073 |
| % Expanded Uncertainty U (k=2, norm): |
0.15 |
Noise Output Uncertainty Estimation
The Noise Measurement’s Uncertainty is ±1.23 dBA
The reported expanded uncertainty (U) was derived as the product of the combined standard uncertainty (u) and the coverage factor k = 2, corresponding to a confidence interval of approximately 95%. Measurement uncertainty was determined in accordance with JCGM Guide 100:2008, "Guide to the Expression of Uncertainty in Measurements". The estimate of the reported uncertainty pertains to values obtained during the measurements and does not account for possible long-term changes.
Noise Output Measurement Uncertainty Budget
| Source of Uncertainty |
Standard Uncertainty, u(xi)/xi
(dBA) |
| Intralab Reproducibility |
0.031 |
| Mic Calibrator 4231 calibration |
0.200 |
| Microphone frequency response |
0.577 |
| Temperature |
0.12 |
| Position error |
0.058 |
| Relative Combined Standard Uncertainty (RSS): |
0.61 |
| Expanded Uncertainty U (k=2, norm): |
1.23 |
Conducted Electromagnetic Interference (EMI) Emissions Uncertainty Estimation
The Conducted EMI Emissions Measurement’s Uncertainty is ±1.75 dB
The reported expanded uncertainty (U) was derived as the product of the combined standard uncertainty (u) and the coverage factor k = 2, corresponding to a confidence interval of approximately 95%. Measurement uncertainty was determined in accordance with JCGM Guide 100:2008, "Guide to the Expression of Uncertainty in Measurements". The estimate of the reported uncertainty pertains to values obtained during the measurements and does not account for possible long-term changes.
Conducted EMI Measurement Uncertainty Budget
| Source of Uncertainty |
Standard Uncertainty, u(xi)/xi
(dB) |
| Spectrum Analyzer total measurement uncertainty |
0.250 |
| Spectrum Analyzer calibration |
0.500 |
| Noise and Signal Quality |
0.577 |
| Bandwidth and Resolution Bandwidth (RBW) |
0.289 |
| Measurement time and Averaging |
0.115 |
| Environmental Factors |
0.115 |
| Relative Combined Standard Uncertainty (RSS): |
0.87 |
| Expanded Uncertainty U (k=2, norm): |
1.75 |