METRIC FLIGHT / TOOL 04 / MEASUREMENT
VISUAL LABORATORY · EDITION 10Make the uncertainty
part of the picture.
Explore which assumptions control the proposed mirror measurement—and why more readings alone may not be enough.
PLANNING ALLOCATIONS / NOT MEASURED PERFORMANCE
- Ideal mirror force
- 13.3426 nN
- Expanded uncertainty, k = 2
- 1.6264 nN
- Relative expanded uncertainty
- 12.19 %
Includes inputs, units, assumptions and model version. Calculations run in your browser.
WHAT THE MODEL ASSUMES
More samples cannot
erase every uncertainty.
The optical and calibration allocations are 3% and 5% of force. Electrical, gas and mechanical allocations are 0.08 nN each. The default thermal allocation is 0.15 nN. Statistical uncertainty is the stated per-block standard deviation divided by √N, assuming independent, settled blocks.
U = 2 √[Σ uᵢ² + 2ρ uthermal umechanical]
Changing the sliders explores a design budget; it does not qualify an apparatus or revise the commissioning protocol. Correlated drift can invalidate √N improvement. A coverage factor of 2 is not automatically an exact 95% confidence interval. The current written protocol remains Draft 08.
A material model is a starting point. A prediction earns confidence through measurement, controls and independent review.