NFM has been updated to v1.18.0.
It includes for user convenience, a noise measurement uncertainty calculator based on the discussion of uncertainty of the noise sampling process at (Duffy 2007b) and the calculator at (Duffy 2007c)
The fast option uses an inverse square law extrapolation from the value for 1000 samples (2*bandwidth*interval). It is automatically selected from long calculations, automatically deselected for very small sample sizes. It is a compute intensive calculation, and may take some time.
- Duffy, O. 2007. Noise Figure Meter software (NFM). http://owenduffy.net/software/nfm/index.htm (accessed 01/04/2014).
- ———. 2007b. Uncertainty of the noise sampling process. VK1OD.net (offline).
- ———. 2007c. Noise measurement uncertainty calculator. VK1OD.net (offline).