Help Thermal Noise Calculator (TNC Calc) is a program that aids in the analysis of thermal noise found in resistors and other noise sources. TNC finds the noise voltage generated by any device if its white noise spectral density and 1/f corner frequency are known. Each parameter can be entered or found. Parameters 1. 2. 3. 4. Noise Voltage, Vn, in μVpp or μVrms White Noise Spectral Density, ND, in nV/Hz Johnson Resistance, R, in Temperature, T, in °C 5. Upper Frequency, Fh, in Hz 6. Lower frequency, Fl, in Hz 7. 1/f Corner Frequency, Fc, in Hz Calculator Window Description Name Value Unit Parameters Consistent Indicator Message Line Command Buttons Commands Alt + F Find the selected parameter Alt + G Graph the noise spectral density curve specified by the parameters Alt + E Export all parameters to a .cvs file Alt + I Import all parameters from a .cvs file Alt + D Load the default startup parameter values Alt + H Display the help page Alt +C Close the calculator “Consistent” indicates that all parameters are consistent. It appears following a Find (Alt + F) command. “Inconsistent” indicates that all parameters may not be consistent. It appears following an entry or import command. Noise Density Curve with Parameters +4σ Gaussian Noise Distribution Vn pp 6.6 Vnrms VnRMS -4σ -3.3σ -3σ -2σ -σ μ Noise Voltage Density +σ VnPP +2σ +3σ +3.3σ About Version 1.1.0 March 1, 2015 Author: Steve Edwards Ported to Python by Matthew Fortin t The probability of exceeding ±3.3σ is 0.001, thus 6.6·Vrms is the peak to peak amplitude that will occur 0.1 % of the time.