If the temperature is below setpoint, the output will be on longer; if the temperature is too high, the output will be off longer. The third controller type provides proportional with integral and derivative control, or PID.
Noise figure. Noise figure (NF) and noise factor (F) are measures of degradation of the signal-to-noise ratio (SNR), caused by components in a radio-frequency (RF) signal chain. It is a number by which the performance of an amplifier or a radio receiver can be specified, with lower values indicating better performance.
FRA developed a MS Excel spreadsheet model as a tool to assess noise impacts from train horns in the vicinity of highway-rail grade crossings. The model predicts noise levels to the side of the railway and the anticipated effects using FRA noise impact criteria.