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.
Signal to Noise Ratio (S/N) is a dimensionless measure of the relative strength of an analytical. signal (S) to the average strength of the background instrumental noise (N) for a particular sample. and is closely related to the detection level.