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.
A noise reduction coefficient (NRC) is a single number that represents an average of the sound absorption coefficients in the 250 Hz, 500 Hz, 1000 Hz, and 2000 Hz octave bands. Detail of its calculation can be found in the ASTM C-423 standard.