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.
This means that if you are firing a rifle that produces 140 dB and the hearing protection that you have on has an NRR 33 dB, the level of noise exposure is not reduced to 103 dB. To determine how much noise exposure is reduce, deduct 7 from the NRR on the device and divide the result by two.