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.
The Importance of Revenue Variances. The revenue variance for an accounting period is the difference between budgeted and actual revenue. A favorable revenue variance occurs when actual revenues exceed budgeted revenues, while the opposite is true for an unfavorable variance. Revenue variance results from the differences between budgeted and actual selling prices, volumes or a combination of the two.