A dead/DEAD BAND band is a range that does not change significantly in the output signal by changing the direction of the input signal.
In the International Dictionary of Measurement (VIM): 2008) The silent band is defined as follows:
“The maximum interval in which the quantity under measurement can be changed in two directions without any apparent change in its corresponding marking.
Hint: The band of silence can depend on the speed of change.”
For example, it can refer to a temperature control system using thermostat. In this system, the heating system starts to function as long as the room temperature is colder than the temperature, and this temperature increase continues to the point that the room temperature exceeds the amount of the thermostat silent band. At that time, the thermostat is disconnected and the heating system is turned off. Then the room begins to cool again and this cycle continues to keep room temperature constant with the range of temperature changes of the thermostat silent band.
Tips: Dead band can be reported as a percentage of input span zone.