What is Temperature Hysteresis?

Discussion in 'General Electronics Chat' started by bugserm, Oct 28, 2011.

  1. bugserm

    Thread Starter New Member

    Oct 28, 2011
    Hallo everyone..
    i was reading ADT7310 temperature sensor datasheet & bumped into this term "temperature hysteresis". Does anybony know what that means. thnx alots :)
  2. BillB3857

    Senior Member

    Feb 28, 2009
    Normally, Hysteresis represents an amount of change of one variable needed to cause a change in another. In this case, the hysteresis is documented as 0.02 degrees C. A typical home heating/cooling thermostat has a built in hysteresis of a couple of degrees to prevent the heating/cooling system from short cycling.

    On edit; Analog signals are constantly variable, and if operating an ON/OFF device, or being converted to digital, a certain amount of hysteresis will be present. If an 8 bit A/D converter has a range of 0 to 10v, each bit change in the count would represent a change of 10/255 volt. Any change less than that would be considered hysteresis. At least that is the way I understand it. Others may have differnt thoughts.
    Last edited: Oct 28, 2011
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  3. Wendy


    Mar 24, 2008
    Adding on to what was said, a typical freon air conditioner will be damaged it turned off then turned on too quickly. It isn't good for the heater either. By allowing a typical 2° window this is eliminated.
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