Is Input to a Thermocouple a Step or Ramp?

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The input to a thermocouple is debated as either a step or ramp function based on its thermal response. When immersed in a water bath, an instantaneous temperature change is considered a step input. However, due to the thermocouple's thermal mass, it takes time to settle, suggesting a ramp-like behavior. The discussion highlights the importance of understanding the time constant of thermal changes in this context. Ultimately, the thermocouple's response is a complex interplay between immediate voltage generation and gradual thermal adjustment.
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Is input to a thermocouple a step or ramp?
 
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Can you rephrase your question or give more details?
The input is a temperature. A thermocouple generates a very small voltage that is proportional to voltage.
http://en.wikipedia.org/wiki/Thermocouple
 
a thermocouple is a single capacity system..so when immersed in water bath what would be the input to the thermocouple at that instant...is thAT a ramp input or step input??
 
An instant change must be a step. A thermocouple has thermal mass so it will take time to exponentially settle towards a final value. That is closer to a ramp than a step. What is the time constant of the thermal change?
 

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