Why Does My DSC Baseline Go Below Zero?

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The discussion centers on the issue of a Differential Scanning Calorimeter (DSC) displaying baseline values below zero (negative values). Key points include the possibility of bad calibration affecting the readings, as the absolute number is less significant than the relative change from the initial value set. Another consideration is the potential conversion between polymorphs, which could release energy and result in negative values. Participants also suggest verifying the consistency of results by running the same sample multiple times to see if the negative values persist.
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My baseline for the DSC goes past zero (below 0 W/g) why would the instrument be doing this?
 
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This may be obvious, but: Bad calibration?
 
it goes relative to the initial value you put in. the absolute number does not mean much.
 
Perhaps you converted from one polymorph to another and a little energy was released? Have you run the same sample twice and noticed the negative value again?
 

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