Perhaps, you mean DTA... DSC measures the heat flow in Watts, which is J/s, i.e., no conversion needed.
DTA is supposed to measure the difference in T, so the signal is supposed to be in K or C. Yet, sometimes it is cast in Volts. You can convert such signal to Joules via calibration, e.g., by using your instrument to measure the heat of melting for a compound with a known value of the heat of melting. For example, for Indium it is 28.52J/g. Comparing this number against the integral of the respective peak in V will give you the conversion factor.
To make this conversion you need to calibrate with standard materials. I believe the most common is to use the melting enthalpies of different (pure) metals. You need to follow the instructions for the equipment you are using, as the procedure varies depending on the brand.
To convert DSC (Differential Scanning Calorimetry) results from microvolt to joule, you will need to know the heat capacity of the sample and the mass of the sample. The heat capacity is typically reported in units of J/g x K (joules per gram per Kelvin), and the mass is reported in grams. Once you have this information, you can use the following formula to convert the DSC results from microvolt to joule: Joules = (microvolts x heat capacity x mass) / 10^6Where:
Joules are the result of joules
Microvolts is the DSC result in microvolts
Heat capacity is the heat capacity of the sample in J/g*K
Mass is the mass of the sample in grams
10^6 is a conversion factor to convert microvolts to volts
For example, if you have a DSC result of 100 microvolts, a heat capacity of 2 J/g*K, and a sample mass of 0.1 grams, the calculation would be: Joules = (100 * 2 * 0.1) / 10^6 Joules = 0.00002 JTherefore, the DSC result of 100 microvolts is equivalent to 0.00002 joules.