Usually in a TGA most of the softwares have an option to get DTG data , one with time-temperature-weight and the other with time-temperature-derivative weight. In the former use temperature in x-axis and weight in y-axis and you can draw your TG curve. To plot DTA curve, select temperature as x-axis and derivative weight (dm/dt) as y-axis. After selecting your data click Insert > Charts > Scatter. Select Scatter with Smooth Lines option and then you can plot your DTG curve.
If your software doesnt have an option to convert your TG signal into DTG, save your data as .txt, then open in MS Excel. Derive your weigt as a function of time of temperature then you can obtain DTG curve.
Based on my understanding, we cannot obtain DTA data solely from TGA, but have to measure it as a separate parameter. The former is about heat flow while the latter is about weight loss. Most of the modern TGA equipment does have DTA accessory. You may consult with your lab technician about this. Hope it helps.
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