Temperature controlled measurement system for precise characterization of electronic circuits and devices

A temperature controlled oven, with provisions for easy connection of instruments to the device under test, was designed and built. This paper describes the oven, its thermal model and control system and presents measurement results with different temperature profiles. An NTC thermistor measures the system temperature and a modified Steinhart & Hart equation is used to convert resistance readings to temperature. The system is capable of setting its temperature from just over ambient temperature up to 375K (around 102 °C). Temperature stability is ultimately limited by the resolution of temperature measurement to ±2mK.