This overload detection system is used to detect when a user applies a voltage that is too high to an oscilloscope so that the internal relays can be switched off to prevent damage. This ECE Senior Design Capstone project is a prototype for a circuit that is intended for use in Tektronix oscilloscopes. A key technology used is temperature sensing, which is done using thermistors that are thermally coupled to the oscilloscope input trace, to detect the overloads. Temperature sensing us used since directly measuring the voltage would introduce noise. Additionally, this project is done in hardware only, with no embedded programming, in order to improve detection speed. The primary accomplishment of this project is a working prototype that was tested in a temperature controlled chamber from 0 to 50 °C. A major challenge was properly calibrating the temperature sensors to work quickly enough without providing false detections over the temperature range. A future improvement is to increase the speed of the system through better calibrated ramp detection.