
AC and DC characterisation are methods of measuring the electrical properties of a device or circuit. AC characterisation involves applying an alternating current (AC) signal and observing the response in terms of voltage, current, impedance, frequency, and other parameters. DC characterisation involves applying a direct current (DC) signal and observing the response in terms of resistance, power, efficiency, and other factors. Both methods are essential for understanding the performance and limitations of electronic devices and circuits, as the electrical properties often dictate whether the device is performing as expected. This is particularly important for electrical devices, MEMS, and solar cells, where a range of techniques is used to understand different aspects of these properties.