In this tutorial, we will see how to calibrate STPM32/33. STPM32 is an ASSP (Application Specific Standard Product) for metering applications. It is designed for measurement of power and energies in a power line with high accuracy. It provides instantaneous voltage and currents, active, reactive and apparent powers, and energies. Lets start with how to Calibrate STPM32/33 For Digital Smart Energy Meter. Introduction To Energy Calibration Calibration is the process of comparing reading on one piece of equipment or system, with another piece of equipment. The other piece of equipment that has been calibrated and referenced to a known set of parameters. After the design phase, any tolerance of the real components from these values or device internal parameter drift can