How accurate is the power measurement of the dSM? digitalSTROM Support October 12, 2018 08:37 Updated Follow The specified measurement accuracy is: +/- 5 % (I ≥ 0.02 x I nominal) real power. Related articles How often are the energy readings updated in the dSM? Which digitalSTROM-Server version must be installed? What is the dSS22? Installations in the multimedia distributor What does the dSM measure: Active power or apparent power?