... . ER9 power recorder is used to measure and record true value of 3 phase voltage , ampere , active power , reactive power , power factor ... , Kwh , KvarH ect. It also can generates all kinds of forms .2. Datasheet record can be passed to PC to ... factor , frequency , Kwh , KvarH ect3. Total active power value and total reactive power value accumulation memory function.4. Switch output: 2 loop ...