After performing gain correction for voltage and current, complete gain correction for active power. Gain correction for active power is done differently in comparison to voltage and current. Although, conceptually, calculating the active energy % error as is done with voltage and power can be done, avoid using this method because the method is not the most accurate.

The best option to get the Correction (%) is directly from the reference meters measurement error of the active power. This error is obtained by feeding energy pulses to the reference meter. To perform active power calibration, complete the following steps:

1. Turn off the system and connect the energy pulse output of the system to the reference meter. Configure the reference meter to measure the active power error based on these pulse inputs.
2. Turn on the AC test source.
3. Repeat step 1 to step 3 from Voltage and Current Gain Calibration with the identical voltages, currents, and 0° phase shift that were used in the same section.
4. Obtain the % error in measurement from the reference meter. A negative value is possible here.
5. Enter the error obtained in step 4 into the Active Power field under the corresponding phase in the GUI window. This error is already the value and does not require calculation.
6. Click the Update meter button and the error values on the reference meter immediately settle to a value close to zero.