Note:
This section is an example for one
phase. Repeat these steps for the other two phases.
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:
- 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.
- Turn on the AC test source.
- 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.
- Obtain the % error in measurement
from the reference meter. A negative value is possible here.
- 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.
- Click the Update meter
button and the error values on the reference meter immediately settle to a value
close to zero.