To calibrate the voltage and current readings, perform the following steps:
- Connect the GUI to view results for voltage, current, active power, and the other metering parameters.
- Configure the test source to supply the desired voltage and current for all phases. Make sure that these are the voltage and current calibration points with a zero-degree phase shift between each phase voltage and current. For example, for 120V, 10A, 0° (PF = 1). Typically, these values are the same for every phase.
- Click on the Manual cal. button as illustrated in Figure 4-4.
The screen in Figure 4-5 pops up:
- Calculate the correction values for each voltage and current. The correction values that must be entered for the voltage and current fields are calculated using Equation 15.
Equation 15.
where
- valueobserved is the value measured by the TI meter
- valuedesired is the calibration point configured in the AC test source