To begin the design process, a few parameters must be decided upon. The designer must know the following:
- Output range of the potential transformers (elements labeled PT in Figure 8-1)
- Output range of the current transformers (elements labeled CT in Figure 8-1)
- Input impedance required from the analog front-end for each channel
- Fundamental frequency of the power system
- Number of harmonics that must be acquired
- Type of signal conditioning required from the analog front-end for each channel