PROJECT 01 · AC POWER ANALYSIS
AC Power Analyzer — three phases, twelve current channels, neutral and earth on one board
Our newest board: a three-phase AC power analyzer with three main phase channels, nine secondary channels — including the neutral and the protective-earth conductor — and an external 3000:1 current transformer on every channel, up to 60 A.
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12current channels: 3 main phase channels + 9 secondary
3line-to-line voltages (L1-L2 · L1-L3 · L2-L3) through voltage transformers
2processors: PIC32MZ measures, ESP32 communicates
3galvanically separated domains: measurement, network, RS-485
A 3000:1 current transformer on every channel, up to 60 A — the burden resistors sit on the underside of the board; every input is on a pluggable 5.08 mm terminal.
Neutral and protective earth have their own channels, next to seven secondary circuits — the full picture of the installation, not just the phases.
Three 24-bit metering ADCs on one shared clock — the hardware basis for sampling every voltage and current together.
PIC32MZ dedicated to measurement, with non-volatile FRAM beside it for data that must survive power cuts.
Network side on ESP32: wired Ethernet with a dedicated PHY, Wi-Fi and a USB service port.
Two galvanically isolated RS-485 ports — one on the network processor, one directly on the measurement processor — with termination set by jumper.
Two power paths for the measurement side: an on-board AC/DC module straight from the mains, and the external DC supply (or USB) that also powers the network side.
Designed for machine assembly: 369 components on a 235 × 100 mm board.